11da177e4SLinus Torvalds #ifndef _LINUX_SCHED_H 21da177e4SLinus Torvalds #define _LINUX_SCHED_H 31da177e4SLinus Torvalds 4b7b3c76aSDavid Woodhouse /* 5b7b3c76aSDavid Woodhouse * cloning flags: 6b7b3c76aSDavid Woodhouse */ 7b7b3c76aSDavid Woodhouse #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ 8b7b3c76aSDavid Woodhouse #define CLONE_VM 0x00000100 /* set if VM shared between processes */ 9b7b3c76aSDavid Woodhouse #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ 10b7b3c76aSDavid Woodhouse #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ 11b7b3c76aSDavid Woodhouse #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ 12b7b3c76aSDavid Woodhouse #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ 13b7b3c76aSDavid Woodhouse #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ 14b7b3c76aSDavid Woodhouse #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ 15b7b3c76aSDavid Woodhouse #define CLONE_THREAD 0x00010000 /* Same thread group? */ 16b7b3c76aSDavid Woodhouse #define CLONE_NEWNS 0x00020000 /* New namespace group? */ 17b7b3c76aSDavid Woodhouse #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ 18b7b3c76aSDavid Woodhouse #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ 19b7b3c76aSDavid Woodhouse #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ 20b7b3c76aSDavid Woodhouse #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ 21b7b3c76aSDavid Woodhouse #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ 22b7b3c76aSDavid Woodhouse #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ 23b7b3c76aSDavid Woodhouse #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ 24b7b3c76aSDavid Woodhouse #define CLONE_STOPPED 0x02000000 /* Start in stopped state */ 25071df104SSerge E. Hallyn #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ 2625b21cb2SKirill Korotaev #define CLONE_NEWIPC 0x08000000 /* New ipcs */ 2777ec739dSSerge E. Hallyn #define CLONE_NEWUSER 0x10000000 /* New user namespace */ 2830e49c26SPavel Emelyanov #define CLONE_NEWPID 0x20000000 /* New pid namespace */ 29169e3674SEric W. Biederman #define CLONE_NEWNET 0x40000000 /* New network namespace */ 30fadad878SJens Axboe #define CLONE_IO 0x80000000 /* Clone io context */ 31b7b3c76aSDavid Woodhouse 32b7b3c76aSDavid Woodhouse /* 33b7b3c76aSDavid Woodhouse * Scheduling policies 34b7b3c76aSDavid Woodhouse */ 35b7b3c76aSDavid Woodhouse #define SCHED_NORMAL 0 36b7b3c76aSDavid Woodhouse #define SCHED_FIFO 1 37b7b3c76aSDavid Woodhouse #define SCHED_RR 2 38b7b3c76aSDavid Woodhouse #define SCHED_BATCH 3 390e6aca43SIngo Molnar /* SCHED_ISO: reserved but not implemented yet */ 400e6aca43SIngo Molnar #define SCHED_IDLE 5 41b7b3c76aSDavid Woodhouse 42a3b6714eSDavid Woodhouse #ifdef __KERNEL__ 43b7b3c76aSDavid Woodhouse 44b7b3c76aSDavid Woodhouse struct sched_param { 45b7b3c76aSDavid Woodhouse int sched_priority; 46b7b3c76aSDavid Woodhouse }; 47b7b3c76aSDavid Woodhouse 481da177e4SLinus Torvalds #include <asm/param.h> /* for HZ */ 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds #include <linux/capability.h> 511da177e4SLinus Torvalds #include <linux/threads.h> 521da177e4SLinus Torvalds #include <linux/kernel.h> 531da177e4SLinus Torvalds #include <linux/types.h> 541da177e4SLinus Torvalds #include <linux/timex.h> 551da177e4SLinus Torvalds #include <linux/jiffies.h> 561da177e4SLinus Torvalds #include <linux/rbtree.h> 571da177e4SLinus Torvalds #include <linux/thread_info.h> 581da177e4SLinus Torvalds #include <linux/cpumask.h> 591da177e4SLinus Torvalds #include <linux/errno.h> 601da177e4SLinus Torvalds #include <linux/nodemask.h> 61c92ff1bdSMartin Schwidefsky #include <linux/mm_types.h> 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds #include <asm/system.h> 641da177e4SLinus Torvalds #include <asm/page.h> 651da177e4SLinus Torvalds #include <asm/ptrace.h> 661da177e4SLinus Torvalds #include <asm/cputime.h> 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds #include <linux/smp.h> 691da177e4SLinus Torvalds #include <linux/sem.h> 701da177e4SLinus Torvalds #include <linux/signal.h> 711da177e4SLinus Torvalds #include <linux/fs_struct.h> 721da177e4SLinus Torvalds #include <linux/compiler.h> 731da177e4SLinus Torvalds #include <linux/completion.h> 741da177e4SLinus Torvalds #include <linux/pid.h> 751da177e4SLinus Torvalds #include <linux/percpu.h> 761da177e4SLinus Torvalds #include <linux/topology.h> 773e26c149SPeter Zijlstra #include <linux/proportions.h> 781da177e4SLinus Torvalds #include <linux/seccomp.h> 79e56d0903SIngo Molnar #include <linux/rcupdate.h> 8023f78d4aSIngo Molnar #include <linux/rtmutex.h> 811da177e4SLinus Torvalds 82a3b6714eSDavid Woodhouse #include <linux/time.h> 83a3b6714eSDavid Woodhouse #include <linux/param.h> 84a3b6714eSDavid Woodhouse #include <linux/resource.h> 85a3b6714eSDavid Woodhouse #include <linux/timer.h> 86a3b6714eSDavid Woodhouse #include <linux/hrtimer.h> 877c3ab738SAndrew Morton #include <linux/task_io_accounting.h> 885cb350baSDhaval Giani #include <linux/kobject.h> 899745512cSArjan van de Ven #include <linux/latencytop.h> 909e2b2dc4SDavid Howells #include <linux/cred.h> 91a3b6714eSDavid Woodhouse 92a3b6714eSDavid Woodhouse #include <asm/processor.h> 9336d57ac4SH. J. Lu 9478fb7466SPavel Emelianov struct mem_cgroup; 951da177e4SLinus Torvalds struct exec_domain; 96c87e2837SIngo Molnar struct futex_pi_state; 97286100a6SAlexey Dobriyan struct robust_list_head; 98d89d8796SNeil Brown struct bio; 99ca0002a1SMarkus Metzger struct bts_tracer; 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds /* 1021da177e4SLinus Torvalds * List of flags we want to share for kernel threads, 1031da177e4SLinus Torvalds * if only because they are not used by them anyway. 1041da177e4SLinus Torvalds */ 1051da177e4SLinus Torvalds #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvalds /* 1081da177e4SLinus Torvalds * These are the constant used to fake the fixed-point load-average 1091da177e4SLinus Torvalds * counting. Some notes: 1101da177e4SLinus Torvalds * - 11 bit fractions expand to 22 bits by the multiplies: this gives 1111da177e4SLinus Torvalds * a load-average precision of 10 bits integer + 11 bits fractional 1121da177e4SLinus Torvalds * - if you want to count load-averages more often, you need more 1131da177e4SLinus Torvalds * precision, or rounding will get you. With 2-second counting freq, 1141da177e4SLinus Torvalds * the EXP_n values would be 1981, 2034 and 2043 if still using only 1151da177e4SLinus Torvalds * 11 bit fractions. 1161da177e4SLinus Torvalds */ 1171da177e4SLinus Torvalds extern unsigned long avenrun[]; /* Load averages */ 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds #define FSHIFT 11 /* nr of bits of precision */ 1201da177e4SLinus Torvalds #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ 1210c2043abSLinus Torvalds #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ 1221da177e4SLinus Torvalds #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ 1231da177e4SLinus Torvalds #define EXP_5 2014 /* 1/exp(5sec/5min) */ 1241da177e4SLinus Torvalds #define EXP_15 2037 /* 1/exp(5sec/15min) */ 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds #define CALC_LOAD(load,exp,n) \ 1271da177e4SLinus Torvalds load *= exp; \ 1281da177e4SLinus Torvalds load += n*(FIXED_1-exp); \ 1291da177e4SLinus Torvalds load >>= FSHIFT; 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds extern unsigned long total_forks; 1321da177e4SLinus Torvalds extern int nr_threads; 1331da177e4SLinus Torvalds DECLARE_PER_CPU(unsigned long, process_counts); 1341da177e4SLinus Torvalds extern int nr_processes(void); 1351da177e4SLinus Torvalds extern unsigned long nr_running(void); 1361da177e4SLinus Torvalds extern unsigned long nr_uninterruptible(void); 137db1b1fefSJack Steiner extern unsigned long nr_active(void); 1381da177e4SLinus Torvalds extern unsigned long nr_iowait(void); 1391da177e4SLinus Torvalds 14043ae34cbSIngo Molnar struct seq_file; 14143ae34cbSIngo Molnar struct cfs_rq; 1424cf86d77SIngo Molnar struct task_group; 14343ae34cbSIngo Molnar #ifdef CONFIG_SCHED_DEBUG 14443ae34cbSIngo Molnar extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); 14543ae34cbSIngo Molnar extern void proc_sched_set_task(struct task_struct *p); 14643ae34cbSIngo Molnar extern void 1475cef9ecaSIngo Molnar print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); 14843ae34cbSIngo Molnar #else 14943ae34cbSIngo Molnar static inline void 15043ae34cbSIngo Molnar proc_sched_show_task(struct task_struct *p, struct seq_file *m) 15143ae34cbSIngo Molnar { 15243ae34cbSIngo Molnar } 15343ae34cbSIngo Molnar static inline void proc_sched_set_task(struct task_struct *p) 15443ae34cbSIngo Molnar { 15543ae34cbSIngo Molnar } 15643ae34cbSIngo Molnar static inline void 1575cef9ecaSIngo Molnar print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) 15843ae34cbSIngo Molnar { 15943ae34cbSIngo Molnar } 16043ae34cbSIngo Molnar #endif 1611da177e4SLinus Torvalds 162690229a0SIngo Molnar extern unsigned long long time_sync_thresh; 163690229a0SIngo Molnar 1644a8342d2SLinus Torvalds /* 1654a8342d2SLinus Torvalds * Task state bitmask. NOTE! These bits are also 1664a8342d2SLinus Torvalds * encoded in fs/proc/array.c: get_task_state(). 1674a8342d2SLinus Torvalds * 1684a8342d2SLinus Torvalds * We have two separate sets of flags: task->state 1694a8342d2SLinus Torvalds * is about runnability, while task->exit_state are 1704a8342d2SLinus Torvalds * about the task exiting. Confusing, but this way 1714a8342d2SLinus Torvalds * modifying one set can't modify the other one by 1724a8342d2SLinus Torvalds * mistake. 1734a8342d2SLinus Torvalds */ 1741da177e4SLinus Torvalds #define TASK_RUNNING 0 1751da177e4SLinus Torvalds #define TASK_INTERRUPTIBLE 1 1761da177e4SLinus Torvalds #define TASK_UNINTERRUPTIBLE 2 177f021a3c2SMatthew Wilcox #define __TASK_STOPPED 4 178f021a3c2SMatthew Wilcox #define __TASK_TRACED 8 1794a8342d2SLinus Torvalds /* in tsk->exit_state */ 1804a8342d2SLinus Torvalds #define EXIT_ZOMBIE 16 1814a8342d2SLinus Torvalds #define EXIT_DEAD 32 1824a8342d2SLinus Torvalds /* in tsk->state again */ 183af927232SMike Galbraith #define TASK_DEAD 64 184f021a3c2SMatthew Wilcox #define TASK_WAKEKILL 128 185f021a3c2SMatthew Wilcox 186f021a3c2SMatthew Wilcox /* Convenience macros for the sake of set_task_state */ 187f021a3c2SMatthew Wilcox #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) 188f021a3c2SMatthew Wilcox #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) 189f021a3c2SMatthew Wilcox #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) 1901da177e4SLinus Torvalds 19192a1f4bcSMatthew Wilcox /* Convenience macros for the sake of wake_up */ 19292a1f4bcSMatthew Wilcox #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) 193f021a3c2SMatthew Wilcox #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) 19492a1f4bcSMatthew Wilcox 19592a1f4bcSMatthew Wilcox /* get_task_state() */ 19692a1f4bcSMatthew Wilcox #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ 197f021a3c2SMatthew Wilcox TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ 198f021a3c2SMatthew Wilcox __TASK_TRACED) 19992a1f4bcSMatthew Wilcox 200f021a3c2SMatthew Wilcox #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) 201f021a3c2SMatthew Wilcox #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) 20292a1f4bcSMatthew Wilcox #define task_is_stopped_or_traced(task) \ 203f021a3c2SMatthew Wilcox ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) 20492a1f4bcSMatthew Wilcox #define task_contributes_to_load(task) \ 20592a1f4bcSMatthew Wilcox ((task->state & TASK_UNINTERRUPTIBLE) != 0) 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds #define __set_task_state(tsk, state_value) \ 2081da177e4SLinus Torvalds do { (tsk)->state = (state_value); } while (0) 2091da177e4SLinus Torvalds #define set_task_state(tsk, state_value) \ 2101da177e4SLinus Torvalds set_mb((tsk)->state, (state_value)) 2111da177e4SLinus Torvalds 212498d0c57SAndrew Morton /* 213498d0c57SAndrew Morton * set_current_state() includes a barrier so that the write of current->state 214498d0c57SAndrew Morton * is correctly serialised wrt the caller's subsequent test of whether to 215498d0c57SAndrew Morton * actually sleep: 216498d0c57SAndrew Morton * 217498d0c57SAndrew Morton * set_current_state(TASK_UNINTERRUPTIBLE); 218498d0c57SAndrew Morton * if (do_i_need_to_sleep()) 219498d0c57SAndrew Morton * schedule(); 220498d0c57SAndrew Morton * 221498d0c57SAndrew Morton * If the caller does not need such serialisation then use __set_current_state() 222498d0c57SAndrew Morton */ 2231da177e4SLinus Torvalds #define __set_current_state(state_value) \ 2241da177e4SLinus Torvalds do { current->state = (state_value); } while (0) 2251da177e4SLinus Torvalds #define set_current_state(state_value) \ 2261da177e4SLinus Torvalds set_mb(current->state, (state_value)) 2271da177e4SLinus Torvalds 2281da177e4SLinus Torvalds /* Task command name length */ 2291da177e4SLinus Torvalds #define TASK_COMM_LEN 16 2301da177e4SLinus Torvalds 2311da177e4SLinus Torvalds #include <linux/spinlock.h> 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds /* 2341da177e4SLinus Torvalds * This serializes "schedule()" and also protects 2351da177e4SLinus Torvalds * the run-queue from deletions/modifications (but 2361da177e4SLinus Torvalds * _adding_ to the beginning of the run-queue has 2371da177e4SLinus Torvalds * a separate lock). 2381da177e4SLinus Torvalds */ 2391da177e4SLinus Torvalds extern rwlock_t tasklist_lock; 2401da177e4SLinus Torvalds extern spinlock_t mmlist_lock; 2411da177e4SLinus Torvalds 24236c8b586SIngo Molnar struct task_struct; 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds extern void sched_init(void); 2451da177e4SLinus Torvalds extern void sched_init_smp(void); 2462d07b255SHarvey Harrison extern asmlinkage void schedule_tail(struct task_struct *prev); 24736c8b586SIngo Molnar extern void init_idle(struct task_struct *idle, int cpu); 2481df21055SIngo Molnar extern void init_idle_bootup_task(struct task_struct *idle); 2491da177e4SLinus Torvalds 250017730c1SIngo Molnar extern int runqueue_is_locked(void); 251ad474cacSOleg Nesterov extern void task_rq_unlock_wait(struct task_struct *p); 252017730c1SIngo Molnar 2536a7b3dc3SRusty Russell extern cpumask_var_t nohz_cpu_mask; 25446cb4b7cSSiddha, Suresh B #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) 25546cb4b7cSSiddha, Suresh B extern int select_nohz_load_balancer(int cpu); 25646cb4b7cSSiddha, Suresh B #else 25746cb4b7cSSiddha, Suresh B static inline int select_nohz_load_balancer(int cpu) 25846cb4b7cSSiddha, Suresh B { 25946cb4b7cSSiddha, Suresh B return 0; 26046cb4b7cSSiddha, Suresh B } 26146cb4b7cSSiddha, Suresh B #endif 2621da177e4SLinus Torvalds 263e59e2ae2SIngo Molnar /* 26439bc89fdSIngo Molnar * Only dump TASK_* tasks. (0 for all tasks) 265e59e2ae2SIngo Molnar */ 266e59e2ae2SIngo Molnar extern void show_state_filter(unsigned long state_filter); 267e59e2ae2SIngo Molnar 268e59e2ae2SIngo Molnar static inline void show_state(void) 269e59e2ae2SIngo Molnar { 27039bc89fdSIngo Molnar show_state_filter(0); 271e59e2ae2SIngo Molnar } 272e59e2ae2SIngo Molnar 2731da177e4SLinus Torvalds extern void show_regs(struct pt_regs *); 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds /* 2761da177e4SLinus Torvalds * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 2771da177e4SLinus Torvalds * task), SP is the stack pointer of the first frame that should be shown in the back 2781da177e4SLinus Torvalds * trace (or NULL if the entire call-chain of the task should be shown). 