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 2531da177e4SLinus Torvalds extern cpumask_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 26348d5e258SPeter Zijlstra extern unsigned long rt_needs_cpu(int cpu); 26448d5e258SPeter Zijlstra 265e59e2ae2SIngo Molnar /* 26639bc89fdSIngo Molnar * Only dump TASK_* tasks. (0 for all tasks) 267e59e2ae2SIngo Molnar */ 268e59e2ae2SIngo Molnar extern void show_state_filter(unsigned long state_filter); 269e59e2ae2SIngo Molnar 270e59e2ae2SIngo Molnar static inline void show_state(void) 271e59e2ae2SIngo Molnar { 27239bc89fdSIngo Molnar show_state_filter(0); 273e59e2ae2SIngo Molnar } 274e59e2ae2SIngo Molnar 2751da177e4SLinus Torvalds extern void show_regs(struct pt_regs *); 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds /* 2781da177e4SLinus Torvalds * TASK is a pointer to the task whose backtrace we want to see (or NULL for current 2791da177e4SLinus Torvalds * task), SP is the stack pointer of the first frame that should be shown in the back 2801da177e4SLinus Torvalds * trace (or NULL if the entire call-chain of the task should be shown). 2811da177e4SLinus Torvalds */ 2821da177e4SLinus Torvalds extern void show_stack(struct task_struct *task, unsigned long *sp); 2831da177e4SLinus Torvalds 2841da177e4SLinus Torvalds void io_schedule(void); 2851da177e4SLinus Torvalds long io_schedule_timeout(long timeout); 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds extern void cpu_init (void); 2881da177e4SLinus Torvalds extern void trap_init(void); 289fa13a5a1SPaul Mackerras extern void account_process_tick(struct task_struct *task, int user); 2901da177e4SLinus Torvalds extern void update_process_times(int user); 2911da177e4SLinus Torvalds extern void scheduler_tick(void); 2921da177e4SLinus Torvalds 29382a1fcb9SIngo Molnar extern void sched_show_task(struct task_struct *p); 29482a1fcb9SIngo Molnar 2958446f1d3SIngo Molnar #ifdef CONFIG_DETECT_SOFTLOCKUP 2966687a97dSIngo Molnar extern void softlockup_tick(void); 2978446f1d3SIngo Molnar extern void touch_softlockup_watchdog(void); 29804c9167fSJeremy Fitzhardinge extern void touch_all_softlockup_watchdogs(void); 2999c44bc03SIngo Molnar extern unsigned int softlockup_panic; 30082a1fcb9SIngo Molnar extern unsigned long sysctl_hung_task_check_count; 30182a1fcb9SIngo Molnar extern unsigned long sysctl_hung_task_timeout_secs; 30290739081SIngo Molnar extern unsigned long sysctl_hung_task_warnings; 3039383d967SDimitri Sivanich extern int softlockup_thresh; 3048446f1d3SIngo Molnar #else 3056687a97dSIngo Molnar static inline void softlockup_tick(void) 3068446f1d3SIngo Molnar { 3078446f1d3SIngo Molnar } 3088446f1d3SIngo Molnar static inline void spawn_softlockup_task(void) 3098446f1d3SIngo Molnar { 3108446f1d3SIngo Molnar } 3118446f1d3SIngo Molnar static inline void touch_softlockup_watchdog(void) 3128446f1d3SIngo Molnar { 3138446f1d3SIngo Molnar } 31404c9167fSJeremy Fitzhardinge static inline void touch_all_softlockup_watchdogs(void) 31504c9167fSJeremy Fitzhardinge { 31604c9167fSJeremy Fitzhardinge } 3178446f1d3SIngo Molnar #endif 3188446f1d3SIngo Molnar 3198446f1d3SIngo Molnar 3201da177e4SLinus Torvalds /* Attach to any functions which should be ignored in wchan output. */ 3211da177e4SLinus Torvalds #define __sched __attribute__((__section__(".sched.text"))) 322deaf2227SIngo Molnar 323deaf2227SIngo Molnar /* Linker adds these: start and end of __sched functions */ 324deaf2227SIngo Molnar extern char __sched_text_start[], __sched_text_end[]; 325deaf2227SIngo Molnar 3261da177e4SLinus Torvalds /* Is this address in the __sched functions? */ 3271da177e4SLinus Torvalds extern int in_sched_functions(unsigned long addr); 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvalds #define MAX_SCHEDULE_TIMEOUT LONG_MAX 330b3c97528SHarvey Harrison extern signed long schedule_timeout(signed long timeout); 33164ed93a2SNishanth Aravamudan extern signed long schedule_timeout_interruptible(signed long timeout); 332294d5cc2SMatthew Wilcox extern signed long schedule_timeout_killable(signed long timeout); 33364ed93a2SNishanth Aravamudan extern signed long schedule_timeout_uninterruptible(signed long timeout); 3341da177e4SLinus Torvalds asmlinkage void schedule(void); 3351da177e4SLinus Torvalds 336ab516013SSerge E. Hallyn struct nsproxy; 337acce292cSCedric Le Goater struct user_namespace; 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds /* Maximum number of active map areas.. This is a random (large) number */ 3401da177e4SLinus Torvalds #define DEFAULT_MAX_MAP_COUNT 65536 3411da177e4SLinus Torvalds 3421da177e4SLinus Torvalds extern int sysctl_max_map_count; 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds #include <linux/aio.h> 3451da177e4SLinus Torvalds 3461da177e4SLinus Torvalds extern unsigned long 3471da177e4SLinus Torvalds arch_get_unmapped_area(struct file *, unsigned long, unsigned long, 3481da177e4SLinus Torvalds unsigned long, unsigned long); 3491da177e4SLinus Torvalds extern unsigned long 3501da177e4SLinus Torvalds arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, 3511da177e4SLinus Torvalds unsigned long len, unsigned long pgoff, 3521da177e4SLinus Torvalds unsigned long flags); 3531363c3cdSWolfgang Wander extern void arch_unmap_area(struct mm_struct *, unsigned long); 3541363c3cdSWolfgang Wander extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); 3551da177e4SLinus Torvalds 356f7d0b926SJeremy Fitzhardinge #if USE_SPLIT_PTLOCKS 357f412ac08SHugh Dickins /* 358f412ac08SHugh Dickins * The mm counters are not protected by its page_table_lock, 359f412ac08SHugh Dickins * so must be incremented atomically. 360f412ac08SHugh Dickins */ 361d3cb4871SChristoph Lameter #define set_mm_counter(mm, member, value) atomic_long_set(&(mm)->_##member, value) 362d3cb4871SChristoph Lameter #define get_mm_counter(mm, member) ((unsigned long)atomic_long_read(&(mm)->_##member)) 363d3cb4871SChristoph Lameter #define add_mm_counter(mm, member, value) atomic_long_add(value, &(mm)->_##member) 364d3cb4871SChristoph Lameter #define inc_mm_counter(mm, member) atomic_long_inc(&(mm)->_##member) 365d3cb4871SChristoph Lameter #define dec_mm_counter(mm, member) atomic_long_dec(&(mm)->_##member) 366f412ac08SHugh Dickins 367f7d0b926SJeremy Fitzhardinge #else /* !USE_SPLIT_PTLOCKS */ 368f412ac08SHugh Dickins /* 369f412ac08SHugh Dickins * The mm counters are protected by its page_table_lock, 370f412ac08SHugh Dickins * so can be incremented directly. 371f412ac08SHugh Dickins */ 3721da177e4SLinus Torvalds #define set_mm_counter(mm, member, value) (mm)->_##member = (value) 3731da177e4SLinus Torvalds #define get_mm_counter(mm, member) ((mm)->_##member) 3741da177e4SLinus Torvalds #define add_mm_counter(mm, member, value) (mm)->_##member += (value) 3751da177e4SLinus Torvalds #define inc_mm_counter(mm, member) (mm)->_##member++ 3761da177e4SLinus Torvalds #define dec_mm_counter(mm, member) (mm)->_##member-- 3774294621fSHugh Dickins 378f7d0b926SJeremy Fitzhardinge #endif /* !USE_SPLIT_PTLOCKS */ 379f412ac08SHugh Dickins 380f412ac08SHugh Dickins #define get_mm_rss(mm) \ 381f412ac08SHugh Dickins (get_mm_counter(mm, file_rss) + get_mm_counter(mm, anon_rss)) 382365e9c87SHugh Dickins #define update_hiwater_rss(mm) do { \ 383365e9c87SHugh Dickins unsigned long _rss = get_mm_rss(mm); \ 384365e9c87SHugh Dickins if ((mm)->hiwater_rss < _rss) \ 385365e9c87SHugh Dickins (mm)->hiwater_rss = _rss; \ 386365e9c87SHugh Dickins } while (0) 387365e9c87SHugh Dickins #define update_hiwater_vm(mm) do { \ 388365e9c87SHugh Dickins if ((mm)->hiwater_vm < (mm)->total_vm) \ 389365e9c87SHugh Dickins (mm)->hiwater_vm = (mm)->total_vm; \ 390365e9c87SHugh Dickins } while (0) 391365e9c87SHugh Dickins 3926c5d5238SKawai, Hidehiro extern void set_dumpable(struct mm_struct *mm, int value); 3936c5d5238SKawai, Hidehiro extern int get_dumpable(struct mm_struct *mm); 3946c5d5238SKawai, Hidehiro 3956c5d5238SKawai, Hidehiro /* mm flags */ 3963cb4a0bbSKawai, Hidehiro /* dumpable bits */ 3976c5d5238SKawai, Hidehiro #define MMF_DUMPABLE 0 /* core dump is permitted */ 3986c5d5238SKawai, Hidehiro #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ 3993cb4a0bbSKawai, Hidehiro #define MMF_DUMPABLE_BITS 2 4003cb4a0bbSKawai, Hidehiro 4013cb4a0bbSKawai, Hidehiro /* coredump filter bits */ 4023cb4a0bbSKawai, Hidehiro #define MMF_DUMP_ANON_PRIVATE 2 4033cb4a0bbSKawai, Hidehiro #define MMF_DUMP_ANON_SHARED 3 4043cb4a0bbSKawai, Hidehiro #define MMF_DUMP_MAPPED_PRIVATE 4 4053cb4a0bbSKawai, Hidehiro #define MMF_DUMP_MAPPED_SHARED 5 40682df3973SRoland McGrath #define MMF_DUMP_ELF_HEADERS 6 407e575f111SKOSAKI Motohiro #define MMF_DUMP_HUGETLB_PRIVATE 7 408e575f111SKOSAKI Motohiro #define MMF_DUMP_HUGETLB_SHARED 8 4093cb4a0bbSKawai, Hidehiro #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS 410e575f111SKOSAKI Motohiro #define MMF_DUMP_FILTER_BITS 7 4113cb4a0bbSKawai, Hidehiro #define MMF_DUMP_FILTER_MASK \ 4123cb4a0bbSKawai, Hidehiro (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) 4133cb4a0bbSKawai, Hidehiro #define MMF_DUMP_FILTER_DEFAULT \ 414e575f111SKOSAKI Motohiro ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ 415656eb2cdSRoland McGrath (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) 416656eb2cdSRoland McGrath 417656eb2cdSRoland McGrath #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS 418656eb2cdSRoland McGrath # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) 419656eb2cdSRoland McGrath #else 420656eb2cdSRoland McGrath # define MMF_DUMP_MASK_DEFAULT_ELF 0 421656eb2cdSRoland McGrath #endif 4226c5d5238SKawai, Hidehiro 4231da177e4SLinus Torvalds struct sighand_struct { 4241da177e4SLinus Torvalds atomic_t count; 4251da177e4SLinus Torvalds struct k_sigaction action[_NSIG]; 4261da177e4SLinus Torvalds spinlock_t siglock; 427b8fceee1SDavide Libenzi wait_queue_head_t signalfd_wqh; 4281da177e4SLinus Torvalds }; 4291da177e4SLinus Torvalds 4300e464814SKaiGai Kohei struct pacct_struct { 431f6ec29a4SKaiGai Kohei int ac_flag; 432f6ec29a4SKaiGai Kohei long ac_exitcode; 4330e464814SKaiGai Kohei unsigned long ac_mem; 43477787bfbSKaiGai Kohei cputime_t ac_utime, ac_stime; 43577787bfbSKaiGai Kohei unsigned long ac_minflt, ac_majflt; 4360e464814SKaiGai Kohei }; 4370e464814SKaiGai Kohei 438f06febc9SFrank Mayhar /** 439f06febc9SFrank Mayhar * struct task_cputime - collected CPU time counts 440f06febc9SFrank Mayhar * @utime: time spent in user mode, in &cputime_t units 441f06febc9SFrank Mayhar * @stime: time spent in kernel mode, in &cputime_t units 442f06febc9SFrank Mayhar * @sum_exec_runtime: total time spent on the CPU, in nanoseconds 443f06febc9SFrank Mayhar * 444f06febc9SFrank Mayhar * This structure groups together three kinds of CPU time that are 445f06febc9SFrank Mayhar * tracked for threads and thread groups. Most things considering 446f06febc9SFrank Mayhar * CPU time want to group these counts together and treat all three 447f06febc9SFrank Mayhar * of them in parallel. 448f06febc9SFrank Mayhar */ 449f06febc9SFrank Mayhar struct task_cputime { 450f06febc9SFrank Mayhar cputime_t utime; 451f06febc9SFrank Mayhar cputime_t stime; 452f06febc9SFrank Mayhar unsigned long long sum_exec_runtime; 453f06febc9SFrank Mayhar }; 454f06febc9SFrank Mayhar /* Alternate field names when used to cache expirations. */ 455f06febc9SFrank Mayhar #define prof_exp stime 456f06febc9SFrank Mayhar #define virt_exp utime 457f06febc9SFrank Mayhar #define sched_exp sum_exec_runtime 458f06febc9SFrank Mayhar 459f06febc9SFrank Mayhar /** 460f06febc9SFrank Mayhar * struct thread_group_cputime - thread group interval timer counts 461f06febc9SFrank Mayhar * @totals: thread group interval timers; substructure for 462f06febc9SFrank Mayhar * uniprocessor kernel, per-cpu for SMP kernel. 463f06febc9SFrank Mayhar * 464f06febc9SFrank Mayhar * This structure contains the version of task_cputime, above, that is 465f06febc9SFrank Mayhar * used for thread group CPU clock calculations. 466f06febc9SFrank Mayhar */ 467f06febc9SFrank Mayhar struct thread_group_cputime { 468f06febc9SFrank Mayhar struct task_cputime *totals; 469f06febc9SFrank Mayhar }; 470f06febc9SFrank Mayhar 4711da177e4SLinus Torvalds /* 4721da177e4SLinus Torvalds * NOTE! "signal_struct" does not have it's own 4731da177e4SLinus Torvalds * locking, because a shared signal_struct always 4741da177e4SLinus Torvalds * implies a shared sighand_struct, so locking 4751da177e4SLinus Torvalds * sighand_struct is always a proper superset of 4761da177e4SLinus Torvalds * the locking of signal_struct. 4771da177e4SLinus Torvalds */ 4781da177e4SLinus Torvalds struct signal_struct { 4791da177e4SLinus Torvalds atomic_t count; 4801da177e4SLinus Torvalds atomic_t live; 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds wait_queue_head_t wait_chldexit; /* for wait4() */ 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds /* current thread group signal load-balancing target: */ 48536c8b586SIngo Molnar struct task_struct *curr_target; 4861da177e4SLinus Torvalds 4871da177e4SLinus Torvalds /* shared signal handling: */ 4881da177e4SLinus Torvalds struct sigpending shared_pending; 4891da177e4SLinus Torvalds 4901da177e4SLinus Torvalds /* thread group exit support */ 4911da177e4SLinus Torvalds int group_exit_code; 4921da177e4SLinus Torvalds /* overloaded: 4931da177e4SLinus Torvalds * - notify group_exit_task when ->count is equal to notify_count 4941da177e4SLinus Torvalds * - everyone except group_exit_task is stopped during signal delivery 4951da177e4SLinus Torvalds * of fatal signals, group_exit_task processes the signal. 4961da177e4SLinus Torvalds */ 4971da177e4SLinus Torvalds int notify_count; 49807dd20e0SRichard Kennedy struct task_struct *group_exit_task; 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds /* thread group stop support, overloads group_exit_code too */ 5011da177e4SLinus Torvalds int group_stop_count; 5021da177e4SLinus Torvalds unsigned int flags; /* see SIGNAL_* flags below */ 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds /* POSIX.1b Interval Timers */ 5051da177e4SLinus Torvalds struct list_head posix_timers; 5061da177e4SLinus Torvalds 5071da177e4SLinus Torvalds /* ITIMER_REAL timer for the process */ 5082ff678b8SThomas Gleixner struct hrtimer real_timer; 509fea9d175SOleg Nesterov struct pid *leader_pid; 5102ff678b8SThomas Gleixner ktime_t it_real_incr; 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ 5131da177e4SLinus Torvalds cputime_t it_prof_expires, it_virt_expires; 5141da177e4SLinus Torvalds cputime_t it_prof_incr, it_virt_incr; 5151da177e4SLinus Torvalds 516f06febc9SFrank Mayhar /* 517f06febc9SFrank Mayhar * Thread group totals for process CPU clocks. 518f06febc9SFrank Mayhar * See thread_group_cputime(), et al, for details. 519f06febc9SFrank Mayhar */ 520f06febc9SFrank Mayhar struct thread_group_cputime cputime; 521f06febc9SFrank Mayhar 522f06febc9SFrank Mayhar /* Earliest-expiration cache. */ 523f06febc9SFrank Mayhar struct task_cputime cputime_expires; 524f06febc9SFrank Mayhar 525f06febc9SFrank Mayhar struct list_head cpu_timers[3]; 526f06febc9SFrank Mayhar 5271da177e4SLinus Torvalds /* job control IDs */ 5289a2e7057SPavel Emelyanov 5299a2e7057SPavel Emelyanov /* 5309a2e7057SPavel Emelyanov * pgrp and session fields are deprecated. 5319a2e7057SPavel Emelyanov * use the task_session_Xnr and task_pgrp_Xnr routines below 5329a2e7057SPavel Emelyanov */ 5339a2e7057SPavel Emelyanov 5349a2e7057SPavel Emelyanov union { 5359a2e7057SPavel Emelyanov pid_t pgrp __deprecated; 5369a2e7057SPavel Emelyanov pid_t __pgrp; 5379a2e7057SPavel Emelyanov }; 5389a2e7057SPavel Emelyanov 539ab521dc0SEric W. Biederman struct pid *tty_old_pgrp; 5401ec320afSCedric Le Goater 5411ec320afSCedric Le Goater union { 5421ec320afSCedric Le Goater pid_t session __deprecated; 5431ec320afSCedric Le Goater pid_t __session; 5441ec320afSCedric Le Goater }; 5451ec320afSCedric Le Goater 5461da177e4SLinus Torvalds /* boolean value for session group leader */ 5471da177e4SLinus Torvalds int leader; 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds struct tty_struct *tty; /* NULL if no tty */ 5501da177e4SLinus Torvalds 5511da177e4SLinus Torvalds /* 5521da177e4SLinus Torvalds * Cumulative resource counters for dead threads in the group, 5531da177e4SLinus Torvalds * and for reaped dead child processes forked by this group. 5541da177e4SLinus Torvalds * Live threads maintain their own counters and add to these 5551da177e4SLinus Torvalds * in __exit_signal, except for the group leader. 5561da177e4SLinus Torvalds */ 557f06febc9SFrank Mayhar cputime_t cutime, cstime; 5589ac52315SLaurent Vivier cputime_t gtime; 5599ac52315SLaurent Vivier cputime_t cgtime; 5601da177e4SLinus Torvalds unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 5611da177e4SLinus Torvalds unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 5626eaeeabaSEric Dumazet unsigned long inblock, oublock, cinblock, coublock; 563940389b8SAndrea Righi struct task_io_accounting ioac; 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds /* 5661da177e4SLinus Torvalds * We don't bother to synchronize most readers of this at all, 5671da177e4SLinus Torvalds * because there is no reader checking a limit that actually needs 5681da177e4SLinus Torvalds * to get both rlim_cur and rlim_max atomically, and either one 5691da177e4SLinus Torvalds * alone is a single word that can safely be read normally. 5701da177e4SLinus Torvalds * getrlimit/setrlimit use task_lock(current->group_leader) to 5711da177e4SLinus Torvalds * protect this instead of the siglock, because they really 5721da177e4SLinus Torvalds * have no need to disable irqs. 5731da177e4SLinus Torvalds */ 5741da177e4SLinus Torvalds struct rlimit rlim[RLIM_NLIMITS]; 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds /* keep the process-shared keyrings here so that they do the right 5771da177e4SLinus Torvalds * thing in threads created with CLONE_THREAD */ 5781da177e4SLinus Torvalds #ifdef CONFIG_KEYS 5791da177e4SLinus Torvalds struct key *session_keyring; /* keyring inherited over fork */ 5801da177e4SLinus Torvalds struct key *process_keyring; /* keyring private to this process */ 5811da177e4SLinus Torvalds #endif 5820e464814SKaiGai Kohei #ifdef CONFIG_BSD_PROCESS_ACCT 5830e464814SKaiGai Kohei struct pacct_struct pacct; /* per-process accounting information */ 5840e464814SKaiGai Kohei #endif 585ad4ecbcbSShailabh Nagar #ifdef CONFIG_TASKSTATS 586ad4ecbcbSShailabh Nagar struct taskstats *stats; 587ad4ecbcbSShailabh Nagar #endif 588522ed776SMiloslav Trmac #ifdef CONFIG_AUDIT 589522ed776SMiloslav Trmac unsigned audit_tty; 590522ed776SMiloslav Trmac struct tty_audit_buf *tty_audit_buf; 591522ed776SMiloslav Trmac #endif 5921da177e4SLinus Torvalds }; 5931da177e4SLinus Torvalds 5944866cde0SNick Piggin /* Context switch must be unlocked if interrupts are to be enabled */ 5954866cde0SNick Piggin #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW 5964866cde0SNick Piggin # define __ARCH_WANT_UNLOCKED_CTXSW 5974866cde0SNick Piggin #endif 5984866cde0SNick Piggin 5991da177e4SLinus Torvalds /* 6001da177e4SLinus Torvalds * Bits in flags field of signal_struct. 6011da177e4SLinus Torvalds */ 6021da177e4SLinus Torvalds #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ 6031da177e4SLinus Torvalds #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ 6041da177e4SLinus Torvalds #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ 6051da177e4SLinus Torvalds #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ 606e4420551SOleg Nesterov /* 607e4420551SOleg Nesterov * Pending notifications to parent. 608e4420551SOleg Nesterov */ 609e4420551SOleg Nesterov #define SIGNAL_CLD_STOPPED 0x00000010 610e4420551SOleg Nesterov #define SIGNAL_CLD_CONTINUED 0x00000020 611e4420551SOleg Nesterov #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) 6121da177e4SLinus Torvalds 613fae5fa44SOleg Nesterov #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ 614fae5fa44SOleg Nesterov 615ed5d2cacSOleg Nesterov /* If true, all threads except ->group_exit_task have pending SIGKILL */ 616ed5d2cacSOleg Nesterov static inline int signal_group_exit(const struct signal_struct *sig) 617ed5d2cacSOleg Nesterov { 618ed5d2cacSOleg Nesterov return (sig->flags & SIGNAL_GROUP_EXIT) || 619ed5d2cacSOleg Nesterov (sig->group_exit_task != NULL); 620ed5d2cacSOleg Nesterov } 621ed5d2cacSOleg Nesterov 6221da177e4SLinus Torvalds /* 6231da177e4SLinus Torvalds * Some day this will be a full-fledged user tracking system.. 