2791da177e4SLinus Torvalds */ 2801da177e4SLinus Torvalds extern void show_stack(struct task_struct *task, unsigned long *sp); 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds void io_schedule(void); 2831da177e4SLinus Torvalds long io_schedule_timeout(long timeout); 2841da177e4SLinus Torvalds 2851da177e4SLinus Torvalds extern void cpu_init (void); 2861da177e4SLinus Torvalds extern void trap_init(void); 2871da177e4SLinus Torvalds extern void update_process_times(int user); 2881da177e4SLinus Torvalds extern void scheduler_tick(void); 2891da177e4SLinus Torvalds 29082a1fcb9SIngo Molnar extern void sched_show_task(struct task_struct *p); 29182a1fcb9SIngo Molnar 2928446f1d3SIngo Molnar #ifdef CONFIG_DETECT_SOFTLOCKUP 2936687a97dSIngo Molnar extern void softlockup_tick(void); 2948446f1d3SIngo Molnar extern void touch_softlockup_watchdog(void); 29504c9167fSJeremy Fitzhardinge extern void touch_all_softlockup_watchdogs(void); 296baf48f65SMandeep Singh Baines extern int proc_dosoftlockup_thresh(struct ctl_table *table, int write, 297baf48f65SMandeep Singh Baines struct file *filp, void __user *buffer, 298baf48f65SMandeep Singh Baines size_t *lenp, loff_t *ppos); 2999c44bc03SIngo Molnar extern unsigned int softlockup_panic; 3009383d967SDimitri Sivanich extern int softlockup_thresh; 3018446f1d3SIngo Molnar #else 3026687a97dSIngo Molnar static inline void softlockup_tick(void) 3038446f1d3SIngo Molnar { 3048446f1d3SIngo Molnar } 3058446f1d3SIngo Molnar static inline void spawn_softlockup_task(void) 3068446f1d3SIngo Molnar { 3078446f1d3SIngo Molnar } 3088446f1d3SIngo Molnar static inline void touch_softlockup_watchdog(void) 3098446f1d3SIngo Molnar { 3108446f1d3SIngo Molnar } 31104c9167fSJeremy Fitzhardinge static inline void touch_all_softlockup_watchdogs(void) 31204c9167fSJeremy Fitzhardinge { 31304c9167fSJeremy Fitzhardinge } 3148446f1d3SIngo Molnar #endif 3158446f1d3SIngo Molnar 316*e162b39aSMandeep Singh Baines #ifdef CONFIG_DETECT_HUNG_TASK 317*e162b39aSMandeep Singh Baines extern unsigned int sysctl_hung_task_panic; 318*e162b39aSMandeep Singh Baines extern unsigned long sysctl_hung_task_check_count; 319*e162b39aSMandeep Singh Baines extern unsigned long sysctl_hung_task_timeout_secs; 320*e162b39aSMandeep Singh Baines extern unsigned long sysctl_hung_task_warnings; 321*e162b39aSMandeep Singh Baines extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, 322*e162b39aSMandeep Singh Baines struct file *filp, void __user *buffer, 323*e162b39aSMandeep Singh Baines size_t *lenp, loff_t *ppos); 324*e162b39aSMandeep Singh Baines #endif 3258446f1d3SIngo Molnar 3261da177e4SLinus Torvalds /* Attach to any functions which should be ignored in wchan output. */ 3271da177e4SLinus Torvalds #define __sched __attribute__((__section__(".sched.text"))) 328deaf2227SIngo Molnar 329deaf2227SIngo Molnar /* Linker adds these: start and end of __sched functions */ 330deaf2227SIngo Molnar extern char __sched_text_start[], __sched_text_end[]; 331deaf2227SIngo Molnar 3321da177e4SLinus Torvalds /* Is this address in the __sched functions? */ 3331da177e4SLinus Torvalds extern int in_sched_functions(unsigned long addr); 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds #define MAX_SCHEDULE_TIMEOUT LONG_MAX 336b3c97528SHarvey Harrison extern signed long schedule_timeout(signed long timeout); 33764ed93a2SNishanth Aravamudan extern signed long schedule_timeout_interruptible(signed long timeout); 338294d5cc2SMatthew Wilcox extern signed long schedule_timeout_killable(signed long timeout); 33964ed93a2SNishanth Aravamudan extern signed long schedule_timeout_uninterruptible(signed long timeout); 3401da177e4SLinus Torvalds asmlinkage void schedule(void); 3411da177e4SLinus Torvalds 342ab516013SSerge E. Hallyn struct nsproxy; 343acce292cSCedric Le Goater struct user_namespace; 3441da177e4SLinus Torvalds 3451da177e4SLinus Torvalds /* Maximum number of active map areas.. This is a random (large) number */ 3461da177e4SLinus Torvalds #define DEFAULT_MAX_MAP_COUNT 65536 3471da177e4SLinus Torvalds 3481da177e4SLinus Torvalds extern int sysctl_max_map_count; 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds #include <linux/aio.h> 3511da177e4SLinus Torvalds 3521da177e4SLinus Torvalds extern unsigned long 3531da177e4SLinus Torvalds arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 3541da177e4SLinus Torvalds unsigned long, unsigned long); 3551da177e4SLinus Torvalds extern unsigned long 3561da177e4SLinus Torvalds arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 3571da177e4SLinus Torvalds unsigned long len, unsigned long pgoff, 3581da177e4SLinus Torvalds unsigned long flags); 3591363c3cdSWolfgang Wander extern void arch_unmap_area(struct mm_struct *, unsigned long); 3601363c3cdSWolfgang Wander extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 3611da177e4SLinus Torvalds 362f7d0b926SJeremy Fitzhardinge #if USE_SPLIT_PTLOCKS 363f412ac08SHugh Dickins /* 364f412ac08SHugh Dickins * The mm counters are not protected by its page_table_lock, 365f412ac08SHugh Dickins * so must be incremented atomically. 366f412ac08SHugh Dickins */ 367d3cb4871SChristoph Lameter #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 368d3cb4871SChristoph Lameter #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 369d3cb4871SChristoph Lameter #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 370d3cb4871SChristoph Lameter #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 371d3cb4871SChristoph Lameter #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 372f412ac08SHugh Dickins 373f7d0b926SJeremy Fitzhardinge #else /* !USE_SPLIT_PTLOCKS */ 374f412ac08SHugh Dickins /* 375f412ac08SHugh Dickins * The mm counters are protected by its page_table_lock, 376f412ac08SHugh Dickins * so can be incremented directly. 377f412ac08SHugh Dickins */ 3781da177e4SLinus Torvalds #define set_mm_counter(mm, member, value) (mm)->_##member = (value) 3791da177e4SLinus Torvalds #define get_mm_counter(mm, member) ((mm)->_##member) 3801da177e4SLinus Torvalds #define add_mm_counter(mm, member, value) (mm)->_##member += (value) 3811da177e4SLinus Torvalds #define inc_mm_counter(mm, member) (mm)->_##member++ 3821da177e4SLinus Torvalds #define dec_mm_counter(mm, member) (mm)->_##member-- 3834294621fSHugh Dickins 384f7d0b926SJeremy Fitzhardinge #endif /* !USE_SPLIT_PTLOCKS */ 385f412ac08SHugh Dickins 386f412ac08SHugh Dickins #define get_mm_rss(mm) \ 387f412ac08SHugh Dickins (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 388365e9c87SHugh Dickins #define update_hiwater_rss(mm) do { \ 389365e9c87SHugh Dickins unsigned long _rss = get_mm_rss(mm); \ 390365e9c87SHugh Dickins if ((mm)->hiwater_rss < _rss) \ 391365e9c87SHugh Dickins (mm)->hiwater_rss = _rss; \ 392365e9c87SHugh Dickins } while (0) 393365e9c87SHugh Dickins #define update_hiwater_vm(mm) do { \ 394365e9c87SHugh Dickins if ((mm)->hiwater_vm < (mm)->total_vm) \ 395365e9c87SHugh Dickins (mm)->hiwater_vm = (mm)->total_vm; \ 396365e9c87SHugh Dickins } while (0) 397365e9c87SHugh Dickins 398901608d9SOleg Nesterov #define get_mm_hiwater_rss(mm) max((mm)->hiwater_rss, get_mm_rss(mm)) 399901608d9SOleg Nesterov #define get_mm_hiwater_vm(mm) max((mm)->hiwater_vm, (mm)->total_vm) 400901608d9SOleg Nesterov 4016c5d5238SKawai, Hidehiro extern void set_dumpable(struct mm_struct *mm, int value); 4026c5d5238SKawai, Hidehiro extern int get_dumpable(struct mm_struct *mm); 4036c5d5238SKawai, Hidehiro 4046c5d5238SKawai, Hidehiro /* mm flags */ 4053cb4a0bbSKawai, Hidehiro /* dumpable bits */ 4066c5d5238SKawai, Hidehiro #define MMF_DUMPABLE 0 /* core dump is permitted */ 4076c5d5238SKawai, Hidehiro #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 4083cb4a0bbSKawai, Hidehiro #define MMF_DUMPABLE_BITS 2 4093cb4a0bbSKawai, Hidehiro 4103cb4a0bbSKawai, Hidehiro /* coredump filter bits */ 4113cb4a0bbSKawai, Hidehiro #define MMF_DUMP_ANON_PRIVATE 2 4123cb4a0bbSKawai, Hidehiro #define MMF_DUMP_ANON_SHARED 3 4133cb4a0bbSKawai, Hidehiro #define MMF_DUMP_MAPPED_PRIVATE 4 4143cb4a0bbSKawai, Hidehiro #define MMF_DUMP_MAPPED_SHARED 5 41582df3973SRoland McGrath #define MMF_DUMP_ELF_HEADERS 6 416e575f111SKOSAKI Motohiro #define MMF_DUMP_HUGETLB_PRIVATE 7 417e575f111SKOSAKI Motohiro #define MMF_DUMP_HUGETLB_SHARED 8 4183cb4a0bbSKawai, Hidehiro #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 419e575f111SKOSAKI Motohiro #define MMF_DUMP_FILTER_BITS 7 4203cb4a0bbSKawai, Hidehiro #define MMF_DUMP_FILTER_MASK \ 4213cb4a0bbSKawai, Hidehiro (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 4223cb4a0bbSKawai, Hidehiro #define MMF_DUMP_FILTER_DEFAULT \ 423e575f111SKOSAKI Motohiro ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ 424656eb2cdSRoland McGrath (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) 425656eb2cdSRoland McGrath 426656eb2cdSRoland McGrath #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 427656eb2cdSRoland McGrath # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) 428656eb2cdSRoland McGrath #else 429656eb2cdSRoland McGrath # define MMF_DUMP_MASK_DEFAULT_ELF 0 430656eb2cdSRoland McGrath #endif 4316c5d5238SKawai, Hidehiro 4321da177e4SLinus Torvalds struct sighand_struct { 4331da177e4SLinus Torvalds atomic_t count; 4341da177e4SLinus Torvalds struct k_sigaction action[_NSIG]; 4351da177e4SLinus Torvalds spinlock_t siglock; 436b8fceee1SDavide Libenzi wait_queue_head_t signalfd_wqh; 4371da177e4SLinus Torvalds }; 4381da177e4SLinus Torvalds 4390e464814SKaiGai Kohei struct pacct_struct { 440f6ec29a4SKaiGai Kohei int ac_flag; 441f6ec29a4SKaiGai Kohei long ac_exitcode; 4420e464814SKaiGai Kohei unsigned long ac_mem; 44377787bfbSKaiGai Kohei cputime_t ac_utime, ac_stime; 44477787bfbSKaiGai Kohei unsigned long ac_minflt, ac_majflt; 4450e464814SKaiGai Kohei }; 4460e464814SKaiGai Kohei 447f06febc9SFrank Mayhar /** 448f06febc9SFrank Mayhar * struct task_cputime - collected CPU time counts 449f06febc9SFrank Mayhar * @utime: time spent in user mode, in &cputime_t units 450f06febc9SFrank Mayhar * @stime: time spent in kernel mode, in &cputime_t units 451f06febc9SFrank Mayhar * @sum_exec_runtime: total time spent on the CPU, in nanoseconds 452f06febc9SFrank Mayhar * 453f06febc9SFrank Mayhar * This structure groups together three kinds of CPU time that are 454f06febc9SFrank Mayhar * tracked for threads and thread groups. Most things considering 455f06febc9SFrank Mayhar * CPU time want to group these counts together and treat all three 456f06febc9SFrank Mayhar * of them in parallel. 457f06febc9SFrank Mayhar */ 458f06febc9SFrank Mayhar struct task_cputime { 459f06febc9SFrank Mayhar cputime_t utime; 460f06febc9SFrank Mayhar cputime_t stime; 461f06febc9SFrank Mayhar unsigned long long sum_exec_runtime; 462f06febc9SFrank Mayhar }; 463f06febc9SFrank Mayhar /* Alternate field names when used to cache expirations. */ 464f06febc9SFrank Mayhar #define prof_exp stime 465f06febc9SFrank Mayhar #define virt_exp utime 466f06febc9SFrank Mayhar #define sched_exp sum_exec_runtime 467f06febc9SFrank Mayhar 468f06febc9SFrank Mayhar /** 469f06febc9SFrank Mayhar * struct thread_group_cputime - thread group interval timer counts 470f06febc9SFrank Mayhar * @totals: thread group interval timers; substructure for 471f06febc9SFrank Mayhar * uniprocessor kernel, per-cpu for SMP kernel. 472f06febc9SFrank Mayhar * 473f06febc9SFrank Mayhar * This structure contains the version of task_cputime, above, that is 474f06febc9SFrank Mayhar * used for thread group CPU clock calculations. 475f06febc9SFrank Mayhar */ 476f06febc9SFrank Mayhar struct thread_group_cputime { 477f06febc9SFrank Mayhar struct task_cputime *totals; 478f06febc9SFrank Mayhar }; 479f06febc9SFrank Mayhar 4801da177e4SLinus Torvalds /* 4811da177e4SLinus Torvalds * NOTE! "signal_struct" does not have it's own 4821da177e4SLinus Torvalds * locking, because a shared signal_struct always 4831da177e4SLinus Torvalds * implies a shared sighand_struct, so locking 4841da177e4SLinus Torvalds * sighand_struct is always a proper superset of 4851da177e4SLinus Torvalds * the locking of signal_struct. 4861da177e4SLinus Torvalds */ 4871da177e4SLinus Torvalds struct signal_struct { 4881da177e4SLinus Torvalds atomic_t count; 4891da177e4SLinus Torvalds atomic_t live; 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds wait_queue_head_t wait_chldexit; /* for wait4() */ 4921da177e4SLinus Torvalds 4931da177e4SLinus Torvalds /* current thread group signal load-balancing target: */ 49436c8b586SIngo Molnar struct task_struct *curr_target; 4951da177e4SLinus Torvalds 4961da177e4SLinus Torvalds /* shared signal handling: */ 4971da177e4SLinus Torvalds struct sigpending shared_pending; 4981da177e4SLinus Torvalds 4991da177e4SLinus Torvalds /* thread group exit support */ 5001da177e4SLinus Torvalds int group_exit_code; 5011da177e4SLinus Torvalds /* overloaded: 5021da177e4SLinus Torvalds * - notify group_exit_task when ->count is equal to notify_count 5031da177e4SLinus Torvalds * - everyone except group_exit_task is stopped during signal delivery 5041da177e4SLinus Torvalds * of fatal signals, group_exit_task processes the signal. 5051da177e4SLinus Torvalds */ 5061da177e4SLinus Torvalds int notify_count; 50707dd20e0SRichard Kennedy struct task_struct *group_exit_task; 5081da177e4SLinus Torvalds 5091da177e4SLinus Torvalds /* thread group stop support, overloads group_exit_code too */ 5101da177e4SLinus Torvalds int group_stop_count; 5111da177e4SLinus Torvalds unsigned int flags; /* see SIGNAL_* flags below */ 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds /* POSIX.1b Interval Timers */ 5141da177e4SLinus Torvalds struct list_head posix_timers; 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds /* ITIMER_REAL timer for the process */ 5172ff678b8SThomas Gleixner struct hrtimer real_timer; 518fea9d175SOleg Nesterov struct pid *leader_pid; 5192ff678b8SThomas Gleixner ktime_t it_real_incr; 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 5221da177e4SLinus Torvalds cputime_t it_prof_expires, it_virt_expires; 5231da177e4SLinus Torvalds cputime_t it_prof_incr, it_virt_incr; 5241da177e4SLinus Torvalds 525f06febc9SFrank Mayhar /* 526f06febc9SFrank Mayhar * Thread group totals for process CPU clocks. 527f06febc9SFrank Mayhar * See thread_group_cputime(), et al, for details. 528f06febc9SFrank Mayhar */ 529f06febc9SFrank Mayhar struct thread_group_cputime cputime; 530f06febc9SFrank Mayhar 531f06febc9SFrank Mayhar /* Earliest-expiration cache. */ 532f06febc9SFrank Mayhar struct task_cputime cputime_expires; 533f06febc9SFrank Mayhar 534f06febc9SFrank Mayhar struct list_head cpu_timers[3]; 535f06febc9SFrank Mayhar 5361da177e4SLinus Torvalds /* job control IDs */ 5379a2e7057SPavel Emelyanov 5389a2e7057SPavel Emelyanov /* 5399a2e7057SPavel Emelyanov * pgrp and session fields are deprecated. 5409a2e7057SPavel Emelyanov * use the task_session_Xnr and task_pgrp_Xnr routines below 5419a2e7057SPavel Emelyanov */ 5429a2e7057SPavel Emelyanov 5439a2e7057SPavel Emelyanov union { 5449a2e7057SPavel Emelyanov pid_t pgrp __deprecated; 5459a2e7057SPavel Emelyanov pid_t __pgrp; 5469a2e7057SPavel Emelyanov }; 5479a2e7057SPavel Emelyanov 548ab521dc0SEric W. Biederman struct pid *tty_old_pgrp; 5491ec320afSCedric Le Goater 5501ec320afSCedric Le Goater union { 5511ec320afSCedric Le Goater pid_t session __deprecated; 5521ec320afSCedric Le Goater pid_t __session; 5531ec320afSCedric Le Goater }; 5541ec320afSCedric Le Goater 5551da177e4SLinus Torvalds /* boolean value for session group leader */ 5561da177e4SLinus Torvalds int leader; 5571da177e4SLinus Torvalds 5581da177e4SLinus Torvalds struct tty_struct *tty; /* NULL if no tty */ 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvalds /* 5611da177e4SLinus Torvalds * Cumulative resource counters for dead threads in the group, 5621da177e4SLinus Torvalds * and for reaped dead child processes forked by this group. 5631da177e4SLinus Torvalds * Live threads maintain their own counters and add to these 5641da177e4SLinus Torvalds * in __exit_signal, except for the group leader. 5651da177e4SLinus Torvalds */ 566f06febc9SFrank Mayhar cputime_t cutime, cstime; 5679ac52315SLaurent Vivier cputime_t gtime; 5689ac52315SLaurent Vivier cputime_t cgtime; 5691da177e4SLinus Torvalds unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 5701da177e4SLinus Torvalds unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 5716eaeeabaSEric Dumazet unsigned long inblock, oublock, cinblock, coublock; 572940389b8SAndrea Righi struct task_io_accounting ioac; 5731da177e4SLinus Torvalds 5741da177e4SLinus Torvalds /* 5751da177e4SLinus Torvalds * We don't bother to synchronize most readers of this at all, 5761da177e4SLinus Torvalds * because there is no reader checking a limit that actually needs 5771da177e4SLinus Torvalds * to get both rlim_cur and rlim_max atomically, and either one 5781da177e4SLinus Torvalds * alone is a single word that can safely be read normally. 5791da177e4SLinus Torvalds * getrlimit/setrlimit use task_lock(current->group_leader) to 5801da177e4SLinus Torvalds * protect this instead of the siglock, because they really 5811da177e4SLinus Torvalds * have no need to disable irqs. 5821da177e4SLinus Torvalds */ 5831da177e4SLinus Torvalds struct rlimit rlim[RLIM_NLIMITS]; 5841da177e4SLinus Torvalds 5850e464814SKaiGai Kohei #ifdef CONFIG_BSD_PROCESS_ACCT 5860e464814SKaiGai Kohei struct pacct_struct pacct; /* per-process accounting information */ 5870e464814SKaiGai Kohei #endif 588ad4ecbcbSShailabh Nagar #ifdef CONFIG_TASKSTATS 589ad4ecbcbSShailabh Nagar struct taskstats *stats; 590ad4ecbcbSShailabh Nagar #endif 591522ed776SMiloslav Trmac #ifdef CONFIG_AUDIT 592522ed776SMiloslav Trmac unsigned audit_tty; 593522ed776SMiloslav Trmac struct tty_audit_buf *tty_audit_buf; 594522ed776SMiloslav Trmac #endif 5951da177e4SLinus Torvalds }; 5961da177e4SLinus Torvalds 5974866cde0SNick Piggin /* Context switch must be unlocked if interrupts are to be enabled */ 5984866cde0SNick Piggin #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 5994866cde0SNick Piggin # define __ARCH_WANT_UNLOCKED_CTXSW 6004866cde0SNick Piggin #endif 6014866cde0SNick Piggin 6021da177e4SLinus Torvalds /* 6031da177e4SLinus Torvalds * Bits in flags field of signal_struct. 6041da177e4SLinus Torvalds */ 6051da177e4SLinus Torvalds #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 6061da177e4SLinus Torvalds #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 6071da177e4SLinus Torvalds #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 6081da177e4SLinus Torvalds #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 609e4420551SOleg Nesterov /* 610e4420551SOleg Nesterov * Pending notifications to parent. 611e4420551SOleg Nesterov */ 612e4420551SOleg Nesterov #define SIGNAL_CLD_STOPPED 0x00000010 613e4420551SOleg Nesterov #define SIGNAL_CLD_CONTINUED 0x00000020 614e4420551SOleg Nesterov #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 6151da177e4SLinus Torvalds 616fae5fa44SOleg Nesterov #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 617fae5fa44SOleg Nesterov 618ed5d2cacSOleg Nesterov /* If true, all threads except ->group_exit_task have pending SIGKILL */ 619ed5d2cacSOleg Nesterov static inline int signal_group_exit(const struct signal_struct *sig) 620ed5d2cacSOleg Nesterov { 621ed5d2cacSOleg Nesterov return (sig->flags & SIGNAL_GROUP_EXIT) || 622ed5d2cacSOleg Nesterov (sig->group_exit_task != NULL); 623ed5d2cacSOleg Nesterov } 624ed5d2cacSOleg Nesterov 6251da177e4SLinus Torvalds /* 6261da177e4SLinus Torvalds * Some day this will be a full-fledged user tracking system.. 6271da177e4SLinus Torvalds */ 6281da177e4SLinus Torvalds struct user_struct { 6291da177e4SLinus Torvalds atomic_t __count; /* reference count */ 6301da177e4SLinus Torvalds atomic_t processes; /* How many processes does this user have? */ 6311da177e4SLinus Torvalds atomic_t files; /* How many open files does this user have? */ 6321da177e4SLinus Torvalds atomic_t sigpending; /* How many pending signals does this user have? */ 6332d9048e2SAmy Griffis #ifdef CONFIG_INOTIFY_USER 6340eeca283SRobert Love atomic_t inotify_watches; /* How many inotify watches does this user have? */ 6350eeca283SRobert Love atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 6360eeca283SRobert Love #endif 6377ef9964eSDavide Libenzi #ifdef CONFIG_EPOLL 6387ef9964eSDavide Libenzi atomic_t epoll_devs; /* The number of epoll descriptors currently open */ 6397ef9964eSDavide Libenzi atomic_t epoll_watches; /* The number of file descriptors currently watched */ 6407ef9964eSDavide Libenzi #endif 641970a8645SAlexey Dobriyan #ifdef CONFIG_POSIX_MQUEUE 6421da177e4SLinus Torvalds /* protected by mq_lock */ 6431da177e4SLinus Torvalds unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 644970a8645SAlexey Dobriyan #endif 6451da177e4SLinus Torvalds unsigned long locked_shm; /* How many pages of mlocked shm ? */ 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds #ifdef CONFIG_KEYS 6481da177e4SLinus Torvalds struct key *uid_keyring; /* UID specific keyring */ 6491da177e4SLinus Torvalds struct key *session_keyring; /* UID's default session keyring */ 6501da177e4SLinus Torvalds #endif 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds /* Hash table maintenance information */ 653735de223SPavel Emelyanov struct hlist_node uidhash_node; 6541da177e4SLinus Torvalds uid_t uid; 65518b6e041SSerge Hallyn struct user_namespace *user_ns; 65624e377a8SSrivatsa Vaddagiri 657052f1dc7SPeter Zijlstra #ifdef CONFIG_USER_SCHED 6584cf86d77SIngo Molnar struct task_group *tg; 659b1a8c172SDhaval Giani #ifdef CONFIG_SYSFS 660eb41d946SKay Sievers struct kobject kobj; 6615cb350baSDhaval Giani struct work_struct work; 66224e377a8SSrivatsa Vaddagiri #endif 663b1a8c172SDhaval Giani #endif 6641da177e4SLinus Torvalds }; 6651da177e4SLinus Torvalds 666eb41d946SKay Sievers extern int uids_sysfs_init(void); 6675cb350baSDhaval Giani 6681da177e4SLinus Torvalds extern struct user_struct *find_user(uid_t); 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds extern struct user_struct root_user; 6711da177e4SLinus Torvalds #define INIT_USER (&root_user) 6721da177e4SLinus Torvalds 673b6dff3ecSDavid Howells 6741da177e4SLinus Torvalds struct backing_dev_info; 6751da177e4SLinus Torvalds struct reclaim_state; 6761da177e4SLinus Torvalds 67752f17b6cSChandra Seetharaman #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 6781da177e4SLinus Torvalds struct sched_info { 6791da177e4SLinus Torvalds /* cumulative counters */ 6802d72376bSIngo Molnar unsigned long pcount; /* # of times run on this cpu */ 6819c2c4802SKen Chen unsigned long long run_delay; /* time spent waiting on a runqueue */ 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds /* timestamps */ 684172ba844SBalbir Singh unsigned long long last_arrival,/* when we last ran on a cpu */ 6851da177e4SLinus Torvalds last_queued; /* when we were last queued to run */ 686b8efb561SIngo Molnar #ifdef CONFIG_SCHEDSTATS 687b8efb561SIngo Molnar /* BKL stats */ 688480b9434SKen Chen unsigned int bkl_count; 689b8efb561SIngo Molnar #endif 6901da177e4SLinus Torvalds }; 69152f17b6cSChandra Seetharaman #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 6921da177e4SLinus Torvalds 693ca74e92bSShailabh Nagar #ifdef CONFIG_TASK_DELAY_ACCT 694ca74e92bSShailabh Nagar struct task_delay_info { 695ca74e92bSShailabh Nagar spinlock_t lock; 696ca74e92bSShailabh Nagar unsigned int flags; /* Private per-task flags */ 697ca74e92bSShailabh Nagar 698ca74e92bSShailabh Nagar /* For each stat XXX, add following, aligned appropriately 699ca74e92bSShailabh Nagar * 700ca74e92bSShailabh Nagar * struct timespec XXX_start, XXX_end; 701ca74e92bSShailabh Nagar * u64 XXX_delay; 702ca74e92bSShailabh Nagar * u32 XXX_count; 703ca74e92bSShailabh Nagar * 704ca74e92bSShailabh Nagar * Atomicity of updates to XXX_delay, XXX_count protected by 705ca74e92bSShailabh Nagar * single lock above (split into XXX_lock if contention is an issue). 706ca74e92bSShailabh Nagar */ 7070ff92245SShailabh Nagar 7080ff92245SShailabh Nagar /* 7090ff92245SShailabh Nagar * XXX_count is incremented on every XXX operation, the delay 7100ff92245SShailabh Nagar * associated with the operation is added to XXX_delay. 7110ff92245SShailabh Nagar * XXX_delay contains the accumulated delay time in nanoseconds. 7120ff92245SShailabh Nagar */ 7130ff92245SShailabh Nagar struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 7140ff92245SShailabh Nagar u64 blkio_delay; /* wait for sync block io completion */ 7150ff92245SShailabh Nagar u64 swapin_delay; /* wait for swapin block io completion */ 7160ff92245SShailabh Nagar u32 blkio_count; /* total count of the number of sync block */ 7170ff92245SShailabh Nagar /* io operations performed */ 7180ff92245SShailabh Nagar u32 swapin_count; /* total count of the number of swapin block */ 7190ff92245SShailabh Nagar /* io operations performed */ 720873b4771SKeika Kobayashi 721873b4771SKeika Kobayashi struct timespec freepages_start, freepages_end; 722873b4771SKeika Kobayashi u64 freepages_delay; /* wait for memory reclaim */ 723873b4771SKeika Kobayashi u32 freepages_count; /* total count of memory reclaim */ 724ca74e92bSShailabh Nagar }; 72552f17b6cSChandra Seetharaman #endif /* CONFIG_TASK_DELAY_ACCT */ 72652f17b6cSChandra Seetharaman 72752f17b6cSChandra Seetharaman static inline int sched_info_on(void) 72852f17b6cSChandra Seetharaman { 72952f17b6cSChandra Seetharaman #ifdef CONFIG_SCHEDSTATS 73052f17b6cSChandra Seetharaman return 1; 73152f17b6cSChandra Seetharaman #elif defined(CONFIG_TASK_DELAY_ACCT) 73252f17b6cSChandra Seetharaman extern int delayacct_on; 73352f17b6cSChandra Seetharaman return delayacct_on; 73452f17b6cSChandra Seetharaman #else 73552f17b6cSChandra Seetharaman return 0; 736ca74e92bSShailabh Nagar #endif 73752f17b6cSChandra Seetharaman } 738ca74e92bSShailabh Nagar 739d15bcfdbSIngo Molnar enum cpu_idle_type { 740d15bcfdbSIngo Molnar CPU_IDLE, 741d15bcfdbSIngo Molnar CPU_NOT_IDLE, 742d15bcfdbSIngo Molnar CPU_NEWLY_IDLE, 743d15bcfdbSIngo Molnar CPU_MAX_IDLE_TYPES 7441da177e4SLinus Torvalds }; 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds /* 7471da177e4SLinus Torvalds * sched-domains (multiprocessor balancing) declarations: 7481da177e4SLinus Torvalds */ 7499aa7b369SIngo Molnar 7509aa7b369SIngo Molnar /* 7519aa7b369SIngo Molnar * Increase resolution of nice-level calculations: 7529aa7b369SIngo Molnar */ 7539aa7b369SIngo Molnar #define SCHED_LOAD_SHIFT 10 7549aa7b369SIngo Molnar #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 7559aa7b369SIngo Molnar 756f8700df7SSuresh Siddha #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 7571da177e4SLinus Torvalds 7582dd73a4fSPeter Williams #ifdef CONFIG_SMP 7591da177e4SLinus Torvalds #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 7601da177e4SLinus Torvalds #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 7611da177e4SLinus Torvalds #define SD_BALANCE_EXEC 4 /* Balance on exec */ 762147cbb4bSNick Piggin #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 763147cbb4bSNick Piggin #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 764147cbb4bSNick Piggin #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 765147cbb4bSNick Piggin #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 766147cbb4bSNick Piggin #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 7675c45bf27SSiddha, Suresh B #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 76889c4710eSSiddha, Suresh B #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ 76908c183f3SChristoph Lameter #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ 7701d3504fcSHidetoshi Seto #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */ 7715c45bf27SSiddha, Suresh B 772afb8a9b7SGautham R Shenoy enum powersavings_balance_level { 773afb8a9b7SGautham R Shenoy POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ 774afb8a9b7SGautham R Shenoy POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package 775afb8a9b7SGautham R Shenoy * first for long running threads 776afb8a9b7SGautham R Shenoy */ 777afb8a9b7SGautham R Shenoy POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle 778afb8a9b7SGautham R Shenoy * cpu package for power savings 779afb8a9b7SGautham R Shenoy */ 780afb8a9b7SGautham R Shenoy MAX_POWERSAVINGS_BALANCE_LEVELS 781afb8a9b7SGautham R Shenoy }; 78289c4710eSSiddha, Suresh B 783716707b2SVaidyanathan Srinivasan extern int sched_mc_power_savings, sched_smt_power_savings; 78489c4710eSSiddha, Suresh B 785716707b2SVaidyanathan Srinivasan static inline int sd_balance_for_mc_power(void) 786716707b2SVaidyanathan Srinivasan { 787716707b2SVaidyanathan Srinivasan if (sched_smt_power_savings) 788716707b2SVaidyanathan Srinivasan return SD_POWERSAVINGS_BALANCE; 7895c45bf27SSiddha, Suresh B 790716707b2SVaidyanathan Srinivasan return 0; 791716707b2SVaidyanathan Srinivasan } 792716707b2SVaidyanathan Srinivasan 793716707b2SVaidyanathan Srinivasan static inline int sd_balance_for_package_power(void) 794716707b2SVaidyanathan Srinivasan { 795716707b2SVaidyanathan Srinivasan if (sched_mc_power_savings | sched_smt_power_savings) 796716707b2SVaidyanathan Srinivasan return SD_POWERSAVINGS_BALANCE; 797716707b2SVaidyanathan Srinivasan 798716707b2SVaidyanathan Srinivasan return 0; 799716707b2SVaidyanathan Srinivasan } 8001da177e4SLinus Torvalds 801100fdaeeSVaidyanathan Srinivasan /* 802100fdaeeSVaidyanathan Srinivasan * Optimise SD flags for power savings: 803100fdaeeSVaidyanathan Srinivasan * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. 804100fdaeeSVaidyanathan Srinivasan * Keep default SD flags if sched_{smt,mc}_power_saving=0 805100fdaeeSVaidyanathan Srinivasan */ 806100fdaeeSVaidyanathan Srinivasan 807100fdaeeSVaidyanathan Srinivasan static inline int sd_power_saving_flags(void) 808100fdaeeSVaidyanathan Srinivasan { 809100fdaeeSVaidyanathan Srinivasan if (sched_mc_power_savings | sched_smt_power_savings) 810100fdaeeSVaidyanathan Srinivasan return SD_BALANCE_NEWIDLE; 811100fdaeeSVaidyanathan Srinivasan 812100fdaeeSVaidyanathan Srinivasan return 0; 813100fdaeeSVaidyanathan Srinivasan } 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvalds struct sched_group { 8161da177e4SLinus Torvalds struct sched_group *next; /* Must be a circular list */ 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds /* 8191da177e4SLinus Torvalds * CPU power of this group, SCHED_LOAD_SCALE being max power for a 8201da177e4SLinus Torvalds * single CPU. This is read only (except for setup, hotplug CPU). 