6241da177e4SLinus Torvalds */ 6251da177e4SLinus Torvalds struct user_struct { 6261da177e4SLinus Torvalds atomic_t __count; /* reference count */ 6271da177e4SLinus Torvalds atomic_t processes; /* How many processes does this user have? */ 6281da177e4SLinus Torvalds atomic_t files; /* How many open files does this user have? */ 6291da177e4SLinus Torvalds atomic_t sigpending; /* How many pending signals does this user have? */ 6302d9048e2SAmy Griffis #ifdef CONFIG_INOTIFY_USER 6310eeca283SRobert Love atomic_t inotify_watches; /* How many inotify watches does this user have? */ 6320eeca283SRobert Love atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ 6330eeca283SRobert Love #endif 634970a8645SAlexey Dobriyan #ifdef CONFIG_POSIX_MQUEUE 6351da177e4SLinus Torvalds /* protected by mq_lock */ 6361da177e4SLinus Torvalds unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ 637970a8645SAlexey Dobriyan #endif 6381da177e4SLinus Torvalds unsigned long locked_shm; /* How many pages of mlocked shm ? */ 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvalds #ifdef CONFIG_KEYS 6411da177e4SLinus Torvalds struct key *uid_keyring; /* UID specific keyring */ 6421da177e4SLinus Torvalds struct key *session_keyring; /* UID's default session keyring */ 6431da177e4SLinus Torvalds #endif 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvalds /* Hash table maintenance information */ 646735de223SPavel Emelyanov struct hlist_node uidhash_node; 6471da177e4SLinus Torvalds uid_t uid; 64824e377a8SSrivatsa Vaddagiri 649052f1dc7SPeter Zijlstra #ifdef CONFIG_USER_SCHED 6504cf86d77SIngo Molnar struct task_group *tg; 651b1a8c172SDhaval Giani #ifdef CONFIG_SYSFS 652eb41d946SKay Sievers struct kobject kobj; 6535cb350baSDhaval Giani struct work_struct work; 65424e377a8SSrivatsa Vaddagiri #endif 655b1a8c172SDhaval Giani #endif 6561da177e4SLinus Torvalds }; 6571da177e4SLinus Torvalds 658eb41d946SKay Sievers extern int uids_sysfs_init(void); 6595cb350baSDhaval Giani 6601da177e4SLinus Torvalds extern struct user_struct *find_user(uid_t); 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds extern struct user_struct root_user; 6631da177e4SLinus Torvalds #define INIT_USER (&root_user) 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds struct backing_dev_info; 6661da177e4SLinus Torvalds struct reclaim_state; 6671da177e4SLinus Torvalds 66852f17b6cSChandra Seetharaman #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 6691da177e4SLinus Torvalds struct sched_info { 6701da177e4SLinus Torvalds /* cumulative counters */ 6712d72376bSIngo Molnar unsigned long pcount; /* # of times run on this cpu */ 672172ba844SBalbir Singh unsigned long long cpu_time, /* time spent on the cpu */ 673172ba844SBalbir Singh run_delay; /* time spent waiting on a runqueue */ 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /* timestamps */ 676172ba844SBalbir Singh unsigned long long last_arrival,/* when we last ran on a cpu */ 6771da177e4SLinus Torvalds last_queued; /* when we were last queued to run */ 678b8efb561SIngo Molnar #ifdef CONFIG_SCHEDSTATS 679b8efb561SIngo Molnar /* BKL stats */ 680480b9434SKen Chen unsigned int bkl_count; 681b8efb561SIngo Molnar #endif 6821da177e4SLinus Torvalds }; 68352f17b6cSChandra Seetharaman #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ 6841da177e4SLinus Torvalds 685ca74e92bSShailabh Nagar #ifdef CONFIG_TASK_DELAY_ACCT 686ca74e92bSShailabh Nagar struct task_delay_info { 687ca74e92bSShailabh Nagar spinlock_t lock; 688ca74e92bSShailabh Nagar unsigned int flags; /* Private per-task flags */ 689ca74e92bSShailabh Nagar 690ca74e92bSShailabh Nagar /* For each stat XXX, add following, aligned appropriately 691ca74e92bSShailabh Nagar * 692ca74e92bSShailabh Nagar * struct timespec XXX_start, XXX_end; 693ca74e92bSShailabh Nagar * u64 XXX_delay; 694ca74e92bSShailabh Nagar * u32 XXX_count; 695ca74e92bSShailabh Nagar * 696ca74e92bSShailabh Nagar * Atomicity of updates to XXX_delay, XXX_count protected by 697ca74e92bSShailabh Nagar * single lock above (split into XXX_lock if contention is an issue). 698ca74e92bSShailabh Nagar */ 6990ff92245SShailabh Nagar 7000ff92245SShailabh Nagar /* 7010ff92245SShailabh Nagar * XXX_count is incremented on every XXX operation, the delay 7020ff92245SShailabh Nagar * associated with the operation is added to XXX_delay. 7030ff92245SShailabh Nagar * XXX_delay contains the accumulated delay time in nanoseconds. 7040ff92245SShailabh Nagar */ 7050ff92245SShailabh Nagar struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ 7060ff92245SShailabh Nagar u64 blkio_delay; /* wait for sync block io completion */ 7070ff92245SShailabh Nagar u64 swapin_delay; /* wait for swapin block io completion */ 7080ff92245SShailabh Nagar u32 blkio_count; /* total count of the number of sync block */ 7090ff92245SShailabh Nagar /* io operations performed */ 7100ff92245SShailabh Nagar u32 swapin_count; /* total count of the number of swapin block */ 7110ff92245SShailabh Nagar /* io operations performed */ 712873b4771SKeika Kobayashi 713873b4771SKeika Kobayashi struct timespec freepages_start, freepages_end; 714873b4771SKeika Kobayashi u64 freepages_delay; /* wait for memory reclaim */ 715873b4771SKeika Kobayashi u32 freepages_count; /* total count of memory reclaim */ 716ca74e92bSShailabh Nagar }; 71752f17b6cSChandra Seetharaman #endif /* CONFIG_TASK_DELAY_ACCT */ 71852f17b6cSChandra Seetharaman 71952f17b6cSChandra Seetharaman static inline int sched_info_on(void) 72052f17b6cSChandra Seetharaman { 72152f17b6cSChandra Seetharaman #ifdef CONFIG_SCHEDSTATS 72252f17b6cSChandra Seetharaman return 1; 72352f17b6cSChandra Seetharaman #elif defined(CONFIG_TASK_DELAY_ACCT) 72452f17b6cSChandra Seetharaman extern int delayacct_on; 72552f17b6cSChandra Seetharaman return delayacct_on; 72652f17b6cSChandra Seetharaman #else 72752f17b6cSChandra Seetharaman return 0; 728ca74e92bSShailabh Nagar #endif 72952f17b6cSChandra Seetharaman } 730ca74e92bSShailabh Nagar 731d15bcfdbSIngo Molnar enum cpu_idle_type { 732d15bcfdbSIngo Molnar CPU_IDLE, 733d15bcfdbSIngo Molnar CPU_NOT_IDLE, 734d15bcfdbSIngo Molnar CPU_NEWLY_IDLE, 735d15bcfdbSIngo Molnar CPU_MAX_IDLE_TYPES 7361da177e4SLinus Torvalds }; 7371da177e4SLinus Torvalds 7381da177e4SLinus Torvalds /* 7391da177e4SLinus Torvalds * sched-domains (multiprocessor balancing) declarations: 7401da177e4SLinus Torvalds */ 7419aa7b369SIngo Molnar 7429aa7b369SIngo Molnar /* 7439aa7b369SIngo Molnar * Increase resolution of nice-level calculations: 7449aa7b369SIngo Molnar */ 7459aa7b369SIngo Molnar #define SCHED_LOAD_SHIFT 10 7469aa7b369SIngo Molnar #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) 7479aa7b369SIngo Molnar 748f8700df7SSuresh Siddha #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE 7491da177e4SLinus Torvalds 7502dd73a4fSPeter Williams #ifdef CONFIG_SMP 7511da177e4SLinus Torvalds #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ 7521da177e4SLinus Torvalds #define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ 7531da177e4SLinus Torvalds #define SD_BALANCE_EXEC 4 /* Balance on exec */ 754147cbb4bSNick Piggin #define SD_BALANCE_FORK 8 /* Balance on fork, clone */ 755147cbb4bSNick Piggin #define SD_WAKE_IDLE 16 /* Wake to idle CPU on task wakeup */ 756147cbb4bSNick Piggin #define SD_WAKE_AFFINE 32 /* Wake task to waking CPU */ 757147cbb4bSNick Piggin #define SD_WAKE_BALANCE 64 /* Perform balancing at task wakeup */ 758147cbb4bSNick Piggin #define SD_SHARE_CPUPOWER 128 /* Domain members share cpu power */ 7595c45bf27SSiddha, Suresh B #define SD_POWERSAVINGS_BALANCE 256 /* Balance for power savings */ 76089c4710eSSiddha, Suresh B #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ 76108c183f3SChristoph Lameter #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ 7621d3504fcSHidetoshi Seto #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */ 7635c45bf27SSiddha, Suresh B 76489c4710eSSiddha, Suresh B #define BALANCE_FOR_MC_POWER \ 76589c4710eSSiddha, Suresh B (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) 76689c4710eSSiddha, Suresh B 76789c4710eSSiddha, Suresh B #define BALANCE_FOR_PKG_POWER \ 76889c4710eSSiddha, Suresh B ((sched_mc_power_savings || sched_smt_power_savings) ? \ 76989c4710eSSiddha, Suresh B SD_POWERSAVINGS_BALANCE : 0) 77089c4710eSSiddha, Suresh B 77189c4710eSSiddha, Suresh B #define test_sd_parent(sd, flag) ((sd->parent && \ 77289c4710eSSiddha, Suresh B (sd->parent->flags & flag)) ? 1 : 0) 7735c45bf27SSiddha, Suresh B 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds struct sched_group { 7761da177e4SLinus Torvalds struct sched_group *next; /* Must be a circular list */ 7771da177e4SLinus Torvalds cpumask_t cpumask; 7781da177e4SLinus Torvalds 7791da177e4SLinus Torvalds /* 7801da177e4SLinus Torvalds * CPU power of this group, SCHED_LOAD_SCALE being max power for a 7811da177e4SLinus Torvalds * single CPU. This is read only (except for setup, hotplug CPU). 7825517d86bSEric Dumazet * Note : Never change cpu_power without recompute its reciprocal 7831da177e4SLinus Torvalds */ 7845517d86bSEric Dumazet unsigned int __cpu_power; 7855517d86bSEric Dumazet /* 7865517d86bSEric Dumazet * reciprocal value of cpu_power to avoid expensive divides 7875517d86bSEric Dumazet * (see include/linux/reciprocal_div.h) 7885517d86bSEric Dumazet */ 7895517d86bSEric Dumazet u32 reciprocal_cpu_power; 7901da177e4SLinus Torvalds }; 7911da177e4SLinus Torvalds 7921d3504fcSHidetoshi Seto enum sched_domain_level { 7931d3504fcSHidetoshi Seto SD_LV_NONE = 0, 7941d3504fcSHidetoshi Seto SD_LV_SIBLING, 7951d3504fcSHidetoshi Seto SD_LV_MC, 7961d3504fcSHidetoshi Seto SD_LV_CPU, 7971d3504fcSHidetoshi Seto SD_LV_NODE, 7981d3504fcSHidetoshi Seto SD_LV_ALLNODES, 7991d3504fcSHidetoshi Seto SD_LV_MAX 8001d3504fcSHidetoshi Seto }; 8011d3504fcSHidetoshi Seto 8021d3504fcSHidetoshi Seto struct sched_domain_attr { 8031d3504fcSHidetoshi Seto int relax_domain_level; 8041d3504fcSHidetoshi Seto }; 8051d3504fcSHidetoshi Seto 8061d3504fcSHidetoshi Seto #define SD_ATTR_INIT (struct sched_domain_attr) { \ 8071d3504fcSHidetoshi Seto .relax_domain_level = -1, \ 8081d3504fcSHidetoshi Seto } 8091d3504fcSHidetoshi Seto 8101da177e4SLinus Torvalds struct sched_domain { 8111da177e4SLinus Torvalds /* These fields must be setup */ 8121da177e4SLinus Torvalds struct sched_domain *parent; /* top domain must be null terminated */ 8131a848870SSiddha, Suresh B struct sched_domain *child; /* bottom domain must be null terminated */ 8141da177e4SLinus Torvalds struct sched_group *groups; /* the balancing groups of the domain */ 8151da177e4SLinus Torvalds cpumask_t span; /* span of all CPUs in this domain */ 8161da177e4SLinus Torvalds unsigned long min_interval; /* Minimum balance interval ms */ 8171da177e4SLinus Torvalds unsigned long max_interval; /* Maximum balance interval ms */ 8181da177e4SLinus Torvalds unsigned int busy_factor; /* less balancing by factor if busy */ 8191da177e4SLinus Torvalds unsigned int imbalance_pct; /* No balance until over watermark */ 8201da177e4SLinus Torvalds unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ 8217897986bSNick Piggin unsigned int busy_idx; 8227897986bSNick Piggin unsigned int idle_idx; 8237897986bSNick Piggin unsigned int newidle_idx; 8247897986bSNick Piggin unsigned int wake_idx; 825147cbb4bSNick Piggin unsigned int forkexec_idx; 8261da177e4SLinus Torvalds int flags; /* See SD_* */ 8271d3504fcSHidetoshi Seto enum sched_domain_level level; 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvalds /* Runtime fields. */ 8301da177e4SLinus Torvalds unsigned long last_balance; /* init to jiffies. units in jiffies */ 8311da177e4SLinus Torvalds unsigned int balance_interval; /* initialise to 1. units in ms. */ 8321da177e4SLinus Torvalds unsigned int nr_balance_failed; /* initialise to 0 */ 8331da177e4SLinus Torvalds 8342398f2c6SPeter Zijlstra u64 last_update; 8352398f2c6SPeter Zijlstra 8361da177e4SLinus Torvalds #ifdef CONFIG_SCHEDSTATS 8371da177e4SLinus Torvalds /* load_balance() stats */ 838480b9434SKen Chen unsigned int lb_count[CPU_MAX_IDLE_TYPES]; 839480b9434SKen Chen unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; 840480b9434SKen Chen unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; 841480b9434SKen Chen unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; 842480b9434SKen Chen unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; 