8215517d86bSEric Dumazet * Note : Never change cpu_power without recompute its reciprocal 8221da177e4SLinus Torvalds */ 8235517d86bSEric Dumazet unsigned int __cpu_power; 8245517d86bSEric Dumazet /* 8255517d86bSEric Dumazet * reciprocal value of cpu_power to avoid expensive divides 8265517d86bSEric Dumazet * (see include/linux/reciprocal_div.h) 8275517d86bSEric Dumazet */ 8285517d86bSEric Dumazet u32 reciprocal_cpu_power; 8296c99e9adSRusty Russell 8306c99e9adSRusty Russell unsigned long cpumask[]; 8311da177e4SLinus Torvalds }; 8321da177e4SLinus Torvalds 833758b2cdcSRusty Russell static inline struct cpumask *sched_group_cpus(struct sched_group *sg) 834758b2cdcSRusty Russell { 8356c99e9adSRusty Russell return to_cpumask(sg->cpumask); 836758b2cdcSRusty Russell } 837758b2cdcSRusty Russell 8381d3504fcSHidetoshi Seto enum sched_domain_level { 8391d3504fcSHidetoshi Seto SD_LV_NONE = 0, 8401d3504fcSHidetoshi Seto SD_LV_SIBLING, 8411d3504fcSHidetoshi Seto SD_LV_MC, 8421d3504fcSHidetoshi Seto SD_LV_CPU, 8431d3504fcSHidetoshi Seto SD_LV_NODE, 8441d3504fcSHidetoshi Seto SD_LV_ALLNODES, 8451d3504fcSHidetoshi Seto SD_LV_MAX 8461d3504fcSHidetoshi Seto }; 8471d3504fcSHidetoshi Seto 8481d3504fcSHidetoshi Seto struct sched_domain_attr { 8491d3504fcSHidetoshi Seto int relax_domain_level; 8501d3504fcSHidetoshi Seto }; 8511d3504fcSHidetoshi Seto 8521d3504fcSHidetoshi Seto #define SD_ATTR_INIT (struct sched_domain_attr) { \ 8531d3504fcSHidetoshi Seto .relax_domain_level = -1, \ 8541d3504fcSHidetoshi Seto } 8551d3504fcSHidetoshi Seto 8561da177e4SLinus Torvalds struct sched_domain { 8571da177e4SLinus Torvalds /* These fields must be setup */ 8581da177e4SLinus Torvalds struct sched_domain *parent; /* top domain must be null terminated */ 8591a848870SSiddha, Suresh B struct sched_domain *child; /* bottom domain must be null terminated */ 8601da177e4SLinus Torvalds struct sched_group *groups; /* the balancing groups of the domain */ 8611da177e4SLinus Torvalds unsigned long min_interval; /* Minimum balance interval ms */ 8621da177e4SLinus Torvalds unsigned long max_interval; /* Maximum balance interval ms */ 8631da177e4SLinus Torvalds unsigned int busy_factor; /* less balancing by factor if busy */ 8641da177e4SLinus Torvalds unsigned int imbalance_pct; /* No balance until over watermark */ 8651da177e4SLinus Torvalds unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 8667897986bSNick Piggin unsigned int busy_idx; 8677897986bSNick Piggin unsigned int idle_idx; 8687897986bSNick Piggin unsigned int newidle_idx; 8697897986bSNick Piggin unsigned int wake_idx; 870147cbb4bSNick Piggin unsigned int forkexec_idx; 8711da177e4SLinus Torvalds int flags; /* See SD_* */ 8721d3504fcSHidetoshi Seto enum sched_domain_level level; 8731da177e4SLinus Torvalds 8741da177e4SLinus Torvalds /* Runtime fields. */ 8751da177e4SLinus Torvalds unsigned long last_balance; /* init to jiffies. units in jiffies */ 8761da177e4SLinus Torvalds unsigned int balance_interval; /* initialise to 1. units in ms. */ 8771da177e4SLinus Torvalds unsigned int nr_balance_failed; /* initialise to 0 */ 8781da177e4SLinus Torvalds 8792398f2c6SPeter Zijlstra u64 last_update; 8802398f2c6SPeter Zijlstra 8811da177e4SLinus Torvalds #ifdef CONFIG_SCHEDSTATS 8821da177e4SLinus Torvalds /* load_balance() stats */ 883480b9434SKen Chen unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 884480b9434SKen Chen unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 885480b9434SKen Chen unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 886480b9434SKen Chen unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 887480b9434SKen Chen unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 888480b9434SKen Chen unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 889480b9434SKen Chen unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 890480b9434SKen Chen unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 8911da177e4SLinus Torvalds 8921da177e4SLinus Torvalds /* Active load balancing */ 893480b9434SKen Chen unsigned int alb_count; 894480b9434SKen Chen unsigned int alb_failed; 895480b9434SKen Chen unsigned int alb_pushed; 8961da177e4SLinus Torvalds 89768767a0aSNick Piggin /* SD_BALANCE_EXEC stats */ 898480b9434SKen Chen unsigned int sbe_count; 899480b9434SKen Chen unsigned int sbe_balanced; 900480b9434SKen Chen unsigned int sbe_pushed; 9011da177e4SLinus Torvalds 90268767a0aSNick Piggin /* SD_BALANCE_FORK stats */ 903480b9434SKen Chen unsigned int sbf_count; 904480b9434SKen Chen unsigned int sbf_balanced; 905480b9434SKen Chen unsigned int sbf_pushed; 90668767a0aSNick Piggin 9071da177e4SLinus Torvalds /* try_to_wake_up() stats */ 908480b9434SKen Chen unsigned int ttwu_wake_remote; 909480b9434SKen Chen unsigned int ttwu_move_affine; 910480b9434SKen Chen unsigned int ttwu_move_balance; 9111da177e4SLinus Torvalds #endif 912a5d8c348SIngo Molnar #ifdef CONFIG_SCHED_DEBUG 913a5d8c348SIngo Molnar char *name; 914a5d8c348SIngo Molnar #endif 9156c99e9adSRusty Russell 9166c99e9adSRusty Russell /* span of all CPUs in this domain */ 9176c99e9adSRusty Russell unsigned long span[]; 9181da177e4SLinus Torvalds }; 9191da177e4SLinus Torvalds 920758b2cdcSRusty Russell static inline struct cpumask *sched_domain_span(struct sched_domain *sd) 921758b2cdcSRusty Russell { 9226c99e9adSRusty Russell return to_cpumask(sd->span); 923758b2cdcSRusty Russell } 924758b2cdcSRusty Russell 92596f874e2SRusty Russell extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new, 9261d3504fcSHidetoshi Seto struct sched_domain_attr *dattr_new); 927029190c5SPaul Jackson 92806aaf76aSIngo Molnar /* Test a flag in parent sched domain */ 92906aaf76aSIngo Molnar static inline int test_sd_parent(struct sched_domain *sd, int flag) 93006aaf76aSIngo Molnar { 93106aaf76aSIngo Molnar if (sd->parent && (sd->parent->flags & flag)) 93206aaf76aSIngo Molnar return 1; 93306aaf76aSIngo Molnar 93406aaf76aSIngo Molnar return 0; 93506aaf76aSIngo Molnar } 93606aaf76aSIngo Molnar 9371b427c15SIngo Molnar #else /* CONFIG_SMP */ 9381b427c15SIngo Molnar 9391b427c15SIngo Molnar struct sched_domain_attr; 9401b427c15SIngo Molnar 9411b427c15SIngo Molnar static inline void 94296f874e2SRusty Russell partition_sched_domains(int ndoms_new, struct cpumask *doms_new, 9431b427c15SIngo Molnar struct sched_domain_attr *dattr_new) 9441b427c15SIngo Molnar { 9451b427c15SIngo Molnar } 9461b427c15SIngo Molnar #endif /* !CONFIG_SMP */ 9471da177e4SLinus Torvalds 9481da177e4SLinus Torvalds struct io_context; /* See blkdev.h */ 9491da177e4SLinus Torvalds 9501da177e4SLinus Torvalds 951383f2835SChen, Kenneth W #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 95236c8b586SIngo Molnar extern void prefetch_stack(struct task_struct *t); 953383f2835SChen, Kenneth W #else 954383f2835SChen, Kenneth W static inline void prefetch_stack(struct task_struct *t) { } 955383f2835SChen, Kenneth W #endif 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds struct audit_context; /* See audit.c */ 9581da177e4SLinus Torvalds struct mempolicy; 959b92ce558SJens Axboe struct pipe_inode_info; 9604865ecf1SSerge E. Hallyn struct uts_namespace; 9611da177e4SLinus Torvalds 96220b8a59fSIngo Molnar struct rq; 96320b8a59fSIngo Molnar struct sched_domain; 96420b8a59fSIngo Molnar 96520b8a59fSIngo Molnar struct sched_class { 9665522d5d5SIngo Molnar const struct sched_class *next; 96720b8a59fSIngo Molnar 968fd390f6aSIngo Molnar void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 969f02231e5SIngo Molnar void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 9704530d7abSDmitry Adamushko void (*yield_task) (struct rq *rq); 97120b8a59fSIngo Molnar 97215afe09bSPeter Zijlstra void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync); 97320b8a59fSIngo Molnar 974fb8d4724SIngo Molnar struct task_struct * (*pick_next_task) (struct rq *rq); 97531ee529cSIngo Molnar void (*put_prev_task) (struct rq *rq, struct task_struct *p); 97620b8a59fSIngo Molnar 977681f3e68SPeter Williams #ifdef CONFIG_SMP 9784ce72a2cSLi Zefan int (*select_task_rq)(struct task_struct *p, int sync); 9794ce72a2cSLi Zefan 98043010659SPeter Williams unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 981e1d1484fSPeter Williams struct rq *busiest, unsigned long max_load_move, 98220b8a59fSIngo Molnar struct sched_domain *sd, enum cpu_idle_type idle, 983a4ac01c3SPeter Williams int *all_pinned, int *this_best_prio); 98420b8a59fSIngo Molnar 985e1d1484fSPeter Williams int (*move_one_task) (struct rq *this_rq, int this_cpu, 986e1d1484fSPeter Williams struct rq *busiest, struct sched_domain *sd, 987e1d1484fSPeter Williams enum cpu_idle_type idle); 9889a897c5aSSteven Rostedt void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 9899a897c5aSSteven Rostedt void (*post_schedule) (struct rq *this_rq); 9909a897c5aSSteven Rostedt void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); 991e1d1484fSPeter Williams 992cd8ba7cdSMike Travis void (*set_cpus_allowed)(struct task_struct *p, 99396f874e2SRusty Russell const struct cpumask *newmask); 99457d885feSGregory Haskins 9951f11eb6aSGregory Haskins void (*rq_online)(struct rq *rq); 9961f11eb6aSGregory Haskins void (*rq_offline)(struct rq *rq); 9974ce72a2cSLi Zefan #endif 9984ce72a2cSLi Zefan 9994ce72a2cSLi Zefan void (*set_curr_task) (struct rq *rq); 10004ce72a2cSLi Zefan void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 10014ce72a2cSLi Zefan void (*task_new) (struct rq *rq, struct task_struct *p); 1002cb469845SSteven Rostedt 1003cb469845SSteven Rostedt void (*switched_from) (struct rq *this_rq, struct task_struct *task, 1004cb469845SSteven Rostedt int running); 1005cb469845SSteven Rostedt void (*switched_to) (struct rq *this_rq, struct task_struct *task, 1006cb469845SSteven Rostedt int running); 1007cb469845SSteven Rostedt void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 1008cb469845SSteven Rostedt int oldprio, int running); 1009810b3817SPeter Zijlstra 1010810b3817SPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 1011810b3817SPeter Zijlstra void (*moved_group) (struct task_struct *p); 1012810b3817SPeter Zijlstra #endif 101320b8a59fSIngo Molnar }; 101420b8a59fSIngo Molnar 101520b8a59fSIngo Molnar struct load_weight { 101620b8a59fSIngo Molnar unsigned long weight, inv_weight; 101720b8a59fSIngo Molnar }; 101820b8a59fSIngo Molnar 101920b8a59fSIngo Molnar /* 102020b8a59fSIngo Molnar * CFS stats for a schedulable entity (task, task-group etc) 102120b8a59fSIngo Molnar * 102220b8a59fSIngo Molnar * Current field usage histogram: 102320b8a59fSIngo Molnar * 102420b8a59fSIngo Molnar * 4 se->block_start 102520b8a59fSIngo Molnar * 4 se->run_node 102620b8a59fSIngo Molnar * 4 se->sleep_start 102720b8a59fSIngo Molnar * 6 se->load.weight 102820b8a59fSIngo Molnar */ 102920b8a59fSIngo Molnar struct sched_entity { 103020b8a59fSIngo Molnar struct load_weight load; /* for load-balancing */ 103120b8a59fSIngo Molnar struct rb_node run_node; 10324a55bd5eSPeter Zijlstra struct list_head group_node; 103320b8a59fSIngo Molnar unsigned int on_rq; 103420b8a59fSIngo Molnar 103520b8a59fSIngo Molnar u64 exec_start; 103694c18227SIngo Molnar u64 sum_exec_runtime; 1037e9acbff6SIngo Molnar u64 vruntime; 1038f6cf891cSIngo Molnar u64 prev_sum_exec_runtime; 103994c18227SIngo Molnar 10404ae7d5ceSIngo Molnar u64 last_wakeup; 10414ae7d5ceSIngo Molnar u64 avg_overlap; 10424ae7d5ceSIngo Molnar 104394c18227SIngo Molnar #ifdef CONFIG_SCHEDSTATS 104494c18227SIngo Molnar u64 wait_start; 104594c18227SIngo Molnar u64 wait_max; 10466d082592SArjan van de Ven u64 wait_count; 10476d082592SArjan van de Ven u64 wait_sum; 104894c18227SIngo Molnar 104994c18227SIngo Molnar u64 sleep_start; 105020b8a59fSIngo Molnar u64 sleep_max; 105194c18227SIngo Molnar s64 sum_sleep_runtime; 105294c18227SIngo Molnar 105394c18227SIngo Molnar u64 block_start; 105420b8a59fSIngo Molnar u64 block_max; 105520b8a59fSIngo Molnar u64 exec_max; 1056eba1ed4bSIngo Molnar u64 slice_max; 1057cc367732SIngo Molnar 1058cc367732SIngo Molnar u64 nr_migrations; 1059cc367732SIngo Molnar u64 nr_migrations_cold; 1060cc367732SIngo Molnar u64 nr_failed_migrations_affine; 1061cc367732SIngo Molnar u64 nr_failed_migrations_running; 1062cc367732SIngo Molnar u64 nr_failed_migrations_hot; 1063cc367732SIngo Molnar u64 nr_forced_migrations; 1064cc367732SIngo Molnar u64 nr_forced2_migrations; 1065cc367732SIngo Molnar 1066cc367732SIngo Molnar u64 nr_wakeups; 1067cc367732SIngo Molnar u64 nr_wakeups_sync; 1068cc367732SIngo Molnar u64 nr_wakeups_migrate; 1069cc367732SIngo Molnar u64 nr_wakeups_local; 1070cc367732SIngo Molnar u64 nr_wakeups_remote; 1071cc367732SIngo Molnar u64 nr_wakeups_affine; 1072cc367732SIngo Molnar u64 nr_wakeups_affine_attempts; 1073cc367732SIngo Molnar u64 nr_wakeups_passive; 1074cc367732SIngo Molnar u64 nr_wakeups_idle; 107594c18227SIngo Molnar #endif 107694c18227SIngo Molnar 107720b8a59fSIngo Molnar #ifdef CONFIG_FAIR_GROUP_SCHED 107820b8a59fSIngo Molnar struct sched_entity *parent; 107920b8a59fSIngo Molnar /* rq on which this entity is (to be) queued: */ 108020b8a59fSIngo Molnar struct cfs_rq *cfs_rq; 108120b8a59fSIngo Molnar /* rq "owned" by this entity/group: */ 108220b8a59fSIngo Molnar struct cfs_rq *my_q; 108320b8a59fSIngo Molnar #endif 108420b8a59fSIngo Molnar }; 108570b97a7fSIngo Molnar 1086fa717060SPeter Zijlstra struct sched_rt_entity { 1087fa717060SPeter Zijlstra struct list_head run_list; 108878f2c7dbSPeter Zijlstra unsigned long timeout; 1089bee367edSRichard Kennedy unsigned int time_slice; 10906f505b16SPeter Zijlstra int nr_cpus_allowed; 10916f505b16SPeter Zijlstra 109258d6c2d7SPeter Zijlstra struct sched_rt_entity *back; 1093052f1dc7SPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 10946f505b16SPeter Zijlstra struct sched_rt_entity *parent; 10956f505b16SPeter Zijlstra /* rq on which this entity is (to be) queued: */ 10966f505b16SPeter Zijlstra struct rt_rq *rt_rq; 10976f505b16SPeter Zijlstra /* rq "owned" by this entity/group: */ 10986f505b16SPeter Zijlstra struct rt_rq *my_q; 10996f505b16SPeter Zijlstra #endif 1100fa717060SPeter Zijlstra }; 1101fa717060SPeter Zijlstra 11021da177e4SLinus Torvalds struct task_struct { 11031da177e4SLinus Torvalds volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1104f7e4217bSRoman Zippel void *stack; 11051da177e4SLinus Torvalds atomic_t usage; 110697dc32cdSWilliam Cohen unsigned int flags; /* per process flags, defined below */ 110797dc32cdSWilliam Cohen unsigned int ptrace; 11081da177e4SLinus Torvalds 110936772092SPaolo 'Blaisorblade' Giarrusso int lock_depth; /* BKL lock depth */ 11101da177e4SLinus Torvalds 11112dd73a4fSPeter Williams #ifdef CONFIG_SMP 11122dd73a4fSPeter Williams #ifdef __ARCH_WANT_UNLOCKED_CTXSW 11134866cde0SNick Piggin int oncpu; 11144866cde0SNick Piggin #endif 11152dd73a4fSPeter Williams #endif 111650e645a8SIngo Molnar 1117b29739f9SIngo Molnar int prio, static_prio, normal_prio; 1118c7aceabaSRichard Kennedy unsigned int rt_priority; 11195522d5d5SIngo Molnar const struct sched_class *sched_class; 112020b8a59fSIngo Molnar struct sched_entity se; 1121fa717060SPeter Zijlstra struct sched_rt_entity rt; 11221da177e4SLinus Torvalds 1123e107be36SAvi Kivity #ifdef CONFIG_PREEMPT_NOTIFIERS 1124e107be36SAvi Kivity /* list of struct preempt_notifier: */ 1125e107be36SAvi Kivity struct hlist_head preempt_notifiers; 1126e107be36SAvi Kivity #endif 1127e107be36SAvi Kivity 112818796aa0SAlexey Dobriyan /* 112918796aa0SAlexey Dobriyan * fpu_counter contains the number of consecutive context switches 113018796aa0SAlexey Dobriyan * that the FPU is used. If this is over a threshold, the lazy fpu 113118796aa0SAlexey Dobriyan * saving becomes unlazy to save the trap. This is an unsigned char 113218796aa0SAlexey Dobriyan * so that after 256 times the counter wraps and the behavior turns 113318796aa0SAlexey Dobriyan * lazy again; this to deal with bursty apps that only use FPU for 113418796aa0SAlexey Dobriyan * a short time 113518796aa0SAlexey Dobriyan */ 113618796aa0SAlexey Dobriyan unsigned char fpu_counter; 113718796aa0SAlexey Dobriyan s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 11386c5c9341SAlexey Dobriyan #ifdef CONFIG_BLK_DEV_IO_TRACE 11392056a782SJens Axboe unsigned int btrace_seq; 11406c5c9341SAlexey Dobriyan #endif 11411da177e4SLinus Torvalds 114297dc32cdSWilliam Cohen unsigned int policy; 11431da177e4SLinus Torvalds cpumask_t cpus_allowed; 11441da177e4SLinus Torvalds 1145e260be67SPaul E. McKenney #ifdef CONFIG_PREEMPT_RCU 1146e260be67SPaul E. McKenney int rcu_read_lock_nesting; 1147e260be67SPaul E. McKenney int rcu_flipctr_idx; 1148e260be67SPaul E. McKenney #endif /* #ifdef CONFIG_PREEMPT_RCU */ 1149e260be67SPaul E. McKenney 115052f17b6cSChandra Seetharaman #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 11511da177e4SLinus Torvalds struct sched_info sched_info; 11521da177e4SLinus Torvalds #endif 11531da177e4SLinus Torvalds 11541da177e4SLinus Torvalds struct list_head tasks; 11551da177e4SLinus Torvalds 11561da177e4SLinus Torvalds struct mm_struct *mm, *active_mm; 11571da177e4SLinus Torvalds 11581da177e4SLinus Torvalds /* task state */ 11591da177e4SLinus Torvalds struct linux_binfmt *binfmt; 116097dc32cdSWilliam Cohen int exit_state; 11611da177e4SLinus Torvalds int exit_code, exit_signal; 11621da177e4SLinus Torvalds int pdeath_signal; /* The signal sent when the parent dies */ 11631da177e4SLinus Torvalds /* ??? */ 116497dc32cdSWilliam Cohen unsigned int personality; 11651da177e4SLinus Torvalds unsigned did_exec:1; 11661da177e4SLinus Torvalds pid_t pid; 11671da177e4SLinus Torvalds pid_t tgid; 11680a425405SArjan van de Ven 11690a425405SArjan van de Ven #ifdef CONFIG_CC_STACKPROTECTOR 11700a425405SArjan van de Ven /* Canary value for the -fstack-protector gcc feature */ 11710a425405SArjan van de Ven unsigned long stack_canary; 11720a425405SArjan van de Ven #endif 11731da177e4SLinus Torvalds /* 11741da177e4SLinus Torvalds * pointers to (original) parent process, youngest child, younger sibling, 11751da177e4SLinus Torvalds * older sibling, respectively. (p->father can be replaced with 1176f470021aSRoland McGrath * p->real_parent->pid) 11771da177e4SLinus Torvalds */ 1178f470021aSRoland McGrath struct task_struct *real_parent; /* real parent process */ 1179f470021aSRoland McGrath struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 11801da177e4SLinus Torvalds /* 1181f470021aSRoland McGrath * children/sibling forms the list of my natural children 11821da177e4SLinus Torvalds */ 11831da177e4SLinus Torvalds struct list_head children; /* list of my children */ 11841da177e4SLinus Torvalds struct list_head sibling; /* linkage in my parent's children list */ 11851da177e4SLinus Torvalds struct task_struct *group_leader; /* threadgroup leader */ 11861da177e4SLinus Torvalds 1187f470021aSRoland McGrath /* 1188f470021aSRoland McGrath * ptraced is the list of tasks this task is using ptrace on. 1189f470021aSRoland McGrath * This includes both natural children and PTRACE_ATTACH targets. 1190f470021aSRoland McGrath * p->ptrace_entry is p's link on the p->parent->ptraced list. 1191f470021aSRoland McGrath */ 1192f470021aSRoland McGrath struct list_head ptraced; 1193f470021aSRoland McGrath struct list_head ptrace_entry; 1194f470021aSRoland McGrath 1195ca0002a1SMarkus Metzger #ifdef CONFIG_X86_PTRACE_BTS 1196ca0002a1SMarkus Metzger /* 1197ca0002a1SMarkus Metzger * This is the tracer handle for the ptrace BTS extension. 1198ca0002a1SMarkus Metzger * This field actually belongs to the ptracer task. 1199ca0002a1SMarkus Metzger */ 1200ca0002a1SMarkus Metzger struct bts_tracer *bts; 12016abb11aeSMarkus Metzger /* 12026abb11aeSMarkus Metzger * The buffer to hold the BTS data. 12036abb11aeSMarkus Metzger */ 12046abb11aeSMarkus Metzger void *bts_buffer; 1205c2724775SMarkus Metzger size_t bts_size; 1206ca0002a1SMarkus Metzger #endif /* CONFIG_X86_PTRACE_BTS */ 1207ca0002a1SMarkus Metzger 12081da177e4SLinus Torvalds /* PID/PID hash table linkage. */ 120992476d7fSEric W. Biederman struct pid_link pids[PIDTYPE_MAX]; 121047e65328SOleg Nesterov struct list_head thread_group; 12111da177e4SLinus Torvalds 12121da177e4SLinus Torvalds struct completion *vfork_done; /* for vfork() */ 12131da177e4SLinus Torvalds int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 12141da177e4SLinus Torvalds int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 12151da177e4SLinus Torvalds 1216c66f08beSMichael Neuling cputime_t utime, stime, utimescaled, stimescaled; 12179ac52315SLaurent Vivier cputime_t gtime; 12189301899bSBalbir Singh cputime_t prev_utime, prev_stime; 12191da177e4SLinus Torvalds unsigned long nvcsw, nivcsw; /* context switch counts */ 1220924b42d5STomas Janousek struct timespec start_time; /* monotonic time */ 1221924b42d5STomas Janousek struct timespec real_start_time; /* boot based time */ 12221da177e4SLinus Torvalds /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 12231da177e4SLinus Torvalds unsigned long min_flt, maj_flt; 12241da177e4SLinus Torvalds 1225f06febc9SFrank Mayhar struct task_cputime cputime_expires; 12261da177e4SLinus Torvalds struct list_head cpu_timers[3]; 12271da177e4SLinus Torvalds 12281da177e4SLinus Torvalds /* process credentials */ 12293b11a1deSDavid Howells const struct cred *real_cred; /* objective and real subjective task 12303b11a1deSDavid Howells * credentials (COW) */ 12313b11a1deSDavid Howells const struct cred *cred; /* effective (overridable) subjective task 12323b11a1deSDavid Howells * credentials (COW) */ 1233d84f4f99SDavid Howells struct mutex cred_exec_mutex; /* execve vs ptrace cred calculation mutex */ 1234b6dff3ecSDavid Howells 123536772092SPaolo 'Blaisorblade' Giarrusso char comm[TASK_COMM_LEN]; /* executable name excluding path 123636772092SPaolo 'Blaisorblade' Giarrusso - access with [gs]et_task_comm (which lock 123736772092SPaolo 'Blaisorblade' Giarrusso it with task_lock()) 123836772092SPaolo 'Blaisorblade' Giarrusso - initialized normally by flush_old_exec */ 12391da177e4SLinus Torvalds /* file system info */ 12401da177e4SLinus Torvalds int link_count, total_link_count; 12413d5b6fccSAlexey Dobriyan #ifdef CONFIG_SYSVIPC 12421da177e4SLinus Torvalds /* ipc stuff */ 12431da177e4SLinus Torvalds struct sysv_sem sysvsem; 12443d5b6fccSAlexey Dobriyan #endif 1245*e162b39aSMandeep Singh Baines #ifdef CONFIG_DETECT_HUNG_TASK 124682a1fcb9SIngo Molnar /* hung task detection */ 124782a1fcb9SIngo Molnar unsigned long last_switch_timestamp; 124882a1fcb9SIngo Molnar unsigned long last_switch_count; 124982a1fcb9SIngo Molnar #endif 12501da177e4SLinus Torvalds /* CPU-specific state of this task */ 12511da177e4SLinus Torvalds struct thread_struct thread; 12521da177e4SLinus Torvalds /* filesystem information */ 12531da177e4SLinus Torvalds struct fs_struct *fs; 12541da177e4SLinus Torvalds /* open file information */ 12551da177e4SLinus Torvalds struct files_struct *files; 12561651e14eSSerge E. Hallyn /* namespaces */ 1257ab516013SSerge E. Hallyn struct nsproxy *nsproxy; 12581da177e4SLinus Torvalds /* signal handlers */ 12591da177e4SLinus Torvalds struct signal_struct *signal; 12601da177e4SLinus Torvalds struct sighand_struct *sighand; 12611da177e4SLinus Torvalds 12621da177e4SLinus Torvalds sigset_t blocked, real_blocked; 1263f3de272bSRoland McGrath sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 12641da177e4SLinus Torvalds struct sigpending pending; 12651da177e4SLinus Torvalds 12661da177e4SLinus Torvalds unsigned long sas_ss_sp; 12671da177e4SLinus Torvalds size_t sas_ss_size; 12681da177e4SLinus Torvalds int (*notifier)(void *priv); 12691da177e4SLinus Torvalds void *notifier_data; 12701da177e4SLinus Torvalds sigset_t *notifier_mask; 12711da177e4SLinus Torvalds struct audit_context *audit_context; 1272bfef93a5SAl Viro #ifdef CONFIG_AUDITSYSCALL 1273bfef93a5SAl Viro uid_t loginuid; 12744746ec5bSEric Paris unsigned int sessionid; 1275bfef93a5SAl Viro #endif 12761da177e4SLinus Torvalds seccomp_t seccomp; 12771da177e4SLinus Torvalds 12781da177e4SLinus Torvalds /* Thread group tracking */ 12791da177e4SLinus Torvalds u32 parent_exec_id; 12801da177e4SLinus Torvalds u32 self_exec_id; 12811da177e4SLinus Torvalds /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 12821da177e4SLinus Torvalds spinlock_t alloc_lock; 12831da177e4SLinus Torvalds 1284b29739f9SIngo Molnar /* Protection of the PI data structures: */ 1285b29739f9SIngo Molnar spinlock_t pi_lock; 1286b29739f9SIngo Molnar 128723f78d4aSIngo Molnar #ifdef CONFIG_RT_MUTEXES 128823f78d4aSIngo Molnar /* PI waiters blocked on a rt_mutex held by this task */ 128923f78d4aSIngo Molnar struct plist_head pi_waiters; 129023f78d4aSIngo Molnar /* Deadlock detection and priority inheritance handling */ 129123f78d4aSIngo Molnar struct rt_mutex_waiter *pi_blocked_on; 129223f78d4aSIngo Molnar #endif 129323f78d4aSIngo Molnar 1294408894eeSIngo Molnar #ifdef CONFIG_DEBUG_MUTEXES 1295408894eeSIngo Molnar /* mutex deadlock detection */ 1296408894eeSIngo Molnar struct mutex_waiter *blocked_on; 1297408894eeSIngo Molnar #endif 1298de30a2b3SIngo Molnar #ifdef CONFIG_TRACE_IRQFLAGS 1299de30a2b3SIngo Molnar unsigned int irq_events; 1300de30a2b3SIngo Molnar int hardirqs_enabled; 1301de30a2b3SIngo Molnar unsigned long hardirq_enable_ip; 1302de30a2b3SIngo Molnar unsigned int hardirq_enable_event; 1303de30a2b3SIngo Molnar unsigned long hardirq_disable_ip; 1304de30a2b3SIngo Molnar unsigned int hardirq_disable_event; 1305de30a2b3SIngo Molnar int softirqs_enabled; 1306de30a2b3SIngo Molnar unsigned long softirq_disable_ip; 1307de30a2b3SIngo Molnar unsigned int softirq_disable_event; 1308de30a2b3SIngo Molnar unsigned long softirq_enable_ip; 1309de30a2b3SIngo Molnar unsigned int softirq_enable_event; 1310de30a2b3SIngo Molnar int hardirq_context; 1311de30a2b3SIngo Molnar int softirq_context; 1312de30a2b3SIngo Molnar #endif 1313fbb9ce95SIngo Molnar #ifdef CONFIG_LOCKDEP 1314bdb9441eSPeter Zijlstra # define MAX_LOCK_DEPTH 48UL 1315fbb9ce95SIngo Molnar u64 curr_chain_key; 1316fbb9ce95SIngo Molnar int lockdep_depth; 1317fbb9ce95SIngo Molnar unsigned int lockdep_recursion; 1318c7aceabaSRichard Kennedy struct held_lock held_locks[MAX_LOCK_DEPTH]; 1319fbb9ce95SIngo Molnar #endif 1320408894eeSIngo Molnar 13211da177e4SLinus Torvalds /* journalling filesystem info */ 13221da177e4SLinus Torvalds void *journal_info; 13231da177e4SLinus Torvalds 1324d89d8796SNeil Brown /* stacked block device info */ 1325d89d8796SNeil Brown struct bio *bio_list, **bio_tail; 1326d89d8796SNeil Brown 13271da177e4SLinus Torvalds /* VM state */ 13281da177e4SLinus Torvalds struct reclaim_state *reclaim_state; 13291da177e4SLinus Torvalds 13301da177e4SLinus Torvalds struct backing_dev_info *backing_dev_info; 13311da177e4SLinus Torvalds 13321da177e4SLinus Torvalds struct io_context *io_context; 13331da177e4SLinus Torvalds 13341da177e4SLinus Torvalds unsigned long ptrace_message; 13351da177e4SLinus Torvalds siginfo_t *last_siginfo; /* For ptrace use. */ 1336940389b8SAndrea Righi struct task_io_accounting ioac; 13378f0ab514SJay Lan #if defined(CONFIG_TASK_XACCT) 13381da177e4SLinus Torvalds u64 acct_rss_mem1; /* accumulated rss usage */ 13391da177e4SLinus Torvalds u64 acct_vm_mem1; /* accumulated virtual memory usage */ 134049b5cf34SJonathan Lim cputime_t acct_timexpd; /* stime + utime since last update */ 13411da177e4SLinus Torvalds #endif 13421da177e4SLinus Torvalds #ifdef CONFIG_CPUSETS 13431da177e4SLinus Torvalds nodemask_t mems_allowed; 13441da177e4SLinus Torvalds int cpuset_mems_generation; 1345825a46afSPaul Jackson int cpuset_mem_spread_rotor; 13461da177e4SLinus Torvalds #endif 1347ddbcc7e8SPaul Menage #ifdef CONFIG_CGROUPS 1348817929ecSPaul Menage /* Control Group info protected by css_set_lock */ 1349817929ecSPaul Menage struct css_set *cgroups; 1350817929ecSPaul Menage /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1351817929ecSPaul Menage struct list_head cg_list; 1352ddbcc7e8SPaul Menage #endif 135342b2dd0aSAlexey Dobriyan #ifdef CONFIG_FUTEX 13540771dfefSIngo Molnar struct robust_list_head __user *robust_list; 135534f192c6SIngo Molnar #ifdef CONFIG_COMPAT 135634f192c6SIngo Molnar struct compat_robust_list_head __user *compat_robust_list; 135734f192c6SIngo Molnar #endif 1358c87e2837SIngo Molnar struct list_head pi_state_list; 1359c87e2837SIngo Molnar struct futex_pi_state *pi_state_cache; 136042b2dd0aSAlexey Dobriyan #endif 1361c7aceabaSRichard Kennedy #ifdef CONFIG_NUMA 1362c7aceabaSRichard Kennedy struct mempolicy *mempolicy; 1363c7aceabaSRichard Kennedy short il_next; 1364c7aceabaSRichard Kennedy #endif 136522e2c507SJens Axboe atomic_t fs_excl; /* holding fs exclusive resources */ 1366e56d0903SIngo Molnar struct rcu_head rcu; 1367b92ce558SJens Axboe 1368b92ce558SJens Axboe /* 1369b92ce558SJens Axboe * cache last used pipe for splice 1370b92ce558SJens Axboe */ 1371b92ce558SJens Axboe struct pipe_inode_info *splice_pipe; 1372ca74e92bSShailabh Nagar #ifdef CONFIG_TASK_DELAY_ACCT 1373ca74e92bSShailabh Nagar struct task_delay_info *delays; 1374ca74e92bSShailabh Nagar #endif 1375f4f154fdSAkinobu Mita #ifdef CONFIG_FAULT_INJECTION 1376f4f154fdSAkinobu Mita int make_it_fail; 1377f4f154fdSAkinobu Mita #endif 13783e26c149SPeter Zijlstra struct prop_local_single dirties; 13799745512cSArjan van de Ven #ifdef CONFIG_LATENCYTOP 13809745512cSArjan van de Ven int latency_record_count; 13819745512cSArjan van de Ven struct latency_record latency_record[LT_SAVECOUNT]; 13829745512cSArjan van de Ven #endif 13836976675dSArjan van de Ven /* 13846976675dSArjan van de Ven * time slack values; these are used to round up poll() and 13856976675dSArjan van de Ven * select() etc timeout values. These are in nanoseconds. 13866976675dSArjan van de Ven */ 13876976675dSArjan van de Ven unsigned long timer_slack_ns; 13886976675dSArjan van de Ven unsigned long default_timer_slack_ns; 1389f8d570a4SDavid Miller 1390f8d570a4SDavid Miller struct list_head *scm_work_list; 1391fb52607aSFrederic Weisbecker #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1392f201ae23SFrederic Weisbecker /* Index of current stored adress in ret_stack */ 1393f201ae23SFrederic Weisbecker int curr_ret_stack; 1394f201ae23SFrederic Weisbecker /* Stack of return addresses for return function tracing */ 1395f201ae23SFrederic Weisbecker struct ftrace_ret_stack *ret_stack; 1396f201ae23SFrederic Weisbecker /* 1397f201ae23SFrederic Weisbecker * Number of functions that haven't been traced 1398f201ae23SFrederic Weisbecker * because of depth overrun. 1399f201ae23SFrederic Weisbecker */ 1400f201ae23SFrederic Weisbecker atomic_t trace_overrun; 1401380c4b14SFrederic Weisbecker /* Pause for the tracing */ 1402380c4b14SFrederic Weisbecker atomic_t tracing_graph_pause; 1403f201ae23SFrederic Weisbecker #endif 1404ea4e2bc4SSteven Rostedt #ifdef CONFIG_TRACING 1405ea4e2bc4SSteven Rostedt /* state flags for use by tracers */ 1406ea4e2bc4SSteven Rostedt unsigned long trace; 1407ea4e2bc4SSteven Rostedt #endif 14081da177e4SLinus Torvalds }; 14091da177e4SLinus Torvalds 1410e05606d3SIngo Molnar /* 1411e05606d3SIngo Molnar * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1412e05606d3SIngo Molnar * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1413e05606d3SIngo Molnar * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1414e05606d3SIngo Molnar * values are inverted: lower p->prio value means higher priority. 1415e05606d3SIngo Molnar * 1416e05606d3SIngo Molnar * The MAX_USER_RT_PRIO value allows the actual maximum 1417e05606d3SIngo Molnar * RT priority to be separate from the value exported to 1418e05606d3SIngo Molnar * user-space. This allows kernel threads to set their 1419e05606d3SIngo Molnar * priority to a value higher than any user task. Note: 1420e05606d3SIngo Molnar * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1421e05606d3SIngo Molnar */ 1422e05606d3SIngo Molnar 1423e05606d3SIngo Molnar #define MAX_USER_RT_PRIO 100 1424e05606d3SIngo Molnar #define MAX_RT_PRIO MAX_USER_RT_PRIO 1425e05606d3SIngo Molnar 1426e05606d3SIngo Molnar #define MAX_PRIO (MAX_RT_PRIO + 40) 1427e05606d3SIngo Molnar #define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1428e05606d3SIngo Molnar 1429e05606d3SIngo Molnar static inline int rt_prio(int prio) 1430e05606d3SIngo Molnar { 1431e05606d3SIngo Molnar if (unlikely(prio < MAX_RT_PRIO)) 1432e05606d3SIngo Molnar return 1; 1433e05606d3SIngo Molnar return 0; 1434e05606d3SIngo Molnar } 1435e05606d3SIngo Molnar 1436e868171aSAlexey Dobriyan static inline int rt_task(struct task_struct *p) 1437e05606d3SIngo Molnar { 1438e05606d3SIngo Molnar return rt_prio(p->prio); 1439e05606d3SIngo Molnar } 1440e05606d3SIngo Molnar 1441a47afb0fSPavel Emelianov static inline void set_task_session(struct task_struct *tsk, pid_t session) 1442937949d9SCedric Le Goater { 1443a47afb0fSPavel Emelianov tsk->signal->__session = session; 1444937949d9SCedric Le Goater } 1445937949d9SCedric Le Goater 14469a2e7057SPavel Emelyanov static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) 14479a2e7057SPavel Emelyanov { 14489a2e7057SPavel Emelyanov tsk->signal->__pgrp = pgrp; 14499a2e7057SPavel Emelyanov } 14509a2e7057SPavel Emelyanov 1451e868171aSAlexey Dobriyan static inline struct pid *task_pid(struct task_struct *task) 145222c935f4SEric W. Biederman { 145322c935f4SEric W. Biederman return task->pids[PIDTYPE_PID].pid; 145422c935f4SEric W. Biederman } 145522c935f4SEric W. Biederman 1456e868171aSAlexey Dobriyan static inline struct pid *task_tgid(struct task_struct *task) 145722c935f4SEric W. Biederman { 145822c935f4SEric W. Biederman return task->group_leader->pids[PIDTYPE_PID].pid; 145922c935f4SEric W. Biederman } 146022c935f4SEric W. Biederman 1461e868171aSAlexey Dobriyan static inline struct pid *task_pgrp(struct task_struct *task) 146222c935f4SEric W. Biederman { 146322c935f4SEric W. Biederman return task->group_leader->pids[PIDTYPE_PGID].pid; 146422c935f4SEric W. Biederman } 146522c935f4SEric W. Biederman 1466e868171aSAlexey Dobriyan static inline struct pid *task_session(struct task_struct *task) 146722c935f4SEric W. Biederman { 146822c935f4SEric W. Biederman return task->group_leader->pids[PIDTYPE_SID].pid; 146922c935f4SEric W. Biederman } 147022c935f4SEric W. Biederman 14717af57294SPavel Emelyanov struct pid_namespace; 14727af57294SPavel Emelyanov 14737af57294SPavel Emelyanov /* 14747af57294SPavel Emelyanov * the helpers to get the task's different pids as they are seen 14757af57294SPavel Emelyanov * from various namespaces 14767af57294SPavel Emelyanov * 14777af57294SPavel Emelyanov * task_xid_nr() : global id, i.e. the id seen from the init namespace; 147844c4e1b2SEric W. Biederman * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 147944c4e1b2SEric W. Biederman * current. 