843480b9434SKen Chen unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; 844480b9434SKen Chen unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; 845480b9434SKen Chen unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvalds /* Active load balancing */ 848480b9434SKen Chen unsigned int alb_count; 849480b9434SKen Chen unsigned int alb_failed; 850480b9434SKen Chen unsigned int alb_pushed; 8511da177e4SLinus Torvalds 85268767a0aSNick Piggin /* SD_BALANCE_EXEC stats */ 853480b9434SKen Chen unsigned int sbe_count; 854480b9434SKen Chen unsigned int sbe_balanced; 855480b9434SKen Chen unsigned int sbe_pushed; 8561da177e4SLinus Torvalds 85768767a0aSNick Piggin /* SD_BALANCE_FORK stats */ 858480b9434SKen Chen unsigned int sbf_count; 859480b9434SKen Chen unsigned int sbf_balanced; 860480b9434SKen Chen unsigned int sbf_pushed; 86168767a0aSNick Piggin 8621da177e4SLinus Torvalds /* try_to_wake_up() stats */ 863480b9434SKen Chen unsigned int ttwu_wake_remote; 864480b9434SKen Chen unsigned int ttwu_move_affine; 865480b9434SKen Chen unsigned int ttwu_move_balance; 8661da177e4SLinus Torvalds #endif 867a5d8c348SIngo Molnar #ifdef CONFIG_SCHED_DEBUG 868a5d8c348SIngo Molnar char *name; 869a5d8c348SIngo Molnar #endif 8701da177e4SLinus Torvalds }; 8711da177e4SLinus Torvalds 8721d3504fcSHidetoshi Seto extern void partition_sched_domains(int ndoms_new, cpumask_t *doms_new, 8731d3504fcSHidetoshi Seto struct sched_domain_attr *dattr_new); 8749aefd0abSHeiko Carstens extern int arch_reinit_sched_domains(void); 875029190c5SPaul Jackson 8761b427c15SIngo Molnar #else /* CONFIG_SMP */ 8771b427c15SIngo Molnar 8781b427c15SIngo Molnar struct sched_domain_attr; 8791b427c15SIngo Molnar 8801b427c15SIngo Molnar static inline void 8811b427c15SIngo Molnar partition_sched_domains(int ndoms_new, cpumask_t *doms_new, 8821b427c15SIngo Molnar struct sched_domain_attr *dattr_new) 8831b427c15SIngo Molnar { 8841b427c15SIngo Molnar } 8851b427c15SIngo Molnar #endif /* !CONFIG_SMP */ 8861da177e4SLinus Torvalds 8871da177e4SLinus Torvalds struct io_context; /* See blkdev.h */ 8881da177e4SLinus Torvalds #define NGROUPS_SMALL 32 8891bf47346SEric Dumazet #define NGROUPS_PER_BLOCK ((unsigned int)(PAGE_SIZE / sizeof(gid_t))) 8901da177e4SLinus Torvalds struct group_info { 8911da177e4SLinus Torvalds int ngroups; 8921da177e4SLinus Torvalds atomic_t usage; 8931da177e4SLinus Torvalds gid_t small_block[NGROUPS_SMALL]; 8941da177e4SLinus Torvalds int nblocks; 8951da177e4SLinus Torvalds gid_t *blocks[0]; 8961da177e4SLinus Torvalds }; 8971da177e4SLinus Torvalds 8981da177e4SLinus Torvalds /* 8991da177e4SLinus Torvalds * get_group_info() must be called with the owning task locked (via task_lock()) 9001da177e4SLinus Torvalds * when task != current. The reason being that the vast majority of callers are 9011da177e4SLinus Torvalds * looking at current->group_info, which can not be changed except by the 9021da177e4SLinus Torvalds * current task. Changing current->group_info requires the task lock, too. 9031da177e4SLinus Torvalds */ 9041da177e4SLinus Torvalds #define get_group_info(group_info) do { \ 9051da177e4SLinus Torvalds atomic_inc(&(group_info)->usage); \ 9061da177e4SLinus Torvalds } while (0) 9071da177e4SLinus Torvalds 9081da177e4SLinus Torvalds #define put_group_info(group_info) do { \ 9091da177e4SLinus Torvalds if (atomic_dec_and_test(&(group_info)->usage)) \ 9101da177e4SLinus Torvalds groups_free(group_info); \ 9111da177e4SLinus Torvalds } while (0) 9121da177e4SLinus Torvalds 9133e30148cSDavid Howells extern struct group_info *groups_alloc(int gidsetsize); 9143e30148cSDavid Howells extern void groups_free(struct group_info *group_info); 9153e30148cSDavid Howells extern int set_current_groups(struct group_info *group_info); 9163e30148cSDavid Howells extern int groups_search(struct group_info *group_info, gid_t grp); 9171da177e4SLinus Torvalds /* access the groups "array" with this macro */ 9181da177e4SLinus Torvalds #define GROUP_AT(gi, i) \ 9191da177e4SLinus Torvalds ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) 9201da177e4SLinus Torvalds 921383f2835SChen, Kenneth W #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK 92236c8b586SIngo Molnar extern void prefetch_stack(struct task_struct *t); 923383f2835SChen, Kenneth W #else 924383f2835SChen, Kenneth W static inline void prefetch_stack(struct task_struct *t) { } 925383f2835SChen, Kenneth W #endif 9261da177e4SLinus Torvalds 9271da177e4SLinus Torvalds struct audit_context; /* See audit.c */ 9281da177e4SLinus Torvalds struct mempolicy; 929b92ce558SJens Axboe struct pipe_inode_info; 9304865ecf1SSerge E. Hallyn struct uts_namespace; 9311da177e4SLinus Torvalds 93220b8a59fSIngo Molnar struct rq; 93320b8a59fSIngo Molnar struct sched_domain; 93420b8a59fSIngo Molnar 93520b8a59fSIngo Molnar struct sched_class { 9365522d5d5SIngo Molnar const struct sched_class *next; 93720b8a59fSIngo Molnar 938fd390f6aSIngo Molnar void (*enqueue_task) (struct rq *rq, struct task_struct *p, int wakeup); 939f02231e5SIngo Molnar void (*dequeue_task) (struct rq *rq, struct task_struct *p, int sleep); 9404530d7abSDmitry Adamushko void (*yield_task) (struct rq *rq); 94120b8a59fSIngo Molnar 94215afe09bSPeter Zijlstra void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int sync); 94320b8a59fSIngo Molnar 944fb8d4724SIngo Molnar struct task_struct * (*pick_next_task) (struct rq *rq); 94531ee529cSIngo Molnar void (*put_prev_task) (struct rq *rq, struct task_struct *p); 94620b8a59fSIngo Molnar 947681f3e68SPeter Williams #ifdef CONFIG_SMP 9484ce72a2cSLi Zefan int (*select_task_rq)(struct task_struct *p, int sync); 9494ce72a2cSLi Zefan 95043010659SPeter Williams unsigned long (*load_balance) (struct rq *this_rq, int this_cpu, 951e1d1484fSPeter Williams struct rq *busiest, unsigned long max_load_move, 95220b8a59fSIngo Molnar struct sched_domain *sd, enum cpu_idle_type idle, 953a4ac01c3SPeter Williams int *all_pinned, int *this_best_prio); 95420b8a59fSIngo Molnar 955e1d1484fSPeter Williams int (*move_one_task) (struct rq *this_rq, int this_cpu, 956e1d1484fSPeter Williams struct rq *busiest, struct sched_domain *sd, 957e1d1484fSPeter Williams enum cpu_idle_type idle); 9589a897c5aSSteven Rostedt void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); 9599a897c5aSSteven Rostedt void (*post_schedule) (struct rq *this_rq); 9609a897c5aSSteven Rostedt void (*task_wake_up) (struct rq *this_rq, struct task_struct *task); 961e1d1484fSPeter Williams 962cd8ba7cdSMike Travis void (*set_cpus_allowed)(struct task_struct *p, 963cd8ba7cdSMike Travis const cpumask_t *newmask); 96457d885feSGregory Haskins 9651f11eb6aSGregory Haskins void (*rq_online)(struct rq *rq); 9661f11eb6aSGregory Haskins void (*rq_offline)(struct rq *rq); 9674ce72a2cSLi Zefan #endif 9684ce72a2cSLi Zefan 9694ce72a2cSLi Zefan void (*set_curr_task) (struct rq *rq); 9704ce72a2cSLi Zefan void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); 9714ce72a2cSLi Zefan void (*task_new) (struct rq *rq, struct task_struct *p); 972cb469845SSteven Rostedt 973cb469845SSteven Rostedt void (*switched_from) (struct rq *this_rq, struct task_struct *task, 974cb469845SSteven Rostedt int running); 975cb469845SSteven Rostedt void (*switched_to) (struct rq *this_rq, struct task_struct *task, 976cb469845SSteven Rostedt int running); 977cb469845SSteven Rostedt void (*prio_changed) (struct rq *this_rq, struct task_struct *task, 978cb469845SSteven Rostedt int oldprio, int running); 979810b3817SPeter Zijlstra 980810b3817SPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 981810b3817SPeter Zijlstra void (*moved_group) (struct task_struct *p); 982810b3817SPeter Zijlstra #endif 98320b8a59fSIngo Molnar }; 98420b8a59fSIngo Molnar 98520b8a59fSIngo Molnar struct load_weight { 98620b8a59fSIngo Molnar unsigned long weight, inv_weight; 98720b8a59fSIngo Molnar }; 98820b8a59fSIngo Molnar 98920b8a59fSIngo Molnar /* 99020b8a59fSIngo Molnar * CFS stats for a schedulable entity (task, task-group etc) 99120b8a59fSIngo Molnar * 99220b8a59fSIngo Molnar * Current field usage histogram: 99320b8a59fSIngo Molnar * 99420b8a59fSIngo Molnar * 4 se->block_start 99520b8a59fSIngo Molnar * 4 se->run_node 99620b8a59fSIngo Molnar * 4 se->sleep_start 99720b8a59fSIngo Molnar * 6 se->load.weight 99820b8a59fSIngo Molnar */ 99920b8a59fSIngo Molnar struct sched_entity { 100020b8a59fSIngo Molnar struct load_weight load; /* for load-balancing */ 100120b8a59fSIngo Molnar struct rb_node run_node; 10024a55bd5eSPeter Zijlstra struct list_head group_node; 100320b8a59fSIngo Molnar unsigned int on_rq; 100420b8a59fSIngo Molnar 100520b8a59fSIngo Molnar u64 exec_start; 100694c18227SIngo Molnar u64 sum_exec_runtime; 1007e9acbff6SIngo Molnar u64 vruntime; 1008f6cf891cSIngo Molnar u64 prev_sum_exec_runtime; 100994c18227SIngo Molnar 10104ae7d5ceSIngo Molnar u64 last_wakeup; 10114ae7d5ceSIngo Molnar u64 avg_overlap; 10124ae7d5ceSIngo Molnar 101394c18227SIngo Molnar #ifdef CONFIG_SCHEDSTATS 101494c18227SIngo Molnar u64 wait_start; 101594c18227SIngo Molnar u64 wait_max; 10166d082592SArjan van de Ven u64 wait_count; 10176d082592SArjan van de Ven u64 wait_sum; 101894c18227SIngo Molnar 101994c18227SIngo Molnar u64 sleep_start; 102020b8a59fSIngo Molnar u64 sleep_max; 102194c18227SIngo Molnar s64 sum_sleep_runtime; 102294c18227SIngo Molnar 102394c18227SIngo Molnar u64 block_start; 102420b8a59fSIngo Molnar u64 block_max; 102520b8a59fSIngo Molnar u64 exec_max; 1026eba1ed4bSIngo Molnar u64 slice_max; 1027cc367732SIngo Molnar 1028cc367732SIngo Molnar u64 nr_migrations; 1029cc367732SIngo Molnar u64 nr_migrations_cold; 1030cc367732SIngo Molnar u64 nr_failed_migrations_affine; 1031cc367732SIngo Molnar u64 nr_failed_migrations_running; 1032cc367732SIngo Molnar u64 nr_failed_migrations_hot; 1033cc367732SIngo Molnar u64 nr_forced_migrations; 1034cc367732SIngo Molnar u64 nr_forced2_migrations; 1035cc367732SIngo Molnar 1036cc367732SIngo Molnar u64 nr_wakeups; 1037cc367732SIngo Molnar u64 nr_wakeups_sync; 1038cc367732SIngo Molnar u64 nr_wakeups_migrate; 1039cc367732SIngo Molnar u64 nr_wakeups_local; 1040cc367732SIngo Molnar u64 nr_wakeups_remote; 1041cc367732SIngo Molnar u64 nr_wakeups_affine; 1042cc367732SIngo Molnar u64 nr_wakeups_affine_attempts; 1043cc367732SIngo Molnar u64 nr_wakeups_passive; 1044cc367732SIngo Molnar u64 nr_wakeups_idle; 104594c18227SIngo Molnar #endif 104694c18227SIngo Molnar 104720b8a59fSIngo Molnar #ifdef CONFIG_FAIR_GROUP_SCHED 104820b8a59fSIngo Molnar struct sched_entity *parent; 104920b8a59fSIngo Molnar /* rq on which this entity is (to be) queued: */ 105020b8a59fSIngo Molnar struct cfs_rq *cfs_rq; 105120b8a59fSIngo Molnar /* rq "owned" by this entity/group: */ 105220b8a59fSIngo Molnar struct cfs_rq *my_q; 105320b8a59fSIngo Molnar #endif 105420b8a59fSIngo Molnar }; 105570b97a7fSIngo Molnar 1056fa717060SPeter Zijlstra struct sched_rt_entity { 1057fa717060SPeter Zijlstra struct list_head run_list; 105878f2c7dbSPeter