14807af57294SPavel Emelyanov * task_xid_nr_ns() : id seen from the ns specified; 14817af57294SPavel Emelyanov * 14827af57294SPavel Emelyanov * set_task_vxid() : assigns a virtual id to a task; 14837af57294SPavel Emelyanov * 14847af57294SPavel Emelyanov * see also pid_nr() etc in include/linux/pid.h 14857af57294SPavel Emelyanov */ 14867af57294SPavel Emelyanov 1487e868171aSAlexey Dobriyan static inline pid_t task_pid_nr(struct task_struct *tsk) 14887af57294SPavel Emelyanov { 14897af57294SPavel Emelyanov return tsk->pid; 14907af57294SPavel Emelyanov } 14917af57294SPavel Emelyanov 14922f2a3a46SPavel Emelyanov pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 14937af57294SPavel Emelyanov 14947af57294SPavel Emelyanov static inline pid_t task_pid_vnr(struct task_struct *tsk) 14957af57294SPavel Emelyanov { 14967af57294SPavel Emelyanov return pid_vnr(task_pid(tsk)); 14977af57294SPavel Emelyanov } 14987af57294SPavel Emelyanov 14997af57294SPavel Emelyanov 1500e868171aSAlexey Dobriyan static inline pid_t task_tgid_nr(struct task_struct *tsk) 15017af57294SPavel Emelyanov { 15027af57294SPavel Emelyanov return tsk->tgid; 15037af57294SPavel Emelyanov } 15047af57294SPavel Emelyanov 15052f2a3a46SPavel Emelyanov pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 15067af57294SPavel Emelyanov 15077af57294SPavel Emelyanov static inline pid_t task_tgid_vnr(struct task_struct *tsk) 15087af57294SPavel Emelyanov { 15097af57294SPavel Emelyanov return pid_vnr(task_tgid(tsk)); 15107af57294SPavel Emelyanov } 15117af57294SPavel Emelyanov 15127af57294SPavel Emelyanov 1513e868171aSAlexey Dobriyan static inline pid_t task_pgrp_nr(struct task_struct *tsk) 15147af57294SPavel Emelyanov { 15159a2e7057SPavel Emelyanov return tsk->signal->__pgrp; 15167af57294SPavel Emelyanov } 15177af57294SPavel Emelyanov 15182f2a3a46SPavel Emelyanov pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 15197af57294SPavel Emelyanov 15207af57294SPavel Emelyanov static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 15217af57294SPavel Emelyanov { 15227af57294SPavel Emelyanov return pid_vnr(task_pgrp(tsk)); 15237af57294SPavel Emelyanov } 15247af57294SPavel Emelyanov 15257af57294SPavel Emelyanov 1526e868171aSAlexey Dobriyan static inline pid_t task_session_nr(struct task_struct *tsk) 15277af57294SPavel Emelyanov { 15287af57294SPavel Emelyanov return tsk->signal->__session; 15297af57294SPavel Emelyanov } 15307af57294SPavel Emelyanov 15312f2a3a46SPavel Emelyanov pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 15327af57294SPavel Emelyanov 15337af57294SPavel Emelyanov static inline pid_t task_session_vnr(struct task_struct *tsk) 15347af57294SPavel Emelyanov { 15357af57294SPavel Emelyanov return pid_vnr(task_session(tsk)); 15367af57294SPavel Emelyanov } 15377af57294SPavel Emelyanov 15387af57294SPavel Emelyanov 15391da177e4SLinus Torvalds /** 15401da177e4SLinus Torvalds * pid_alive - check that a task structure is not stale 15411da177e4SLinus Torvalds * @p: Task structure to be checked. 15421da177e4SLinus Torvalds * 15431da177e4SLinus Torvalds * Test if a process is not yet dead (at most zombie state) 15441da177e4SLinus Torvalds * If pid_alive fails, then pointers within the task structure 15451da177e4SLinus Torvalds * can be stale and must not be dereferenced. 15461da177e4SLinus Torvalds */ 1547e868171aSAlexey Dobriyan static inline int pid_alive(struct task_struct *p) 15481da177e4SLinus Torvalds { 154992476d7fSEric W. Biederman return p->pids[PIDTYPE_PID].pid != NULL; 15501da177e4SLinus Torvalds } 15511da177e4SLinus Torvalds 1552f400e198SSukadev Bhattiprolu /** 1553b460cbc5SSerge E. Hallyn * is_global_init - check if a task structure is init 15543260259fSHenne * @tsk: Task structure to be checked. 15553260259fSHenne * 15563260259fSHenne * Check if a task structure is the first user space task the kernel created. 1557f400e198SSukadev Bhattiprolu */ 1558e868171aSAlexey Dobriyan static inline int is_global_init(struct task_struct *tsk) 1559b461cc03SPavel Emelyanov { 1560b461cc03SPavel Emelyanov return tsk->pid == 1; 1561b461cc03SPavel Emelyanov } 1562b460cbc5SSerge E. Hallyn 1563b460cbc5SSerge E. Hallyn /* 1564b460cbc5SSerge E. Hallyn * is_container_init: 1565b460cbc5SSerge E. Hallyn * check whether in the task is init in its own pid namespace. 1566b460cbc5SSerge E. Hallyn */ 1567b461cc03SPavel Emelyanov extern int is_container_init(struct task_struct *tsk); 1568f400e198SSukadev Bhattiprolu 15699ec52099SCedric Le Goater extern struct pid *cad_pid; 15709ec52099SCedric Le Goater 15711da177e4SLinus Torvalds extern void free_task(struct task_struct *tsk); 15721da177e4SLinus Torvalds #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1573e56d0903SIngo Molnar 1574158d9ebdSAndrew Morton extern void __put_task_struct(struct task_struct *t); 1575e56d0903SIngo Molnar 1576e56d0903SIngo Molnar static inline void put_task_struct(struct task_struct *t) 1577e56d0903SIngo Molnar { 1578e56d0903SIngo Molnar if (atomic_dec_and_test(&t->usage)) 15798c7904a0SEric W. Biederman __put_task_struct(t); 1580e56d0903SIngo Molnar } 15811da177e4SLinus Torvalds 158249048622SBalbir Singh extern cputime_t task_utime(struct task_struct *p); 158349048622SBalbir Singh extern cputime_t task_stime(struct task_struct *p); 158449048622SBalbir Singh extern cputime_t task_gtime(struct task_struct *p); 158549048622SBalbir Singh 15861da177e4SLinus Torvalds /* 15871da177e4SLinus Torvalds * Per process flags 15881da177e4SLinus Torvalds */ 15891da177e4SLinus Torvalds #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 15901da177e4SLinus Torvalds /* Not implemented yet, only for 486*/ 15911da177e4SLinus Torvalds #define PF_STARTING 0x00000002 /* being created */ 15921da177e4SLinus Torvalds #define PF_EXITING 0x00000004 /* getting shut down */ 1593778e9a9cSAlexey Kuznetsov #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 159494886b84SLaurent Vivier #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 15951da177e4SLinus Torvalds #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 15961da177e4SLinus Torvalds #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 15971da177e4SLinus Torvalds #define PF_DUMPCORE 0x00000200 /* dumped core */ 15981da177e4SLinus Torvalds #define PF_SIGNALED 0x00000400 /* killed by a signal */ 15991da177e4SLinus Torvalds #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 16001da177e4SLinus Torvalds #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 16011da177e4SLinus Torvalds #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 16021da177e4SLinus Torvalds #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 16031da177e4SLinus Torvalds #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 16041da177e4SLinus Torvalds #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 16051da177e4SLinus Torvalds #define PF_KSWAPD 0x00040000 /* I am kswapd */ 16061da177e4SLinus Torvalds #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 16071da177e4SLinus Torvalds #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1608246bb0b1SOleg Nesterov #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1609b31dc66aSJens Axboe #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1610b31dc66aSJens Axboe #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1611b31dc66aSJens Axboe #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1612b31dc66aSJens Axboe #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 16139985b0baSDavid Rientjes #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1614c61afb18SPaul Jackson #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 161561a87122SThomas Gleixner #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1616ba96a0c8SRafael J. Wysocki #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1617ebb12db5SRafael J. Wysocki #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 16181da177e4SLinus Torvalds 16191da177e4SLinus Torvalds /* 16201da177e4SLinus Torvalds * Only the _current_ task can read/write to tsk->flags, but other 16211da177e4SLinus Torvalds * tasks can access tsk->flags in readonly mode for example 16221da177e4SLinus Torvalds * with tsk_used_math (like during threaded core dumping). 16231da177e4SLinus Torvalds * There is however an exception to this rule during ptrace 16241da177e4SLinus Torvalds * or during fork: the ptracer task is allowed to write to the 16251da177e4SLinus Torvalds * child->flags of its traced child (same goes for fork, the parent 16261da177e4SLinus Torvalds * can write to the child->flags), because we're guaranteed the 16271da177e4SLinus Torvalds * child is not running and in turn not changing child->flags 16281da177e4SLinus Torvalds * at the same time the parent does it. 16291da177e4SLinus Torvalds */ 16301da177e4SLinus Torvalds #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 16311da177e4SLinus Torvalds #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 16321da177e4SLinus Torvalds #define clear_used_math() clear_stopped_child_used_math(current) 16331da177e4SLinus Torvalds #define set_used_math() set_stopped_child_used_math(current) 16341da177e4SLinus Torvalds #define conditional_stopped_child_used_math(condition, child) \ 16351da177e4SLinus Torvalds do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 16361da177e4SLinus Torvalds #define conditional_used_math(condition) \ 16371da177e4SLinus Torvalds conditional_stopped_child_used_math(condition, current) 16381da177e4SLinus Torvalds #define copy_to_stopped_child_used_math(child) \ 16391da177e4SLinus Torvalds do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 16401da177e4SLinus Torvalds /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 16411da177e4SLinus Torvalds #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 16421da177e4SLinus Torvalds #define used_math() tsk_used_math(current) 16431da177e4SLinus Torvalds 16441da177e4SLinus Torvalds #ifdef CONFIG_SMP 1645cd8ba7cdSMike Travis extern int set_cpus_allowed_ptr(struct task_struct *p, 164696f874e2SRusty Russell const struct cpumask *new_mask); 16471da177e4SLinus Torvalds #else 1648cd8ba7cdSMike Travis static inline int set_cpus_allowed_ptr(struct task_struct *p, 164996f874e2SRusty Russell const struct cpumask *new_mask) 16501da177e4SLinus Torvalds { 165196f874e2SRusty Russell if (!cpumask_test_cpu(0, new_mask)) 16521da177e4SLinus Torvalds return -EINVAL; 16531da177e4SLinus Torvalds return 0; 16541da177e4SLinus Torvalds } 16551da177e4SLinus Torvalds #endif 1656cd8ba7cdSMike Travis static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1657cd8ba7cdSMike Travis { 1658cd8ba7cdSMike Travis return set_cpus_allowed_ptr(p, &new_mask); 1659cd8ba7cdSMike Travis } 16601da177e4SLinus Torvalds 16611da177e4SLinus Torvalds extern unsigned long long sched_clock(void); 1662e436d800SIngo Molnar 1663c1955a3dSPeter Zijlstra extern void sched_clock_init(void); 1664c1955a3dSPeter Zijlstra extern u64 sched_clock_cpu(int cpu); 1665c1955a3dSPeter Zijlstra 16663e51f33fSPeter Zijlstra #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 16673e51f33fSPeter Zijlstra static inline void sched_clock_tick(void) 16683e51f33fSPeter Zijlstra { 16693e51f33fSPeter Zijlstra } 16703e51f33fSPeter Zijlstra 16713e51f33fSPeter Zijlstra static inline void sched_clock_idle_sleep_event(void) 16723e51f33fSPeter Zijlstra { 16733e51f33fSPeter Zijlstra } 16743e51f33fSPeter Zijlstra 16753e51f33fSPeter Zijlstra static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 16763e51f33fSPeter Zijlstra { 16773e51f33fSPeter Zijlstra } 1678e4e4e534SIngo Molnar #else 16793e51f33fSPeter Zijlstra extern void sched_clock_tick(void); 16803e51f33fSPeter Zijlstra extern void sched_clock_idle_sleep_event(void); 16813e51f33fSPeter Zijlstra extern void sched_clock_idle_wakeup_event(u64 delta_ns); 16823e51f33fSPeter Zijlstra #endif 16833e51f33fSPeter Zijlstra 1684e436d800SIngo Molnar /* 1685e436d800SIngo Molnar * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1686e436d800SIngo Molnar * clock constructed from sched_clock(): 1687e436d800SIngo Molnar */ 1688e436d800SIngo Molnar extern unsigned long long cpu_clock(int cpu); 1689e436d800SIngo Molnar 169036c8b586SIngo Molnar extern unsigned long long 169141b86e9cSIngo Molnar task_sched_runtime(struct task_struct *task); 1692f06febc9SFrank Mayhar extern unsigned long long thread_group_sched_runtime(struct task_struct *task); 16931da177e4SLinus Torvalds 16941da177e4SLinus Torvalds /* sched_exec is called by processes performing an exec */ 16951da177e4SLinus Torvalds #ifdef CONFIG_SMP 16961da177e4SLinus Torvalds extern void sched_exec(void); 16971da177e4SLinus Torvalds #else 16981da177e4SLinus Torvalds #define sched_exec() {} 16991da177e4SLinus Torvalds #endif 17001da177e4SLinus Torvalds 17012aa44d05SIngo Molnar extern void sched_clock_idle_sleep_event(void); 17022aa44d05SIngo Molnar extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1703bb29ab26SIngo Molnar 17041da177e4SLinus Torvalds #ifdef CONFIG_HOTPLUG_CPU 17051da177e4SLinus Torvalds extern void idle_task_exit(void); 17061da177e4SLinus Torvalds #else 17071da177e4SLinus Torvalds static inline void idle_task_exit(void) {} 17081da177e4SLinus Torvalds #endif 17091da177e4SLinus Torvalds 17101da177e4SLinus Torvalds extern void sched_idle_next(void); 1711b29739f9SIngo Molnar 171206d8308cSThomas Gleixner #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 171306d8308cSThomas Gleixner extern void wake_up_idle_cpu(int cpu); 171406d8308cSThomas Gleixner #else 171506d8308cSThomas Gleixner static inline void wake_up_idle_cpu(int cpu) { } 171606d8308cSThomas Gleixner #endif 171706d8308cSThomas Gleixner 171821805085SPeter Zijlstra extern unsigned int sysctl_sched_latency; 1719b2be5e96SPeter Zijlstra extern unsigned int sysctl_sched_min_granularity; 1720bf0f6f24SIngo Molnar extern unsigned int sysctl_sched_wakeup_granularity; 172147fea2adSJaswinder Singh Rajput extern unsigned int sysctl_sched_shares_ratelimit; 172247fea2adSJaswinder Singh Rajput extern unsigned int sysctl_sched_shares_thresh; 172347fea2adSJaswinder Singh Rajput #ifdef CONFIG_SCHED_DEBUG 1724bf0f6f24SIngo Molnar extern unsigned int sysctl_sched_child_runs_first; 1725bf0f6f24SIngo Molnar extern unsigned int sysctl_sched_features; 1726da84d961SIngo Molnar extern unsigned int sysctl_sched_migration_cost; 1727b82d9fddSPeter Zijlstra extern unsigned int sysctl_sched_nr_migrate; 1728b2be5e96SPeter Zijlstra 1729b2be5e96SPeter Zijlstra int sched_nr_latency_handler(struct ctl_table *table, int write, 1730b2be5e96SPeter Zijlstra struct file *file, void __user *buffer, size_t *length, 1731b2be5e96SPeter Zijlstra loff_t *ppos); 17322bd8e6d4SIngo Molnar #endif 17339f0c1e56SPeter Zijlstra extern unsigned int sysctl_sched_rt_period; 17349f0c1e56SPeter Zijlstra extern int sysctl_sched_rt_runtime; 17352bd8e6d4SIngo Molnar 1736d0b27fa7SPeter Zijlstra int sched_rt_handler(struct ctl_table *table, int write, 1737d0b27fa7SPeter Zijlstra struct file *filp, void __user *buffer, size_t *lenp, 1738d0b27fa7SPeter Zijlstra loff_t *ppos); 1739d0b27fa7SPeter Zijlstra 17402bd8e6d4SIngo Molnar extern unsigned int sysctl_sched_compat_yield; 1741bf0f6f24SIngo Molnar 1742b29739f9SIngo Molnar #ifdef CONFIG_RT_MUTEXES 174336c8b586SIngo Molnar extern int rt_mutex_getprio(struct task_struct *p); 174436c8b586SIngo Molnar extern void rt_mutex_setprio(struct task_struct *p, int prio); 174536c8b586SIngo Molnar extern void rt_mutex_adjust_pi(struct task_struct *p); 1746b29739f9SIngo Molnar #else 1747e868171aSAlexey Dobriyan static inline int rt_mutex_getprio(struct task_struct *p) 1748b29739f9SIngo Molnar { 1749b29739f9SIngo Molnar return p->normal_prio; 1750b29739f9SIngo Molnar } 175195e02ca9SThomas Gleixner # define rt_mutex_adjust_pi(p) do { } while (0) 1752b29739f9SIngo Molnar #endif 1753b29739f9SIngo Molnar 175436c8b586SIngo Molnar extern void set_user_nice(struct task_struct *p, long nice); 175536c8b586SIngo Molnar extern int task_prio(const struct task_struct *p); 175636c8b586SIngo Molnar extern int task_nice(const struct task_struct *p); 175736c8b586SIngo Molnar extern int can_nice(const struct task_struct *p, const int nice); 175836c8b586SIngo Molnar extern int task_curr(const struct task_struct *p); 17591da177e4SLinus Torvalds extern int idle_cpu(int cpu); 17601da177e4SLinus Torvalds extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1761961ccdddSRusty Russell extern int sched_setscheduler_nocheck(struct task_struct *, int, 1762961ccdddSRusty Russell struct sched_param *); 176336c8b586SIngo Molnar extern struct task_struct *idle_task(int cpu); 176436c8b586SIngo Molnar extern struct task_struct *curr_task(int cpu); 176536c8b586SIngo Molnar extern void set_curr_task(int cpu, struct task_struct *p); 17661da177e4SLinus Torvalds 17671da177e4SLinus Torvalds void yield(void); 17681da177e4SLinus Torvalds 17691da177e4SLinus Torvalds /* 17701da177e4SLinus Torvalds * The default (Linux) execution domain. 