Zijlstra unsigned long timeout; 1059bee367edSRichard Kennedy unsigned int time_slice; 10606f505b16SPeter Zijlstra int nr_cpus_allowed; 10616f505b16SPeter Zijlstra 106258d6c2d7SPeter Zijlstra struct sched_rt_entity *back; 1063052f1dc7SPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 10646f505b16SPeter Zijlstra struct sched_rt_entity *parent; 10656f505b16SPeter Zijlstra /* rq on which this entity is (to be) queued: */ 10666f505b16SPeter Zijlstra struct rt_rq *rt_rq; 10676f505b16SPeter Zijlstra /* rq "owned" by this entity/group: */ 10686f505b16SPeter Zijlstra struct rt_rq *my_q; 10696f505b16SPeter Zijlstra #endif 1070fa717060SPeter Zijlstra }; 1071fa717060SPeter Zijlstra 10721da177e4SLinus Torvalds struct task_struct { 10731da177e4SLinus Torvalds volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ 1074f7e4217bSRoman Zippel void *stack; 10751da177e4SLinus Torvalds atomic_t usage; 107697dc32cdSWilliam Cohen unsigned int flags; /* per process flags, defined below */ 107797dc32cdSWilliam Cohen unsigned int ptrace; 10781da177e4SLinus Torvalds 107936772092SPaolo 'Blaisorblade' Giarrusso int lock_depth; /* BKL lock depth */ 10801da177e4SLinus Torvalds 10812dd73a4fSPeter Williams #ifdef CONFIG_SMP 10822dd73a4fSPeter Williams #ifdef __ARCH_WANT_UNLOCKED_CTXSW 10834866cde0SNick Piggin int oncpu; 10844866cde0SNick Piggin #endif 10852dd73a4fSPeter Williams #endif 108650e645a8SIngo Molnar 1087b29739f9SIngo Molnar int prio, static_prio, normal_prio; 1088c7aceabaSRichard Kennedy unsigned int rt_priority; 10895522d5d5SIngo Molnar const struct sched_class *sched_class; 109020b8a59fSIngo Molnar struct sched_entity se; 1091fa717060SPeter Zijlstra struct sched_rt_entity rt; 10921da177e4SLinus Torvalds 1093e107be36SAvi Kivity #ifdef CONFIG_PREEMPT_NOTIFIERS 1094e107be36SAvi Kivity /* list of struct preempt_notifier: */ 1095e107be36SAvi Kivity struct hlist_head preempt_notifiers; 1096e107be36SAvi Kivity #endif 1097e107be36SAvi Kivity 109818796aa0SAlexey Dobriyan /* 109918796aa0SAlexey Dobriyan * fpu_counter contains the number of consecutive context switches 110018796aa0SAlexey Dobriyan * that the FPU is used. If this is over a threshold, the lazy fpu 110118796aa0SAlexey Dobriyan * saving becomes unlazy to save the trap. This is an unsigned char 110218796aa0SAlexey Dobriyan * so that after 256 times the counter wraps and the behavior turns 110318796aa0SAlexey Dobriyan * lazy again; this to deal with bursty apps that only use FPU for 110418796aa0SAlexey Dobriyan * a short time 110518796aa0SAlexey Dobriyan */ 110618796aa0SAlexey Dobriyan unsigned char fpu_counter; 110718796aa0SAlexey Dobriyan s8 oomkilladj; /* OOM kill score adjustment (bit shift). */ 11086c5c9341SAlexey Dobriyan #ifdef CONFIG_BLK_DEV_IO_TRACE 11092056a782SJens Axboe unsigned int btrace_seq; 11106c5c9341SAlexey Dobriyan #endif 11111da177e4SLinus Torvalds 111297dc32cdSWilliam Cohen unsigned int policy; 11131da177e4SLinus Torvalds cpumask_t cpus_allowed; 11141da177e4SLinus Torvalds 1115e260be67SPaul E. McKenney #ifdef CONFIG_PREEMPT_RCU 1116e260be67SPaul E. McKenney int rcu_read_lock_nesting; 1117e260be67SPaul E. McKenney int rcu_flipctr_idx; 1118e260be67SPaul E. McKenney #endif /* #ifdef CONFIG_PREEMPT_RCU */ 1119e260be67SPaul E. McKenney 112052f17b6cSChandra Seetharaman #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) 11211da177e4SLinus Torvalds struct sched_info sched_info; 11221da177e4SLinus Torvalds #endif 11231da177e4SLinus Torvalds 11241da177e4SLinus Torvalds struct list_head tasks; 11251da177e4SLinus Torvalds 11261da177e4SLinus Torvalds struct mm_struct *mm, *active_mm; 11271da177e4SLinus Torvalds 11281da177e4SLinus Torvalds /* task state */ 11291da177e4SLinus Torvalds struct linux_binfmt *binfmt; 113097dc32cdSWilliam Cohen int exit_state; 11311da177e4SLinus Torvalds int exit_code, exit_signal; 11321da177e4SLinus Torvalds int pdeath_signal; /* The signal sent when the parent dies */ 11331da177e4SLinus Torvalds /* ??? */ 113497dc32cdSWilliam Cohen unsigned int personality; 11351da177e4SLinus Torvalds unsigned did_exec:1; 11361da177e4SLinus Torvalds pid_t pid; 11371da177e4SLinus Torvalds pid_t tgid; 11380a425405SArjan van de Ven 11390a425405SArjan van de Ven #ifdef CONFIG_CC_STACKPROTECTOR 11400a425405SArjan van de Ven /* Canary value for the -fstack-protector gcc feature */ 11410a425405SArjan van de Ven unsigned long stack_canary; 11420a425405SArjan van de Ven #endif 11431da177e4SLinus Torvalds /* 11441da177e4SLinus Torvalds * pointers to (original) parent process, youngest child, younger sibling, 11451da177e4SLinus Torvalds * older sibling, respectively. (p->father can be replaced with 1146f470021aSRoland McGrath * p->real_parent->pid) 11471da177e4SLinus Torvalds */ 1148f470021aSRoland McGrath struct task_struct *real_parent; /* real parent process */ 1149f470021aSRoland McGrath struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ 11501da177e4SLinus Torvalds /* 1151f470021aSRoland McGrath * children/sibling forms the list of my natural children 11521da177e4SLinus Torvalds */ 11531da177e4SLinus Torvalds struct list_head children; /* list of my children */ 11541da177e4SLinus Torvalds struct list_head sibling; /* linkage in my parent's children list */ 11551da177e4SLinus Torvalds struct task_struct *group_leader; /* threadgroup leader */ 11561da177e4SLinus Torvalds 1157f470021aSRoland McGrath /* 1158f470021aSRoland McGrath * ptraced is the list of tasks this task is using ptrace on. 1159f470021aSRoland McGrath * This includes both natural children and PTRACE_ATTACH targets. 1160f470021aSRoland McGrath * p->ptrace_entry is p's link on the p->parent->ptraced list. 1161f470021aSRoland McGrath */ 1162f470021aSRoland McGrath struct list_head ptraced; 1163f470021aSRoland McGrath struct list_head ptrace_entry; 1164f470021aSRoland McGrath 1165ca0002a1SMarkus Metzger #ifdef CONFIG_X86_PTRACE_BTS 1166ca0002a1SMarkus Metzger /* 1167ca0002a1SMarkus Metzger * This is the tracer handle for the ptrace BTS extension. 1168ca0002a1SMarkus Metzger * This field actually belongs to the ptracer task. 1169ca0002a1SMarkus Metzger */ 1170ca0002a1SMarkus Metzger struct bts_tracer *bts; 11716abb11aeSMarkus Metzger /* 11726abb11aeSMarkus Metzger * The buffer to hold the BTS data. 11736abb11aeSMarkus Metzger */ 11746abb11aeSMarkus Metzger void *bts_buffer; 1175ca0002a1SMarkus Metzger #endif /* CONFIG_X86_PTRACE_BTS */ 1176ca0002a1SMarkus Metzger 11771da177e4SLinus Torvalds /* PID/PID hash table linkage. */ 117892476d7fSEric W. Biederman struct pid_link pids[PIDTYPE_MAX]; 117947e65328SOleg Nesterov struct list_head thread_group; 11801da177e4SLinus Torvalds 11811da177e4SLinus Torvalds struct completion *vfork_done; /* for vfork() */ 11821da177e4SLinus Torvalds int __user *set_child_tid; /* CLONE_CHILD_SETTID */ 11831da177e4SLinus Torvalds int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ 11841da177e4SLinus Torvalds 1185c66f08beSMichael Neuling cputime_t utime, stime, utimescaled, stimescaled; 11869ac52315SLaurent Vivier cputime_t gtime; 11879301899bSBalbir Singh cputime_t prev_utime, prev_stime; 11881da177e4SLinus Torvalds unsigned long nvcsw, nivcsw; /* context switch counts */ 1189924b42d5STomas Janousek struct timespec start_time; /* monotonic time */ 1190924b42d5STomas Janousek struct timespec real_start_time; /* boot based time */ 11911da177e4SLinus Torvalds /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ 11921da177e4SLinus Torvalds unsigned long min_flt, maj_flt; 11931da177e4SLinus Torvalds 1194f06febc9SFrank Mayhar struct task_cputime cputime_expires; 11951da177e4SLinus Torvalds struct list_head cpu_timers[3]; 11961da177e4SLinus Torvalds 11971da177e4SLinus Torvalds /* process credentials */ 11981da177e4SLinus Torvalds uid_t uid,euid,suid,fsuid; 11991da177e4SLinus Torvalds gid_t gid,egid,sgid,fsgid; 12001da177e4SLinus Torvalds struct group_info *group_info; 12013b7391deSSerge E. Hallyn kernel_cap_t cap_effective, cap_inheritable, cap_permitted, cap_bset; 12021da177e4SLinus Torvalds struct user_struct *user; 1203c7aceabaSRichard Kennedy unsigned securebits; 12041da177e4SLinus Torvalds #ifdef CONFIG_KEYS 1205c7aceabaSRichard Kennedy unsigned char jit_keyring; /* default keyring to attach requested keys to */ 1206b5f545c8SDavid Howells struct key *request_key_auth; /* assumed request_key authority */ 12071da177e4SLinus Torvalds struct key *thread_keyring; /* keyring private to this thread */ 12081da177e4SLinus Torvalds #endif 120936772092SPaolo 'Blaisorblade' Giarrusso char comm[TASK_COMM_LEN]; /* executable name excluding path 121036772092SPaolo 'Blaisorblade' Giarrusso - access with [gs]et_task_comm (which lock 121136772092SPaolo 'Blaisorblade' Giarrusso it with task_lock()) 121236772092SPaolo 'Blaisorblade' Giarrusso - initialized normally by flush_old_exec */ 12131da177e4SLinus Torvalds /* file system info */ 12141da177e4SLinus Torvalds int link_count, total_link_count; 12153d5b6fccSAlexey Dobriyan #ifdef CONFIG_SYSVIPC 12161da177e4SLinus Torvalds /* ipc stuff */ 12171da177e4SLinus Torvalds struct sysv_sem sysvsem; 12183d5b6fccSAlexey Dobriyan #endif 121982a1fcb9SIngo Molnar #ifdef CONFIG_DETECT_SOFTLOCKUP 122082a1fcb9SIngo Molnar /* hung task detection */ 122182a1fcb9SIngo Molnar unsigned long last_switch_timestamp; 122282a1fcb9SIngo Molnar unsigned long last_switch_count; 122382a1fcb9SIngo Molnar #endif 12241da177e4SLinus Torvalds /* CPU-specific state of this task */ 12251da177e4SLinus Torvalds struct thread_struct thread; 12261da177e4SLinus Torvalds /* filesystem information */ 12271da177e4SLinus Torvalds struct fs_struct *fs; 12281da177e4SLinus Torvalds /* open file information */ 12291da177e4SLinus Torvalds struct files_struct *files; 12301651e14eSSerge E. Hallyn /* namespaces */ 1231ab516013SSerge E. Hallyn struct nsproxy *nsproxy; 12321da177e4SLinus Torvalds /* signal handlers */ 12331da177e4SLinus Torvalds struct signal_struct *signal; 12341da177e4SLinus Torvalds struct sighand_struct *sighand; 12351da177e4SLinus Torvalds 12361da177e4SLinus Torvalds sigset_t blocked, real_blocked; 1237f3de272bSRoland McGrath sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ 12381da177e4SLinus Torvalds struct sigpending pending; 12391da177e4SLinus Torvalds 12401da177e4SLinus Torvalds unsigned long sas_ss_sp; 12411da177e4SLinus Torvalds size_t sas_ss_size; 12421da177e4SLinus Torvalds int (*notifier)(void *priv); 12431da177e4SLinus Torvalds void *notifier_data; 12441da177e4SLinus Torvalds sigset_t *notifier_mask; 124557c521ceSAlexey Dobriyan #ifdef CONFIG_SECURITY 12461da177e4SLinus Torvalds void *security; 124757c521ceSAlexey Dobriyan #endif 12481da177e4SLinus Torvalds struct audit_context *audit_context; 1249bfef93a5SAl Viro #ifdef CONFIG_AUDITSYSCALL 1250bfef93a5SAl Viro uid_t loginuid; 12514746ec5bSEric Paris unsigned int sessionid; 1252bfef93a5SAl Viro #endif 12531da177e4SLinus Torvalds seccomp_t seccomp; 12541da177e4SLinus Torvalds 12551da177e4SLinus Torvalds /* Thread group tracking */ 12561da177e4SLinus Torvalds u32 parent_exec_id; 12571da177e4SLinus Torvalds u32 self_exec_id; 12581da177e4SLinus Torvalds /* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ 12591da177e4SLinus Torvalds spinlock_t alloc_lock; 12601da177e4SLinus Torvalds 1261b29739f9SIngo Molnar /* Protection of the PI data structures: */ 1262b29739f9SIngo Molnar spinlock_t pi_lock; 1263b29739f9SIngo Molnar 126423f78d4aSIngo Molnar #ifdef CONFIG_RT_MUTEXES 126523f78d4aSIngo Molnar /* PI waiters blocked on a rt_mutex held by this task */ 126623f78d4aSIngo Molnar struct plist_head pi_waiters; 126723f78d4aSIngo Molnar /* Deadlock detection and priority inheritance handling */ 126823f78d4aSIngo Molnar struct rt_mutex_waiter *pi_blocked_on; 126923f78d4aSIngo Molnar #endif 127023f78d4aSIngo Molnar 1271408894eeSIngo Molnar #ifdef CONFIG_DEBUG_MUTEXES 1272408894eeSIngo Molnar /* mutex deadlock detection */ 1273408894eeSIngo Molnar struct mutex_waiter *blocked_on; 1274408894eeSIngo Molnar #endif 1275de30a2b3SIngo Molnar #ifdef CONFIG_TRACE_IRQFLAGS 1276de30a2b3SIngo Molnar unsigned int irq_events; 1277de30a2b3SIngo Molnar int hardirqs_enabled; 1278de30a2b3SIngo Molnar unsigned long hardirq_enable_ip; 1279de30a2b3SIngo Molnar unsigned int hardirq_enable_event; 1280de30a2b3SIngo Molnar unsigned long hardirq_disable_ip; 1281de30a2b3SIngo Molnar unsigned int hardirq_disable_event; 1282de30a2b3SIngo Molnar int softirqs_enabled; 1283de30a2b3SIngo Molnar unsigned long softirq_disable_ip; 1284de30a2b3SIngo Molnar unsigned int softirq_disable_event; 1285de30a2b3SIngo Molnar unsigned long softirq_enable_ip; 1286de30a2b3SIngo Molnar unsigned int softirq_enable_event; 1287de30a2b3SIngo Molnar int hardirq_context; 1288de30a2b3SIngo Molnar int softirq_context; 1289de30a2b3SIngo Molnar #endif 1290fbb9ce95SIngo Molnar #ifdef CONFIG_LOCKDEP 1291bdb9441eSPeter Zijlstra # define MAX_LOCK_DEPTH 48UL 1292fbb9ce95SIngo Molnar u64 curr_chain_key; 1293fbb9ce95SIngo Molnar int lockdep_depth; 1294fbb9ce95SIngo Molnar unsigned int lockdep_recursion; 1295c7aceabaSRichard Kennedy struct held_lock held_locks[MAX_LOCK_DEPTH]; 1296fbb9ce95SIngo Molnar #endif 1297408894eeSIngo Molnar 12981da177e4SLinus Torvalds /* journalling filesystem info */ 12991da177e4SLinus Torvalds void *journal_info; 13001da177e4SLinus Torvalds 1301d89d8796SNeil Brown /* stacked block device info */ 1302d89d8796SNeil Brown struct bio *bio_list, **bio_tail; 1303d89d8796SNeil Brown 13041da177e4SLinus Torvalds /* VM state */ 13051da177e4SLinus Torvalds struct reclaim_state *reclaim_state; 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds struct backing_dev_info *backing_dev_info; 13081da177e4SLinus Torvalds 13091da177e4SLinus Torvalds struct io_context *io_context; 13101da177e4SLinus Torvalds 13111da177e4SLinus Torvalds unsigned long ptrace_message; 13121da177e4SLinus Torvalds siginfo_t *last_siginfo; /* For ptrace use. */ 1313940389b8SAndrea Righi struct task_io_accounting ioac; 13148f0ab514SJay Lan #if defined(CONFIG_TASK_XACCT) 13151da177e4SLinus Torvalds u64 acct_rss_mem1; /* accumulated rss usage */ 13161da177e4SLinus Torvalds u64 acct_vm_mem1; /* accumulated virtual memory usage */ 131749b5cf34SJonathan Lim cputime_t acct_timexpd; /* stime + utime since last update */ 13181da177e4SLinus Torvalds #endif 13191da177e4SLinus Torvalds #ifdef CONFIG_CPUSETS 13201da177e4SLinus Torvalds nodemask_t mems_allowed; 13211da177e4SLinus Torvalds int cpuset_mems_generation; 1322825a46afSPaul Jackson int cpuset_mem_spread_rotor; 13231da177e4SLinus Torvalds #endif 1324ddbcc7e8SPaul Menage #ifdef CONFIG_CGROUPS 1325817929ecSPaul Menage /* Control Group info protected by css_set_lock */ 1326817929ecSPaul Menage struct css_set *cgroups; 1327817929ecSPaul Menage /* cg_list protected by css_set_lock and tsk->alloc_lock */ 1328817929ecSPaul Menage struct list_head cg_list; 1329ddbcc7e8SPaul Menage #endif 133042b2dd0aSAlexey Dobriyan #ifdef CONFIG_FUTEX 13310771dfefSIngo Molnar struct robust_list_head __user *robust_list; 133234f192c6SIngo Molnar #ifdef CONFIG_COMPAT 133334f192c6SIngo Molnar struct compat_robust_list_head __user *compat_robust_list; 133434f192c6SIngo Molnar #endif 1335c87e2837SIngo Molnar struct list_head pi_state_list; 1336c87e2837SIngo Molnar struct futex_pi_state *pi_state_cache; 133742b2dd0aSAlexey Dobriyan #endif 1338c7aceabaSRichard Kennedy #ifdef CONFIG_NUMA 1339c7aceabaSRichard Kennedy struct mempolicy *mempolicy; 1340c7aceabaSRichard Kennedy short il_next; 1341c7aceabaSRichard Kennedy #endif 134222e2c507SJens Axboe atomic_t fs_excl; /* holding fs exclusive resources */ 1343e56d0903SIngo Molnar struct rcu_head rcu; 1344b92ce558SJens Axboe 1345b92ce558SJens Axboe /* 1346b92ce558SJens Axboe * cache last used pipe for splice 1347b92ce558SJens Axboe */ 1348b92ce558SJens Axboe struct pipe_inode_info *splice_pipe; 1349ca74e92bSShailabh Nagar #ifdef CONFIG_TASK_DELAY_ACCT 1350ca74e92bSShailabh Nagar struct task_delay_info *delays; 1351ca74e92bSShailabh Nagar #endif 1352f4f154fdSAkinobu Mita #ifdef CONFIG_FAULT_INJECTION 1353f4f154fdSAkinobu Mita int make_it_fail; 1354f4f154fdSAkinobu Mita #endif 13553e26c149SPeter Zijlstra struct prop_local_single dirties; 13569745512cSArjan van de Ven #ifdef CONFIG_LATENCYTOP 13579745512cSArjan van de Ven int latency_record_count; 13589745512cSArjan van de Ven struct latency_record latency_record[LT_SAVECOUNT]; 13599745512cSArjan van de Ven #endif 13606976675dSArjan van de Ven /* 13616976675dSArjan van de Ven * time slack values; these are used to round up poll() and 13626976675dSArjan van de Ven * select() etc timeout values. These are in nanoseconds. 13636976675dSArjan van de Ven */ 13646976675dSArjan van de Ven unsigned long timer_slack_ns; 13656976675dSArjan van de Ven unsigned long default_timer_slack_ns; 1366f8d570a4SDavid Miller 1367f8d570a4SDavid Miller struct list_head *scm_work_list; 1368*fb52607aSFrederic Weisbecker #ifdef CONFIG_FUNCTION_GRAPH_TRACER 1369f201ae23SFrederic Weisbecker /* Index of current stored adress in ret_stack */ 1370f201ae23SFrederic Weisbecker int curr_ret_stack; 1371f201ae23SFrederic Weisbecker /* Stack of return addresses for return function tracing */ 1372f201ae23SFrederic Weisbecker struct ftrace_ret_stack *ret_stack; 1373f201ae23SFrederic Weisbecker /* 1374f201ae23SFrederic Weisbecker * Number of functions that haven't been traced 1375f201ae23SFrederic Weisbecker * because of depth overrun. 1376f201ae23SFrederic Weisbecker */ 1377f201ae23SFrederic Weisbecker atomic_t trace_overrun; 1378f201ae23SFrederic Weisbecker #endif 13791da177e4SLinus Torvalds }; 13801da177e4SLinus Torvalds 1381e05606d3SIngo Molnar /* 1382e05606d3SIngo Molnar * Priority of a process goes from 0..MAX_PRIO-1, valid RT 1383e05606d3SIngo Molnar * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH 1384e05606d3SIngo Molnar * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority 1385e05606d3SIngo Molnar * values are inverted: lower p->prio value means higher priority. 1386e05606d3SIngo Molnar * 1387e05606d3SIngo Molnar * The MAX_USER_RT_PRIO value allows the actual maximum 1388e05606d3SIngo Molnar * RT priority to be separate from the value exported to 1389e05606d3SIngo Molnar * user-space. This allows kernel threads to set their 1390e05606d3SIngo Molnar * priority to a value higher than any user task. Note: 1391e05606d3SIngo Molnar * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. 1392e05606d3SIngo Molnar */ 1393e05606d3SIngo Molnar 1394e05606d3SIngo Molnar #define MAX_USER_RT_PRIO 100 1395e05606d3SIngo Molnar #define MAX_RT_PRIO MAX_USER_RT_PRIO 1396e05606d3SIngo Molnar 1397e05606d3SIngo Molnar #define MAX_PRIO (MAX_RT_PRIO + 40) 1398e05606d3SIngo Molnar #define DEFAULT_PRIO (MAX_RT_PRIO + 20) 1399e05606d3SIngo Molnar 1400e05606d3SIngo Molnar static inline int rt_prio(int prio) 1401e05606d3SIngo Molnar { 1402e05606d3SIngo Molnar if (unlikely(prio < MAX_RT_PRIO)) 1403e05606d3SIngo Molnar return 1; 1404e05606d3SIngo Molnar return 0; 1405e05606d3SIngo Molnar } 1406e05606d3SIngo Molnar 1407e868171aSAlexey Dobriyan static inline int rt_task(struct task_struct *p) 1408e05606d3SIngo Molnar { 1409e05606d3SIngo Molnar return rt_prio(p->prio); 1410e05606d3SIngo Molnar } 1411e05606d3SIngo Molnar 1412a47afb0fSPavel Emelianov static inline void set_task_session(struct task_struct *tsk, pid_t session) 1413937949d9SCedric Le Goater { 1414a47afb0fSPavel Emelianov tsk->signal->__session = session; 1415937949d9SCedric Le Goater } 1416937949d9SCedric Le Goater 14179a2e7057SPavel Emelyanov static inline void set_task_pgrp(struct task_struct *tsk, pid_t pgrp) 14189a2e7057SPavel Emelyanov { 14199a2e7057SPavel Emelyanov tsk->signal->__pgrp = pgrp; 14209a2e7057SPavel Emelyanov } 14219a2e7057SPavel Emelyanov 1422e868171aSAlexey Dobriyan static inline struct pid *task_pid(struct task_struct *task) 142322c935f4SEric W. Biederman { 142422c935f4SEric W. Biederman return task->pids[PIDTYPE_PID].pid; 142522c935f4SEric W. Biederman } 142622c935f4SEric W. Biederman 1427e868171aSAlexey Dobriyan static inline struct pid *task_tgid(struct task_struct *task) 142822c935f4SEric W. Biederman { 142922c935f4SEric W. Biederman return task->group_leader->pids[PIDTYPE_PID].pid; 143022c935f4SEric W. Biederman } 143122c935f4SEric W. Biederman 1432e868171aSAlexey Dobriyan static inline struct pid *task_pgrp(struct task_struct *task) 143322c935f4SEric W. Biederman { 143422c935f4SEric W. Biederman return task->group_leader->pids[PIDTYPE_PGID].pid; 143522c935f4SEric W. Biederman } 143622c935f4SEric W. Biederman 1437e868171aSAlexey Dobriyan static inline struct pid *task_session(struct task_struct *task) 143822c935f4SEric W. Biederman { 143922c935f4SEric W. Biederman return task->group_leader->pids[PIDTYPE_SID].pid; 144022c935f4SEric W. Biederman } 144122c935f4SEric W. Biederman 14427af57294SPavel Emelyanov struct pid_namespace; 14437af57294SPavel Emelyanov 14447af57294SPavel Emelyanov /* 14457af57294SPavel Emelyanov * the helpers to get the task's different pids as they are seen 14467af57294SPavel Emelyanov * from various namespaces 14477af57294SPavel Emelyanov * 14487af57294SPavel Emelyanov * task_xid_nr() : global id, i.e. the id seen from the init namespace; 144944c4e1b2SEric W. Biederman * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of 145044c4e1b2SEric W. Biederman * current. 