17711da177e4SLinus Torvalds */ 17721da177e4SLinus Torvalds extern struct exec_domain default_exec_domain; 17731da177e4SLinus Torvalds 17741da177e4SLinus Torvalds union thread_union { 17751da177e4SLinus Torvalds struct thread_info thread_info; 17761da177e4SLinus Torvalds unsigned long stack[THREAD_SIZE/sizeof(long)]; 17771da177e4SLinus Torvalds }; 17781da177e4SLinus Torvalds 17791da177e4SLinus Torvalds #ifndef __HAVE_ARCH_KSTACK_END 17801da177e4SLinus Torvalds static inline int kstack_end(void *addr) 17811da177e4SLinus Torvalds { 17821da177e4SLinus Torvalds /* Reliable end of stack detection: 17831da177e4SLinus Torvalds * Some APM bios versions misalign the stack 17841da177e4SLinus Torvalds */ 17851da177e4SLinus Torvalds return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 17861da177e4SLinus Torvalds } 17871da177e4SLinus Torvalds #endif 17881da177e4SLinus Torvalds 17891da177e4SLinus Torvalds extern union thread_union init_thread_union; 17901da177e4SLinus Torvalds extern struct task_struct init_task; 17911da177e4SLinus Torvalds 17921da177e4SLinus Torvalds extern struct mm_struct init_mm; 17931da177e4SLinus Torvalds 1794198fe21bSPavel Emelyanov extern struct pid_namespace init_pid_ns; 1795198fe21bSPavel Emelyanov 1796198fe21bSPavel Emelyanov /* 1797198fe21bSPavel Emelyanov * find a task by one of its numerical ids 1798198fe21bSPavel Emelyanov * 1799198fe21bSPavel Emelyanov * find_task_by_pid_type_ns(): 1800198fe21bSPavel Emelyanov * it is the most generic call - it finds a task by all id, 1801198fe21bSPavel Emelyanov * type and namespace specified 1802198fe21bSPavel Emelyanov * find_task_by_pid_ns(): 1803198fe21bSPavel Emelyanov * finds a task by its pid in the specified namespace 1804228ebcbeSPavel Emelyanov * find_task_by_vpid(): 1805228ebcbeSPavel Emelyanov * finds a task by its virtual pid 1806198fe21bSPavel Emelyanov * 1807e49859e7SPavel Emelyanov * see also find_vpid() etc in include/linux/pid.h 1808198fe21bSPavel Emelyanov */ 1809198fe21bSPavel Emelyanov 1810198fe21bSPavel Emelyanov extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, 1811198fe21bSPavel Emelyanov struct pid_namespace *ns); 1812198fe21bSPavel Emelyanov 1813228ebcbeSPavel Emelyanov extern struct task_struct *find_task_by_vpid(pid_t nr); 1814228ebcbeSPavel Emelyanov extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1815228ebcbeSPavel Emelyanov struct pid_namespace *ns); 1816198fe21bSPavel Emelyanov 18178520d7c7SOleg Nesterov extern void __set_special_pids(struct pid *pid); 18181da177e4SLinus Torvalds 18191da177e4SLinus Torvalds /* per-UID process charging. */ 1820acce292cSCedric Le Goater extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 18211da177e4SLinus Torvalds static inline struct user_struct *get_uid(struct user_struct *u) 18221da177e4SLinus Torvalds { 18231da177e4SLinus Torvalds atomic_inc(&u->__count); 18241da177e4SLinus Torvalds return u; 18251da177e4SLinus Torvalds } 18261da177e4SLinus Torvalds extern void free_uid(struct user_struct *); 182728f300d2SPavel Emelyanov extern void release_uids(struct user_namespace *ns); 18281da177e4SLinus Torvalds 18291da177e4SLinus Torvalds #include <asm/current.h> 18301da177e4SLinus Torvalds 18313171a030SAtsushi Nemoto extern void do_timer(unsigned long ticks); 18321da177e4SLinus Torvalds 1833b3c97528SHarvey Harrison extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1834b3c97528SHarvey Harrison extern int wake_up_process(struct task_struct *tsk); 1835b3c97528SHarvey Harrison extern void wake_up_new_task(struct task_struct *tsk, 1836b3c97528SHarvey Harrison unsigned long clone_flags); 18371da177e4SLinus Torvalds #ifdef CONFIG_SMP 18381da177e4SLinus Torvalds extern void kick_process(struct task_struct *tsk); 18391da177e4SLinus Torvalds #else 18401da177e4SLinus Torvalds static inline void kick_process(struct task_struct *tsk) { } 18411da177e4SLinus Torvalds #endif 1842ad46c2c4SIngo Molnar extern void sched_fork(struct task_struct *p, int clone_flags); 1843ad46c2c4SIngo Molnar extern void sched_dead(struct task_struct *p); 18441da177e4SLinus Torvalds 18451da177e4SLinus Torvalds extern void proc_caches_init(void); 18461da177e4SLinus Torvalds extern void flush_signals(struct task_struct *); 184710ab825bSOleg Nesterov extern void ignore_signals(struct task_struct *); 18481da177e4SLinus Torvalds extern void flush_signal_handlers(struct task_struct *, int force_default); 18491da177e4SLinus Torvalds extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 18501da177e4SLinus Torvalds 18511da177e4SLinus Torvalds static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 18521da177e4SLinus Torvalds { 18531da177e4SLinus Torvalds unsigned long flags; 18541da177e4SLinus Torvalds int ret; 18551da177e4SLinus Torvalds 18561da177e4SLinus Torvalds spin_lock_irqsave(&tsk->sighand->siglock, flags); 18571da177e4SLinus Torvalds ret = dequeue_signal(tsk, mask, info); 18581da177e4SLinus Torvalds spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 18591da177e4SLinus Torvalds 18601da177e4SLinus Torvalds return ret; 18611da177e4SLinus Torvalds } 18621da177e4SLinus Torvalds 18631da177e4SLinus Torvalds extern void block_all_signals(int (*notifier)(void *priv), void *priv, 18641da177e4SLinus Torvalds sigset_t *mask); 18651da177e4SLinus Torvalds extern void unblock_all_signals(void); 18661da177e4SLinus Torvalds extern void release_task(struct task_struct * p); 18671da177e4SLinus Torvalds extern int send_sig_info(int, struct siginfo *, struct task_struct *); 18681da177e4SLinus Torvalds extern int force_sigsegv(int, struct task_struct *); 18691da177e4SLinus Torvalds extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1870c4b92fc1SEric W. Biederman extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1871c4b92fc1SEric W. Biederman extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 18722425c08bSEric W. Biederman extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1873c4b92fc1SEric W. Biederman extern int kill_pgrp(struct pid *pid, int sig, int priv); 1874c4b92fc1SEric W. Biederman extern int kill_pid(struct pid *pid, int sig, int priv); 1875c3de4b38SMatthew Wilcox extern int kill_proc_info(int, struct siginfo *, pid_t); 18762b2a1ff6SRoland McGrath extern int do_notify_parent(struct task_struct *, int); 18771da177e4SLinus Torvalds extern void force_sig(int, struct task_struct *); 18781da177e4SLinus Torvalds extern void force_sig_specific(int, struct task_struct *); 18791da177e4SLinus Torvalds extern int send_sig(int, struct task_struct *, int); 18801da177e4SLinus Torvalds extern void zap_other_threads(struct task_struct *p); 18811da177e4SLinus Torvalds extern struct sigqueue *sigqueue_alloc(void); 18821da177e4SLinus Torvalds extern void sigqueue_free(struct sigqueue *); 1883ac5c2153SOleg Nesterov extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 18849ac95f2fSOleg Nesterov extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 18851da177e4SLinus Torvalds extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 18861da177e4SLinus Torvalds 18879ec52099SCedric Le Goater static inline int kill_cad_pid(int sig, int priv) 18889ec52099SCedric Le Goater { 18899ec52099SCedric Le Goater return kill_pid(cad_pid, sig, priv); 18909ec52099SCedric Le Goater } 18919ec52099SCedric Le Goater 18921da177e4SLinus Torvalds /* These can be the second arg to send_sig_info/send_group_sig_info. */ 18931da177e4SLinus Torvalds #define SEND_SIG_NOINFO ((struct siginfo *) 0) 18941da177e4SLinus Torvalds #define SEND_SIG_PRIV ((struct siginfo *) 1) 18951da177e4SLinus Torvalds #define SEND_SIG_FORCED ((struct siginfo *) 2) 18961da177e4SLinus Torvalds 1897621d3121SOleg Nesterov static inline int is_si_special(const struct siginfo *info) 1898621d3121SOleg Nesterov { 1899621d3121SOleg Nesterov return info <= SEND_SIG_FORCED; 1900621d3121SOleg Nesterov } 1901621d3121SOleg Nesterov 19021da177e4SLinus Torvalds /* True if we are on the alternate signal stack. */ 19031da177e4SLinus Torvalds 19041da177e4SLinus Torvalds static inline int on_sig_stack(unsigned long sp) 19051da177e4SLinus Torvalds { 19061da177e4SLinus Torvalds return (sp - current->sas_ss_sp < current->sas_ss_size); 19071da177e4SLinus Torvalds } 19081da177e4SLinus Torvalds 19091da177e4SLinus Torvalds static inline int sas_ss_flags(unsigned long sp) 19101da177e4SLinus Torvalds { 19111da177e4SLinus Torvalds return (current->sas_ss_size == 0 ? SS_DISABLE 19121da177e4SLinus Torvalds : on_sig_stack(sp) ? SS_ONSTACK : 0); 19131da177e4SLinus Torvalds } 19141da177e4SLinus Torvalds 19151da177e4SLinus Torvalds /* 19161da177e4SLinus Torvalds * Routines for handling mm_structs 19171da177e4SLinus Torvalds */ 19181da177e4SLinus Torvalds extern struct mm_struct * mm_alloc(void); 19191da177e4SLinus Torvalds 19201da177e4SLinus Torvalds /* mmdrop drops the mm and the page tables */ 1921b3c97528SHarvey Harrison extern void __mmdrop(struct mm_struct *); 19221da177e4SLinus Torvalds static inline void mmdrop(struct mm_struct * mm) 19231da177e4SLinus Torvalds { 19246fb43d7bSIngo Molnar if (unlikely(atomic_dec_and_test(&mm->mm_count))) 19251da177e4SLinus Torvalds __mmdrop(mm); 19261da177e4SLinus Torvalds } 19271da177e4SLinus Torvalds 19281da177e4SLinus Torvalds /* mmput gets rid of the mappings and all user-space */ 19291da177e4SLinus Torvalds extern void mmput(struct mm_struct *); 19301da177e4SLinus Torvalds /* Grab a reference to a task's mm, if it is not already going away */ 19311da177e4SLinus Torvalds extern struct mm_struct *get_task_mm(struct task_struct *task); 19321da177e4SLinus Torvalds /* Remove the current tasks stale references to the old mm_struct */ 19331da177e4SLinus Torvalds extern void mm_release(struct task_struct *, struct mm_struct *); 1934402b0862SCarsten Otte /* Allocate a new mm structure and copy contents from tsk->mm */ 1935402b0862SCarsten Otte extern struct mm_struct *dup_mm(struct task_struct *tsk); 19361da177e4SLinus Torvalds 19371da177e4SLinus Torvalds extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 19381da177e4SLinus Torvalds extern void flush_thread(void); 19391da177e4SLinus Torvalds extern void exit_thread(void); 19401da177e4SLinus Torvalds 19411da177e4SLinus Torvalds extern void exit_files(struct task_struct *); 19426b3934efSOleg Nesterov extern void __cleanup_signal(struct signal_struct *); 1943a7e5328aSOleg Nesterov extern void __cleanup_sighand(struct sighand_struct *); 1944cbaffba1SOleg Nesterov 19451da177e4SLinus Torvalds extern void exit_itimers(struct signal_struct *); 1946cbaffba1SOleg Nesterov extern void flush_itimer_signals(void); 19471da177e4SLinus Torvalds 19481da177e4SLinus Torvalds extern NORET_TYPE void do_group_exit(int); 19491da177e4SLinus Torvalds 19501da177e4SLinus Torvalds extern void daemonize(const char *, ...); 19511da177e4SLinus Torvalds extern int allow_signal(int); 19521da177e4SLinus Torvalds extern int disallow_signal(int); 19531da177e4SLinus Torvalds 19541da177e4SLinus Torvalds extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 19551da177e4SLinus Torvalds extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 195636c8b586SIngo Molnar struct task_struct *fork_idle(int); 19571da177e4SLinus Torvalds 19581da177e4SLinus Torvalds extern void set_task_comm(struct task_struct *tsk, char *from); 195959714d65SAndrew Morton extern char *get_task_comm(char *to, struct task_struct *tsk); 19601da177e4SLinus Torvalds 19611da177e4SLinus Torvalds #ifdef CONFIG_SMP 196285ba2d86SRoland McGrath extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 19631da177e4SLinus Torvalds #else 196485ba2d86SRoland McGrath static inline unsigned long wait_task_inactive(struct task_struct *p, 196585ba2d86SRoland McGrath long match_state) 196685ba2d86SRoland McGrath { 196785ba2d86SRoland McGrath return 1; 196885ba2d86SRoland McGrath } 19691da177e4SLinus Torvalds #endif 19701da177e4SLinus Torvalds 19715e85d4abSEric W. Biederman #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 19721da177e4SLinus Torvalds 19731da177e4SLinus Torvalds #define for_each_process(p) \ 19741da177e4SLinus Torvalds for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 19751da177e4SLinus Torvalds 1976d84f4f99SDavid Howells extern bool is_single_threaded(struct task_struct *); 1977d84f4f99SDavid Howells 19781da177e4SLinus Torvalds /* 19791da177e4SLinus Torvalds * Careful: do_each_thread/while_each_thread is a double loop so 19801da177e4SLinus Torvalds * 'break' will not work as expected - use goto instead. 19811da177e4SLinus Torvalds */ 19821da177e4SLinus Torvalds #define do_each_thread(g, t) \ 19831da177e4SLinus Torvalds for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 19841da177e4SLinus Torvalds 19851da177e4SLinus Torvalds #define while_each_thread(g, t) \ 19861da177e4SLinus Torvalds while ((t = next_thread(t)) != g) 19871da177e4SLinus Torvalds 1988de12a787SEric W. Biederman /* de_thread depends on thread_group_leader not being a pid based check */ 1989de12a787SEric W. Biederman #define thread_group_leader(p) (p == p->group_leader) 19901da177e4SLinus Torvalds 19910804ef4bSEric W. Biederman /* Do to the insanities of de_thread it is possible for a process 19920804ef4bSEric W. Biederman * to have the pid of the thread group leader without actually being 19930804ef4bSEric W. Biederman * the thread group leader. For iteration through the pids in proc 19940804ef4bSEric W. Biederman * all we care about is that we have a task with the appropriate 19950804ef4bSEric W. Biederman * pid, we don't actually care if we have the right task. 19960804ef4bSEric W. Biederman */ 1997e868171aSAlexey Dobriyan static inline int has_group_leader_pid(struct task_struct *p) 19980804ef4bSEric W. Biederman { 19990804ef4bSEric W. Biederman return p->pid == p->tgid; 20000804ef4bSEric W. Biederman } 20010804ef4bSEric W. Biederman 2002bac0abd6SPavel Emelyanov static inline 2003bac0abd6SPavel Emelyanov int same_thread_group(struct task_struct *p1, struct task_struct *p2) 2004bac0abd6SPavel Emelyanov { 2005bac0abd6SPavel Emelyanov return p1->tgid == p2->tgid; 2006bac0abd6SPavel Emelyanov } 2007bac0abd6SPavel Emelyanov 200836c8b586SIngo Molnar static inline struct task_struct *next_thread(const struct task_struct *p) 200947e65328SOleg Nesterov { 201047e65328SOleg Nesterov return list_entry(rcu_dereference(p->thread_group.next), 201136c8b586SIngo Molnar struct task_struct, thread_group); 201247e65328SOleg Nesterov } 201347e65328SOleg Nesterov 2014e868171aSAlexey Dobriyan static inline int thread_group_empty(struct task_struct *p) 20151da177e4SLinus Torvalds { 201647e65328SOleg Nesterov return list_empty(&p->thread_group); 20171da177e4SLinus Torvalds } 20181da177e4SLinus Torvalds 20191da177e4SLinus Torvalds #define delay_group_leader(p) \ 20201da177e4SLinus Torvalds (thread_group_leader(p) && !thread_group_empty(p)) 20211da177e4SLinus Torvalds 20221da177e4SLinus Torvalds /* 2023260ea101SEric W. Biederman * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 202422e2c507SJens Axboe * subscriptions and synchronises with wait4(). Also used in procfs. Also 2025ddbcc7e8SPaul Menage * pins the final release of task.io_context. Also protects ->cpuset and 2026ddbcc7e8SPaul Menage * ->cgroup.subsys[]. 20271da177e4SLinus Torvalds * 20281da177e4SLinus Torvalds * Nests both inside and outside of read_lock(&tasklist_lock). 20291da177e4SLinus Torvalds * It must not be nested with write_lock_irq(&tasklist_lock), 20301da177e4SLinus Torvalds * neither inside nor outside. 