14517af57294SPavel Emelyanov * task_xid_nr_ns() : id seen from the ns specified; 14527af57294SPavel Emelyanov * 14537af57294SPavel Emelyanov * set_task_vxid() : assigns a virtual id to a task; 14547af57294SPavel Emelyanov * 14557af57294SPavel Emelyanov * see also pid_nr() etc in include/linux/pid.h 14567af57294SPavel Emelyanov */ 14577af57294SPavel Emelyanov 1458e868171aSAlexey Dobriyan static inline pid_t task_pid_nr(struct task_struct *tsk) 14597af57294SPavel Emelyanov { 14607af57294SPavel Emelyanov return tsk->pid; 14617af57294SPavel Emelyanov } 14627af57294SPavel Emelyanov 14632f2a3a46SPavel Emelyanov pid_t task_pid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 14647af57294SPavel Emelyanov 14657af57294SPavel Emelyanov static inline pid_t task_pid_vnr(struct task_struct *tsk) 14667af57294SPavel Emelyanov { 14677af57294SPavel Emelyanov return pid_vnr(task_pid(tsk)); 14687af57294SPavel Emelyanov } 14697af57294SPavel Emelyanov 14707af57294SPavel Emelyanov 1471e868171aSAlexey Dobriyan static inline pid_t task_tgid_nr(struct task_struct *tsk) 14727af57294SPavel Emelyanov { 14737af57294SPavel Emelyanov return tsk->tgid; 14747af57294SPavel Emelyanov } 14757af57294SPavel Emelyanov 14762f2a3a46SPavel Emelyanov pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 14777af57294SPavel Emelyanov 14787af57294SPavel Emelyanov static inline pid_t task_tgid_vnr(struct task_struct *tsk) 14797af57294SPavel Emelyanov { 14807af57294SPavel Emelyanov return pid_vnr(task_tgid(tsk)); 14817af57294SPavel Emelyanov } 14827af57294SPavel Emelyanov 14837af57294SPavel Emelyanov 1484e868171aSAlexey Dobriyan static inline pid_t task_pgrp_nr(struct task_struct *tsk) 14857af57294SPavel Emelyanov { 14869a2e7057SPavel Emelyanov return tsk->signal->__pgrp; 14877af57294SPavel Emelyanov } 14887af57294SPavel Emelyanov 14892f2a3a46SPavel Emelyanov pid_t task_pgrp_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 14907af57294SPavel Emelyanov 14917af57294SPavel Emelyanov static inline pid_t task_pgrp_vnr(struct task_struct *tsk) 14927af57294SPavel Emelyanov { 14937af57294SPavel Emelyanov return pid_vnr(task_pgrp(tsk)); 14947af57294SPavel Emelyanov } 14957af57294SPavel Emelyanov 14967af57294SPavel Emelyanov 1497e868171aSAlexey Dobriyan static inline pid_t task_session_nr(struct task_struct *tsk) 14987af57294SPavel Emelyanov { 14997af57294SPavel Emelyanov return tsk->signal->__session; 15007af57294SPavel Emelyanov } 15017af57294SPavel Emelyanov 15022f2a3a46SPavel Emelyanov pid_t task_session_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); 15037af57294SPavel Emelyanov 15047af57294SPavel Emelyanov static inline pid_t task_session_vnr(struct task_struct *tsk) 15057af57294SPavel Emelyanov { 15067af57294SPavel Emelyanov return pid_vnr(task_session(tsk)); 15077af57294SPavel Emelyanov } 15087af57294SPavel Emelyanov 15097af57294SPavel Emelyanov 15101da177e4SLinus Torvalds /** 15111da177e4SLinus Torvalds * pid_alive - check that a task structure is not stale 15121da177e4SLinus Torvalds * @p: Task structure to be checked. 15131da177e4SLinus Torvalds * 15141da177e4SLinus Torvalds * Test if a process is not yet dead (at most zombie state) 15151da177e4SLinus Torvalds * If pid_alive fails, then pointers within the task structure 15161da177e4SLinus Torvalds * can be stale and must not be dereferenced. 15171da177e4SLinus Torvalds */ 1518e868171aSAlexey Dobriyan static inline int pid_alive(struct task_struct *p) 15191da177e4SLinus Torvalds { 152092476d7fSEric W. Biederman return p->pids[PIDTYPE_PID].pid != NULL; 15211da177e4SLinus Torvalds } 15221da177e4SLinus Torvalds 1523f400e198SSukadev Bhattiprolu /** 1524b460cbc5SSerge E. Hallyn * is_global_init - check if a task structure is init 15253260259fSHenne * @tsk: Task structure to be checked. 15263260259fSHenne * 15273260259fSHenne * Check if a task structure is the first user space task the kernel created. 1528f400e198SSukadev Bhattiprolu */ 1529e868171aSAlexey Dobriyan static inline int is_global_init(struct task_struct *tsk) 1530b461cc03SPavel Emelyanov { 1531b461cc03SPavel Emelyanov return tsk->pid == 1; 1532b461cc03SPavel Emelyanov } 1533b460cbc5SSerge E. Hallyn 1534b460cbc5SSerge E. Hallyn /* 1535b460cbc5SSerge E. Hallyn * is_container_init: 1536b460cbc5SSerge E. Hallyn * check whether in the task is init in its own pid namespace. 1537b460cbc5SSerge E. Hallyn */ 1538b461cc03SPavel Emelyanov extern int is_container_init(struct task_struct *tsk); 1539f400e198SSukadev Bhattiprolu 15409ec52099SCedric Le Goater extern struct pid *cad_pid; 15419ec52099SCedric Le Goater 15421da177e4SLinus Torvalds extern void free_task(struct task_struct *tsk); 15431da177e4SLinus Torvalds #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) 1544e56d0903SIngo Molnar 1545158d9ebdSAndrew Morton extern void __put_task_struct(struct task_struct *t); 1546e56d0903SIngo Molnar 1547e56d0903SIngo Molnar static inline void put_task_struct(struct task_struct *t) 1548e56d0903SIngo Molnar { 1549e56d0903SIngo Molnar if (atomic_dec_and_test(&t->usage)) 15508c7904a0SEric W. Biederman __put_task_struct(t); 1551e56d0903SIngo Molnar } 15521da177e4SLinus Torvalds 155349048622SBalbir Singh extern cputime_t task_utime(struct task_struct *p); 155449048622SBalbir Singh extern cputime_t task_stime(struct task_struct *p); 155549048622SBalbir Singh extern cputime_t task_gtime(struct task_struct *p); 155649048622SBalbir Singh 15571da177e4SLinus Torvalds /* 15581da177e4SLinus Torvalds * Per process flags 15591da177e4SLinus Torvalds */ 15601da177e4SLinus Torvalds #define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ 15611da177e4SLinus Torvalds /* Not implemented yet, only for 486*/ 15621da177e4SLinus Torvalds #define PF_STARTING 0x00000002 /* being created */ 15631da177e4SLinus Torvalds #define PF_EXITING 0x00000004 /* getting shut down */ 1564778e9a9cSAlexey Kuznetsov #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ 156594886b84SLaurent Vivier #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ 15661da177e4SLinus Torvalds #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ 15671da177e4SLinus Torvalds #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ 15681da177e4SLinus Torvalds #define PF_DUMPCORE 0x00000200 /* dumped core */ 15691da177e4SLinus Torvalds #define PF_SIGNALED 0x00000400 /* killed by a signal */ 15701da177e4SLinus Torvalds #define PF_MEMALLOC 0x00000800 /* Allocating memory */ 15711da177e4SLinus Torvalds #define PF_FLUSHER 0x00001000 /* responsible for disk writeback */ 15721da177e4SLinus Torvalds #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ 15731da177e4SLinus Torvalds #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ 15741da177e4SLinus Torvalds #define PF_FROZEN 0x00010000 /* frozen for system suspend */ 15751da177e4SLinus Torvalds #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ 15761da177e4SLinus Torvalds #define PF_KSWAPD 0x00040000 /* I am kswapd */ 15771da177e4SLinus Torvalds #define PF_SWAPOFF 0x00080000 /* I am in swapoff */ 15781da177e4SLinus Torvalds #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ 1579246bb0b1SOleg Nesterov #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ 1580b31dc66aSJens Axboe #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ 1581b31dc66aSJens Axboe #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ 1582b31dc66aSJens Axboe #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ 1583b31dc66aSJens Axboe #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ 15849985b0baSDavid Rientjes #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ 1585c61afb18SPaul Jackson #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ 158661a87122SThomas Gleixner #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ 1587ba96a0c8SRafael J. Wysocki #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezeable */ 1588ebb12db5SRafael J. Wysocki #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ 15891da177e4SLinus Torvalds 15901da177e4SLinus Torvalds /* 15911da177e4SLinus Torvalds * Only the _current_ task can read/write to tsk->flags, but other 15921da177e4SLinus Torvalds * tasks can access tsk->flags in readonly mode for example 15931da177e4SLinus Torvalds * with tsk_used_math (like during threaded core dumping). 15941da177e4SLinus Torvalds * There is however an exception to this rule during ptrace 15951da177e4SLinus Torvalds * or during fork: the ptracer task is allowed to write to the 15961da177e4SLinus Torvalds * child->flags of its traced child (same goes for fork, the parent 15971da177e4SLinus Torvalds * can write to the child->flags), because we're guaranteed the 15981da177e4SLinus Torvalds * child is not running and in turn not changing child->flags 15991da177e4SLinus Torvalds * at the same time the parent does it. 16001da177e4SLinus Torvalds */ 16011da177e4SLinus Torvalds #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) 16021da177e4SLinus Torvalds #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) 16031da177e4SLinus Torvalds #define clear_used_math() clear_stopped_child_used_math(current) 16041da177e4SLinus Torvalds #define set_used_math() set_stopped_child_used_math(current) 16051da177e4SLinus Torvalds #define conditional_stopped_child_used_math(condition, child) \ 16061da177e4SLinus Torvalds do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) 16071da177e4SLinus Torvalds #define conditional_used_math(condition) \ 16081da177e4SLinus Torvalds conditional_stopped_child_used_math(condition, current) 16091da177e4SLinus Torvalds #define copy_to_stopped_child_used_math(child) \ 16101da177e4SLinus Torvalds do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) 16111da177e4SLinus Torvalds /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ 16121da177e4SLinus Torvalds #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) 16131da177e4SLinus Torvalds #define used_math() tsk_used_math(current) 16141da177e4SLinus Torvalds 16151da177e4SLinus Torvalds #ifdef CONFIG_SMP 1616cd8ba7cdSMike Travis extern int set_cpus_allowed_ptr(struct task_struct *p, 1617cd8ba7cdSMike Travis const cpumask_t *new_mask); 16181da177e4SLinus Torvalds #else 1619cd8ba7cdSMike Travis static inline int set_cpus_allowed_ptr(struct task_struct *p, 1620cd8ba7cdSMike Travis const cpumask_t *new_mask) 16211da177e4SLinus Torvalds { 1622cd8ba7cdSMike Travis if (!cpu_isset(0, *new_mask)) 16231da177e4SLinus Torvalds return -EINVAL; 16241da177e4SLinus Torvalds return 0; 16251da177e4SLinus Torvalds } 16261da177e4SLinus Torvalds #endif 1627cd8ba7cdSMike Travis static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) 1628cd8ba7cdSMike Travis { 1629cd8ba7cdSMike Travis return set_cpus_allowed_ptr(p, &new_mask); 1630cd8ba7cdSMike Travis } 16311da177e4SLinus Torvalds 16321da177e4SLinus Torvalds extern unsigned long long sched_clock(void); 1633e436d800SIngo Molnar 1634c1955a3dSPeter Zijlstra extern void sched_clock_init(void); 1635c1955a3dSPeter Zijlstra extern u64 sched_clock_cpu(int cpu); 1636c1955a3dSPeter Zijlstra 16373e51f33fSPeter Zijlstra #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK 16383e51f33fSPeter Zijlstra static inline void sched_clock_tick(void) 16393e51f33fSPeter Zijlstra { 16403e51f33fSPeter Zijlstra } 16413e51f33fSPeter Zijlstra 16423e51f33fSPeter Zijlstra static inline void sched_clock_idle_sleep_event(void) 16433e51f33fSPeter Zijlstra { 16443e51f33fSPeter Zijlstra } 16453e51f33fSPeter Zijlstra 16463e51f33fSPeter Zijlstra static inline void sched_clock_idle_wakeup_event(u64 