20311da177e4SLinus Torvalds */ 20321da177e4SLinus Torvalds static inline void task_lock(struct task_struct *p) 20331da177e4SLinus Torvalds { 20341da177e4SLinus Torvalds spin_lock(&p->alloc_lock); 20351da177e4SLinus Torvalds } 20361da177e4SLinus Torvalds 20371da177e4SLinus Torvalds static inline void task_unlock(struct task_struct *p) 20381da177e4SLinus Torvalds { 20391da177e4SLinus Torvalds spin_unlock(&p->alloc_lock); 20401da177e4SLinus Torvalds } 20411da177e4SLinus Torvalds 2042f63ee72eSOleg Nesterov extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 2043f63ee72eSOleg Nesterov unsigned long *flags); 2044f63ee72eSOleg Nesterov 2045f63ee72eSOleg Nesterov static inline void unlock_task_sighand(struct task_struct *tsk, 2046f63ee72eSOleg Nesterov unsigned long *flags) 2047f63ee72eSOleg Nesterov { 2048f63ee72eSOleg Nesterov spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2049f63ee72eSOleg Nesterov } 2050f63ee72eSOleg Nesterov 2051f037360fSAl Viro #ifndef __HAVE_THREAD_FUNCTIONS 2052f037360fSAl Viro 2053f7e4217bSRoman Zippel #define task_thread_info(task) ((struct thread_info *)(task)->stack) 2054f7e4217bSRoman Zippel #define task_stack_page(task) ((task)->stack) 2055a1261f54SAl Viro 205610ebffdeSAl Viro static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 205710ebffdeSAl Viro { 205810ebffdeSAl Viro *task_thread_info(p) = *task_thread_info(org); 205910ebffdeSAl Viro task_thread_info(p)->task = p; 206010ebffdeSAl Viro } 206110ebffdeSAl Viro 206210ebffdeSAl Viro static inline unsigned long *end_of_stack(struct task_struct *p) 206310ebffdeSAl Viro { 2064f7e4217bSRoman Zippel return (unsigned long *)(task_thread_info(p) + 1); 206510ebffdeSAl Viro } 206610ebffdeSAl Viro 2067f037360fSAl Viro #endif 2068f037360fSAl Viro 20698b05c7e6SFUJITA Tomonori static inline int object_is_on_stack(void *obj) 20708b05c7e6SFUJITA Tomonori { 20718b05c7e6SFUJITA Tomonori void *stack = task_stack_page(current); 20728b05c7e6SFUJITA Tomonori 20738b05c7e6SFUJITA Tomonori return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 20748b05c7e6SFUJITA Tomonori } 20758b05c7e6SFUJITA Tomonori 20768c9843e5SBenjamin Herrenschmidt extern void thread_info_cache_init(void); 20778c9843e5SBenjamin Herrenschmidt 20781da177e4SLinus Torvalds /* set thread flags in other task's structures 20791da177e4SLinus Torvalds * - see asm/thread_info.h for TIF_xxxx flags available 20801da177e4SLinus Torvalds */ 20811da177e4SLinus Torvalds static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 20821da177e4SLinus Torvalds { 2083a1261f54SAl Viro set_ti_thread_flag(task_thread_info(tsk), flag); 20841da177e4SLinus Torvalds } 20851da177e4SLinus Torvalds 20861da177e4SLinus Torvalds static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 20871da177e4SLinus Torvalds { 2088a1261f54SAl Viro clear_ti_thread_flag(task_thread_info(tsk), flag); 20891da177e4SLinus Torvalds } 20901da177e4SLinus Torvalds 20911da177e4SLinus Torvalds static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 20921da177e4SLinus Torvalds { 2093a1261f54SAl Viro return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 20941da177e4SLinus Torvalds } 20951da177e4SLinus Torvalds 20961da177e4SLinus Torvalds static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 20971da177e4SLinus Torvalds { 2098a1261f54SAl Viro return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 20991da177e4SLinus Torvalds } 21001da177e4SLinus Torvalds 21011da177e4SLinus Torvalds static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 21021da177e4SLinus Torvalds { 2103a1261f54SAl Viro return test_ti_thread_flag(task_thread_info(tsk), flag); 21041da177e4SLinus Torvalds } 21051da177e4SLinus Torvalds 21061da177e4SLinus Torvalds static inline void set_tsk_need_resched(struct task_struct *tsk) 21071da177e4SLinus Torvalds { 21081da177e4SLinus Torvalds set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 21091da177e4SLinus Torvalds } 21101da177e4SLinus Torvalds 21111da177e4SLinus Torvalds static inline void clear_tsk_need_resched(struct task_struct *tsk) 21121da177e4SLinus Torvalds { 21131da177e4SLinus Torvalds clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 21141da177e4SLinus Torvalds } 21151da177e4SLinus Torvalds 21168ae121acSGregory Haskins static inline int test_tsk_need_resched(struct task_struct *tsk) 21178ae121acSGregory Haskins { 21188ae121acSGregory Haskins return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 21198ae121acSGregory Haskins } 21208ae121acSGregory Haskins 21211da177e4SLinus Torvalds static inline int signal_pending(struct task_struct *p) 21221da177e4SLinus Torvalds { 21231da177e4SLinus Torvalds return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 21241da177e4SLinus Torvalds } 21251da177e4SLinus Torvalds 2126b3c97528SHarvey Harrison extern int __fatal_signal_pending(struct task_struct *p); 2127f776d12dSMatthew Wilcox 2128f776d12dSMatthew Wilcox static inline int fatal_signal_pending(struct task_struct *p) 2129f776d12dSMatthew Wilcox { 2130f776d12dSMatthew Wilcox return signal_pending(p) && __fatal_signal_pending(p); 2131f776d12dSMatthew Wilcox } 2132f776d12dSMatthew Wilcox 213316882c1eSOleg Nesterov static inline int signal_pending_state(long state, struct task_struct *p) 213416882c1eSOleg Nesterov { 213516882c1eSOleg Nesterov if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 213616882c1eSOleg Nesterov return 0; 213716882c1eSOleg Nesterov if (!signal_pending(p)) 213816882c1eSOleg Nesterov return 0; 213916882c1eSOleg Nesterov 214016882c1eSOleg Nesterov return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 214116882c1eSOleg Nesterov } 214216882c1eSOleg Nesterov 21431da177e4SLinus Torvalds static inline int need_resched(void) 21441da177e4SLinus Torvalds { 21459404ef02SLinus Torvalds return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 21461da177e4SLinus Torvalds } 21471da177e4SLinus Torvalds 21481da177e4SLinus Torvalds /* 21491da177e4SLinus Torvalds * cond_resched() and cond_resched_lock(): latency reduction via 21501da177e4SLinus Torvalds * explicit rescheduling in places that are safe. The return 21511da177e4SLinus Torvalds * value indicates whether a reschedule was done in fact. 21521da177e4SLinus Torvalds * cond_resched_lock() will drop the spinlock before scheduling, 21531da177e4SLinus Torvalds * cond_resched_softirq() will enable bhs before scheduling. 21541da177e4SLinus Torvalds */ 2155c3921ab7SLinus Torvalds extern int _cond_resched(void); 2156c714a534SLinus Torvalds #ifdef CONFIG_PREEMPT_BKL 215702b67cc3SHerbert Xu static inline int cond_resched(void) 215802b67cc3SHerbert Xu { 215902b67cc3SHerbert Xu return 0; 216002b67cc3SHerbert Xu } 216102b67cc3SHerbert Xu #else 216202b67cc3SHerbert Xu static inline int cond_resched(void) 216302b67cc3SHerbert Xu { 216402b67cc3SHerbert Xu return _cond_resched(); 216502b67cc3SHerbert Xu } 216602b67cc3SHerbert Xu #endif 21671da177e4SLinus Torvalds extern int cond_resched_lock(spinlock_t * lock); 21681da177e4SLinus Torvalds extern int cond_resched_softirq(void); 2169c3921ab7SLinus Torvalds static inline int cond_resched_bkl(void) 2170c3921ab7SLinus Torvalds { 2171c3921ab7SLinus Torvalds return _cond_resched(); 2172c3921ab7SLinus Torvalds } 21731da177e4SLinus Torvalds 21741da177e4SLinus Torvalds /* 21751da177e4SLinus Torvalds * Does a critical section need to be broken due to another 217695c354feSNick Piggin * task waiting?: (technically does not depend on CONFIG_PREEMPT, 217795c354feSNick Piggin * but a general need for low latency) 21781da177e4SLinus Torvalds */ 217995c354feSNick Piggin static inline int spin_needbreak(spinlock_t *lock) 21801da177e4SLinus Torvalds { 218195c354feSNick Piggin #ifdef CONFIG_PREEMPT 218295c354feSNick Piggin return spin_is_contended(lock); 218395c354feSNick Piggin #else 21841da177e4SLinus Torvalds return 0; 218595c354feSNick Piggin #endif 21861da177e4SLinus Torvalds } 21871da177e4SLinus Torvalds 21887bb44adeSRoland McGrath /* 2189f06febc9SFrank Mayhar * Thread group CPU time accounting. 2190f06febc9SFrank Mayhar */ 2191f06febc9SFrank Mayhar 2192bb34d92fSFrank Mayhar extern int thread_group_cputime_alloc(struct task_struct *); 2193bb34d92fSFrank Mayhar extern void thread_group_cputime(struct task_struct *, struct task_cputime *); 2194f06febc9SFrank Mayhar 2195f06febc9SFrank Mayhar static inline void thread_group_cputime_init(struct signal_struct *sig) 2196f06febc9SFrank Mayhar { 2197f06febc9SFrank Mayhar sig->cputime.totals = NULL; 2198f06febc9SFrank Mayhar } 2199f06febc9SFrank Mayhar 2200bb34d92fSFrank Mayhar static inline int thread_group_cputime_clone_thread(struct task_struct *curr) 2201f06febc9SFrank Mayhar { 2202f06febc9SFrank Mayhar if (curr->signal->cputime.totals) 2203f06febc9SFrank Mayhar return 0; 2204bb34d92fSFrank Mayhar return thread_group_cputime_alloc(curr); 2205f06febc9SFrank Mayhar } 2206f06febc9SFrank Mayhar 2207f06febc9SFrank Mayhar static inline void thread_group_cputime_free(struct signal_struct *sig) 2208f06febc9SFrank Mayhar { 2209f06febc9SFrank Mayhar free_percpu(sig->cputime.totals); 2210f06febc9SFrank Mayhar } 2211f06febc9SFrank Mayhar 2212f06febc9SFrank Mayhar /* 22137bb44adeSRoland McGrath * Reevaluate whether the task has signals pending delivery. 22147bb44adeSRoland McGrath * Wake the task if so. 22157bb44adeSRoland McGrath * This is required every time the blocked sigset_t changes. 22167bb44adeSRoland McGrath * callers must hold sighand->siglock. 22177bb44adeSRoland McGrath */ 22187bb44adeSRoland McGrath extern void recalc_sigpending_and_wake(struct task_struct *t); 22191da177e4SLinus Torvalds extern void recalc_sigpending(void); 22201da177e4SLinus Torvalds 22211da177e4SLinus Torvalds extern void signal_wake_up(struct task_struct *t, int resume_stopped); 22221da177e4SLinus Torvalds 22231da177e4SLinus Torvalds /* 22241da177e4SLinus Torvalds * Wrappers for p->thread_info->cpu access. No-op on UP. 22251da177e4SLinus Torvalds */ 22261da177e4SLinus Torvalds #ifdef CONFIG_SMP 22271da177e4SLinus Torvalds 22281da177e4SLinus Torvalds static inline unsigned int task_cpu(const struct task_struct *p) 22291da177e4SLinus Torvalds { 2230a1261f54SAl Viro return task_thread_info(p)->cpu; 22311da177e4SLinus Torvalds } 22321da177e4SLinus Torvalds 2233c65cc870SIngo Molnar extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 22341da177e4SLinus Torvalds 22351da177e4SLinus Torvalds #else 22361da177e4SLinus Torvalds 22371da177e4SLinus Torvalds static inline unsigned int task_cpu(const struct task_struct *p) 22381da177e4SLinus Torvalds { 22391da177e4SLinus Torvalds return 0; 22401da177e4SLinus Torvalds } 22411da177e4SLinus Torvalds 22421da177e4SLinus Torvalds static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 22431da177e4SLinus Torvalds { 22441da177e4SLinus Torvalds } 22451da177e4SLinus Torvalds 22461da177e4SLinus Torvalds #endif /* CONFIG_SMP */ 22471da177e4SLinus Torvalds 22481da177e4SLinus Torvalds extern void arch_pick_mmap_layout(struct mm_struct *mm); 22491da177e4SLinus Torvalds 22501a3c3034SIngo Molnar #ifdef CONFIG_TRACING 22511a3c3034SIngo Molnar extern void 22521a3c3034SIngo Molnar __trace_special(void *__tr, void *__data, 22531a3c3034SIngo Molnar unsigned long arg1, unsigned long arg2, unsigned long arg3); 22541a3c3034SIngo Molnar #else 22551a3c3034SIngo Molnar static inline void 22561a3c3034SIngo Molnar __trace_special(void *__tr, void *__data, 22571a3c3034SIngo Molnar unsigned long arg1, unsigned long arg2, unsigned long arg3) 22581a3c3034SIngo Molnar { 22591a3c3034SIngo Molnar } 22601a3c3034SIngo Molnar #endif 22611a3c3034SIngo Molnar 226296f874e2SRusty Russell extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); 226396f874e2SRusty Russell extern long sched_getaffinity(pid_t pid, struct cpumask *mask); 22645c45bf27SSiddha, Suresh B 22651da177e4SLinus Torvalds extern void normalize_rt_tasks(void); 22661da177e4SLinus Torvalds 2267052f1dc7SPeter Zijlstra #ifdef CONFIG_GROUP_SCHED 22689b5b7751SSrivatsa Vaddagiri 22694cf86d77SIngo Molnar extern struct task_group init_task_group; 2270eff766a6SPeter Zijlstra #ifdef CONFIG_USER_SCHED 2271eff766a6SPeter Zijlstra extern struct task_group root_task_group; 22726c415b92SArun R Bharadwaj extern void set_tg_uid(struct user_struct *user); 2273eff766a6SPeter Zijlstra #endif 22749b5b7751SSrivatsa Vaddagiri 2275ec7dc8acSDhaval Giani extern struct task_group *sched_create_group(struct task_group *parent); 22764cf86d77SIngo Molnar extern void sched_destroy_group(struct task_group *tg); 22779b5b7751SSrivatsa Vaddagiri extern void sched_move_task(struct task_struct *tsk); 2278052f1dc7SPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 22794cf86d77SIngo Molnar extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 22805cb350baSDhaval Giani extern unsigned long sched_group_shares(struct task_group *tg); 2281052f1dc7SPeter Zijlstra #endif 2282052f1dc7SPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 22839f0c1e56SPeter Zijlstra extern int sched_group_set_rt_runtime(struct task_group *tg, 22849f0c1e56SPeter Zijlstra long rt_runtime_us); 22859f0c1e56SPeter Zijlstra extern long sched_group_rt_runtime(struct task_group *tg); 2286d0b27fa7SPeter Zijlstra extern int sched_group_set_rt_period(struct task_group *tg, 2287d0b27fa7SPeter Zijlstra long rt_period_us); 2288d0b27fa7SPeter Zijlstra extern long sched_group_rt_period(struct task_group *tg); 2289052f1dc7SPeter Zijlstra #endif 22909b5b7751SSrivatsa Vaddagiri #endif 22919b5b7751SSrivatsa Vaddagiri 22924b98d11bSAlexey Dobriyan #ifdef CONFIG_TASK_XACCT 22934b98d11bSAlexey Dobriyan static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 22944b98d11bSAlexey Dobriyan { 2295940389b8SAndrea Righi tsk->ioac.rchar += amt; 22964b98d11bSAlexey Dobriyan } 22974b98d11bSAlexey Dobriyan 22984b98d11bSAlexey Dobriyan static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 22994b98d11bSAlexey Dobriyan { 2300940389b8SAndrea Righi tsk->ioac.wchar += amt; 23014b98d11bSAlexey Dobriyan } 23024b98d11bSAlexey Dobriyan 23034b98d11bSAlexey Dobriyan static inline void inc_syscr(struct task_struct *tsk) 23044b98d11bSAlexey Dobriyan { 2305940389b8SAndrea Righi tsk->ioac.syscr++; 23064b98d11bSAlexey Dobriyan } 23074b98d11bSAlexey Dobriyan 23084b98d11bSAlexey Dobriyan static inline void inc_syscw(struct task_struct *tsk) 23094b98d11bSAlexey Dobriyan { 2310940389b8SAndrea Righi tsk->ioac.syscw++; 23114b98d11bSAlexey Dobriyan } 23124b98d11bSAlexey Dobriyan #else 23134b98d11bSAlexey Dobriyan static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 23144b98d11bSAlexey Dobriyan { 23154b98d11bSAlexey Dobriyan } 23164b98d11bSAlexey Dobriyan 23174b98d11bSAlexey Dobriyan static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 23184b98d11bSAlexey Dobriyan { 23194b98d11bSAlexey Dobriyan } 23204b98d11bSAlexey Dobriyan 23214b98d11bSAlexey Dobriyan static inline void inc_syscr(struct task_struct *tsk) 23224b98d11bSAlexey Dobriyan { 23234b98d11bSAlexey Dobriyan } 23244b98d11bSAlexey Dobriyan 23254b98d11bSAlexey Dobriyan static inline void inc_syscw(struct task_struct *tsk) 23264b98d11bSAlexey Dobriyan { 23274b98d11bSAlexey Dobriyan } 23284b98d11bSAlexey Dobriyan #endif 23294b98d11bSAlexey Dobriyan 233082455257SDave Hansen #ifndef TASK_SIZE_OF 233182455257SDave Hansen #define TASK_SIZE_OF(tsk) TASK_SIZE 233282455257SDave Hansen #endif 233382455257SDave Hansen 2334cf475ad2SBalbir Singh #ifdef CONFIG_MM_OWNER 2335cf475ad2SBalbir Singh extern void mm_update_next_owner(struct mm_struct *mm); 2336cf475ad2SBalbir Singh extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2337cf475ad2SBalbir Singh #else 2338cf475ad2SBalbir Singh static inline void mm_update_next_owner(struct mm_struct *mm) 2339cf475ad2SBalbir Singh { 2340cf475ad2SBalbir Singh } 2341cf475ad2SBalbir Singh 2342cf475ad2SBalbir Singh static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2343cf475ad2SBalbir Singh { 2344cf475ad2SBalbir Singh } 2345cf475ad2SBalbir Singh #endif /* CONFIG_MM_OWNER */ 2346cf475ad2SBalbir Singh 23477c731e0aSSteven Rostedt #define TASK_STATE_TO_CHAR_STR "RSDTtZX" 23487c731e0aSSteven Rostedt 23491da177e4SLinus Torvalds #endif /* __KERNEL__ */ 23501da177e4SLinus Torvalds 23511da177e4SLinus Torvalds #endif 2352