delta_ns) 16473e51f33fSPeter Zijlstra { 16483e51f33fSPeter Zijlstra } 1649e4e4e534SIngo Molnar #else 16503e51f33fSPeter Zijlstra extern void sched_clock_tick(void); 16513e51f33fSPeter Zijlstra extern void sched_clock_idle_sleep_event(void); 16523e51f33fSPeter Zijlstra extern void sched_clock_idle_wakeup_event(u64 delta_ns); 16533e51f33fSPeter Zijlstra #endif 16543e51f33fSPeter Zijlstra 1655e436d800SIngo Molnar /* 1656e436d800SIngo Molnar * For kernel-internal use: high-speed (but slightly incorrect) per-cpu 1657e436d800SIngo Molnar * clock constructed from sched_clock(): 1658e436d800SIngo Molnar */ 1659e436d800SIngo Molnar extern unsigned long long cpu_clock(int cpu); 1660e436d800SIngo Molnar 166136c8b586SIngo Molnar extern unsigned long long 166241b86e9cSIngo Molnar task_sched_runtime(struct task_struct *task); 1663f06febc9SFrank Mayhar extern unsigned long long thread_group_sched_runtime(struct task_struct *task); 16641da177e4SLinus Torvalds 16651da177e4SLinus Torvalds /* sched_exec is called by processes performing an exec */ 16661da177e4SLinus Torvalds #ifdef CONFIG_SMP 16671da177e4SLinus Torvalds extern void sched_exec(void); 16681da177e4SLinus Torvalds #else 16691da177e4SLinus Torvalds #define sched_exec() {} 16701da177e4SLinus Torvalds #endif 16711da177e4SLinus Torvalds 16722aa44d05SIngo Molnar extern void sched_clock_idle_sleep_event(void); 16732aa44d05SIngo Molnar extern void sched_clock_idle_wakeup_event(u64 delta_ns); 1674bb29ab26SIngo Molnar 16751da177e4SLinus Torvalds #ifdef CONFIG_HOTPLUG_CPU 16761da177e4SLinus Torvalds extern void idle_task_exit(void); 16771da177e4SLinus Torvalds #else 16781da177e4SLinus Torvalds static inline void idle_task_exit(void) {} 16791da177e4SLinus Torvalds #endif 16801da177e4SLinus Torvalds 16811da177e4SLinus Torvalds extern void sched_idle_next(void); 1682b29739f9SIngo Molnar 168306d8308cSThomas Gleixner #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) 168406d8308cSThomas Gleixner extern void wake_up_idle_cpu(int cpu); 168506d8308cSThomas Gleixner #else 168606d8308cSThomas Gleixner static inline void wake_up_idle_cpu(int cpu) { } 168706d8308cSThomas Gleixner #endif 168806d8308cSThomas Gleixner 16892bd8e6d4SIngo Molnar #ifdef CONFIG_SCHED_DEBUG 169021805085SPeter Zijlstra extern unsigned int sysctl_sched_latency; 1691b2be5e96SPeter Zijlstra extern unsigned int sysctl_sched_min_granularity; 1692bf0f6f24SIngo Molnar extern unsigned int sysctl_sched_wakeup_granularity; 1693bf0f6f24SIngo Molnar extern unsigned int sysctl_sched_child_runs_first; 1694bf0f6f24SIngo Molnar extern unsigned int sysctl_sched_features; 1695da84d961SIngo Molnar extern unsigned int sysctl_sched_migration_cost; 1696b82d9fddSPeter Zijlstra extern unsigned int sysctl_sched_nr_migrate; 16972398f2c6SPeter Zijlstra extern unsigned int sysctl_sched_shares_ratelimit; 1698ffda12a1SPeter Zijlstra extern unsigned int sysctl_sched_shares_thresh; 1699b2be5e96SPeter Zijlstra 1700b2be5e96SPeter Zijlstra int sched_nr_latency_handler(struct ctl_table *table, int write, 1701b2be5e96SPeter Zijlstra struct file *file, void __user *buffer, size_t *length, 1702b2be5e96SPeter Zijlstra loff_t *ppos); 17032bd8e6d4SIngo Molnar #endif 17049f0c1e56SPeter Zijlstra extern unsigned int sysctl_sched_rt_period; 17059f0c1e56SPeter Zijlstra extern int sysctl_sched_rt_runtime; 17062bd8e6d4SIngo Molnar 1707d0b27fa7SPeter Zijlstra int sched_rt_handler(struct ctl_table *table, int write, 1708d0b27fa7SPeter Zijlstra struct file *filp, void __user *buffer, size_t *lenp, 1709d0b27fa7SPeter Zijlstra loff_t *ppos); 1710d0b27fa7SPeter Zijlstra 17112bd8e6d4SIngo Molnar extern unsigned int sysctl_sched_compat_yield; 1712bf0f6f24SIngo Molnar 1713b29739f9SIngo Molnar #ifdef CONFIG_RT_MUTEXES 171436c8b586SIngo Molnar extern int rt_mutex_getprio(struct task_struct *p); 171536c8b586SIngo Molnar extern void rt_mutex_setprio(struct task_struct *p, int prio); 171636c8b586SIngo Molnar extern void rt_mutex_adjust_pi(struct task_struct *p); 1717b29739f9SIngo Molnar #else 1718e868171aSAlexey Dobriyan static inline int rt_mutex_getprio(struct task_struct *p) 1719b29739f9SIngo Molnar { 1720b29739f9SIngo Molnar return p->normal_prio; 1721b29739f9SIngo Molnar } 172295e02ca9SThomas Gleixner # define rt_mutex_adjust_pi(p) do { } while (0) 1723b29739f9SIngo Molnar #endif 1724b29739f9SIngo Molnar 172536c8b586SIngo Molnar extern void set_user_nice(struct task_struct *p, long nice); 172636c8b586SIngo Molnar extern int task_prio(const struct task_struct *p); 172736c8b586SIngo Molnar extern int task_nice(const struct task_struct *p); 172836c8b586SIngo Molnar extern int can_nice(const struct task_struct *p, const int nice); 172936c8b586SIngo Molnar extern int task_curr(const struct task_struct *p); 17301da177e4SLinus Torvalds extern int idle_cpu(int cpu); 17311da177e4SLinus Torvalds extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); 1732961ccdddSRusty Russell extern int sched_setscheduler_nocheck(struct task_struct *, int, 1733961ccdddSRusty Russell struct sched_param *); 173436c8b586SIngo Molnar extern struct task_struct *idle_task(int cpu); 173536c8b586SIngo Molnar extern struct task_struct *curr_task(int cpu); 173636c8b586SIngo Molnar extern void set_curr_task(int cpu, struct task_struct *p); 17371da177e4SLinus Torvalds 17381da177e4SLinus Torvalds void yield(void); 17391da177e4SLinus Torvalds 17401da177e4SLinus Torvalds /* 17411da177e4SLinus Torvalds * The default (Linux) execution domain. 17421da177e4SLinus Torvalds */ 17431da177e4SLinus Torvalds extern struct exec_domain default_exec_domain; 17441da177e4SLinus Torvalds 17451da177e4SLinus Torvalds union thread_union { 17461da177e4SLinus Torvalds struct thread_info thread_info; 17471da177e4SLinus Torvalds unsigned long stack[THREAD_SIZE/sizeof(long)]; 17481da177e4SLinus Torvalds }; 17491da177e4SLinus Torvalds 17501da177e4SLinus Torvalds #ifndef __HAVE_ARCH_KSTACK_END 17511da177e4SLinus Torvalds static inline int kstack_end(void *addr) 17521da177e4SLinus Torvalds { 17531da177e4SLinus Torvalds /* Reliable end of stack detection: 17541da177e4SLinus Torvalds * Some APM bios versions misalign the stack 17551da177e4SLinus Torvalds */ 17561da177e4SLinus Torvalds return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); 17571da177e4SLinus Torvalds } 17581da177e4SLinus Torvalds #endif 17591da177e4SLinus Torvalds 17601da177e4SLinus Torvalds extern union thread_union init_thread_union; 17611da177e4SLinus Torvalds extern struct task_struct init_task; 17621da177e4SLinus Torvalds 17631da177e4SLinus Torvalds extern struct mm_struct init_mm; 17641da177e4SLinus Torvalds 1765198fe21bSPavel Emelyanov extern struct pid_namespace init_pid_ns; 1766198fe21bSPavel Emelyanov 1767198fe21bSPavel Emelyanov /* 1768198fe21bSPavel Emelyanov * find a task by one of its numerical ids 1769198fe21bSPavel Emelyanov * 1770198fe21bSPavel Emelyanov * find_task_by_pid_type_ns(): 1771198fe21bSPavel Emelyanov * it is the most generic call - it finds a task by all id, 1772198fe21bSPavel Emelyanov * type and namespace specified 1773198fe21bSPavel Emelyanov * find_task_by_pid_ns(): 1774198fe21bSPavel Emelyanov * finds a task by its pid in the specified namespace 1775228ebcbeSPavel Emelyanov * find_task_by_vpid(): 1776228ebcbeSPavel Emelyanov * finds a task by its virtual pid 1777198fe21bSPavel Emelyanov * 1778e49859e7SPavel Emelyanov * see also find_vpid() etc in include/linux/pid.h 1779198fe21bSPavel Emelyanov */ 1780198fe21bSPavel Emelyanov 1781198fe21bSPavel Emelyanov extern struct task_struct *find_task_by_pid_type_ns(int type, int pid, 1782198fe21bSPavel Emelyanov struct pid_namespace *ns); 1783198fe21bSPavel Emelyanov 1784228ebcbeSPavel Emelyanov extern struct task_struct *find_task_by_vpid(pid_t nr); 1785228ebcbeSPavel Emelyanov extern struct task_struct *find_task_by_pid_ns(pid_t nr, 1786228ebcbeSPavel Emelyanov struct pid_namespace *ns); 1787198fe21bSPavel Emelyanov 17888520d7c7SOleg Nesterov extern void __set_special_pids(struct pid *pid); 17891da177e4SLinus Torvalds 17901da177e4SLinus Torvalds /* per-UID process charging. */ 1791acce292cSCedric Le Goater extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); 17921da177e4SLinus Torvalds static inline struct user_struct *get_uid(struct user_struct *u) 17931da177e4SLinus Torvalds { 17941da177e4SLinus Torvalds atomic_inc(&u->__count); 17951da177e4SLinus Torvalds return u; 17961da177e4SLinus Torvalds } 17971da177e4SLinus Torvalds extern void free_uid(struct user_struct *); 17981da177e4SLinus Torvalds extern void switch_uid(struct user_struct *); 179928f300d2SPavel Emelyanov extern void release_uids(struct user_namespace *ns); 18001da177e4SLinus Torvalds 18011da177e4SLinus Torvalds #include <asm/current.h> 18021da177e4SLinus Torvalds 18033171a030SAtsushi Nemoto extern void do_timer(unsigned long ticks); 18041da177e4SLinus Torvalds 1805b3c97528SHarvey Harrison extern int wake_up_state(struct task_struct *tsk, unsigned int state); 1806b3c97528SHarvey Harrison extern int wake_up_process(struct task_struct *tsk); 1807b3c97528SHarvey Harrison extern void wake_up_new_task(struct task_struct *tsk, 1808b3c97528SHarvey Harrison unsigned long clone_flags); 18091da177e4SLinus Torvalds #ifdef CONFIG_SMP 18101da177e4SLinus Torvalds extern void kick_process(struct task_struct *tsk); 18111da177e4SLinus Torvalds #else 18121da177e4SLinus Torvalds static inline void kick_process(struct task_struct *tsk) { } 18131da177e4SLinus Torvalds #endif 1814ad46c2c4SIngo Molnar extern void sched_fork(struct task_struct *p, int clone_flags); 1815ad46c2c4SIngo Molnar extern void sched_dead(struct task_struct *p); 18161da177e4SLinus Torvalds 18171da177e4SLinus Torvalds extern int in_group_p(gid_t); 18181da177e4SLinus Torvalds extern int in_egroup_p(gid_t); 18191da177e4SLinus Torvalds 18201da177e4SLinus Torvalds extern void proc_caches_init(void); 18211da177e4SLinus Torvalds extern void flush_signals(struct task_struct *); 182210ab825bSOleg Nesterov extern void ignore_signals(struct task_struct *); 18231da177e4SLinus Torvalds extern void flush_signal_handlers(struct task_struct *, int force_default); 18241da177e4SLinus Torvalds extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); 18251da177e4SLinus Torvalds 18261da177e4SLinus Torvalds static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) 18271da177e4SLinus Torvalds { 18281da177e4SLinus Torvalds unsigned long flags; 18291da177e4SLinus Torvalds int ret; 18301da177e4SLinus Torvalds 18311da177e4SLinus Torvalds spin_lock_irqsave(&tsk->sighand->siglock, flags); 18321da177e4SLinus Torvalds ret = dequeue_signal(tsk, mask, info); 18331da177e4SLinus Torvalds spin_unlock_irqrestore(&tsk->sighand->siglock, flags); 18341da177e4SLinus Torvalds 18351da177e4SLinus Torvalds return ret; 18361da177e4SLinus Torvalds } 18371da177e4SLinus Torvalds 18381da177e4SLinus Torvalds extern void block_all_signals(int (*notifier)(void *priv), void *priv, 18391da177e4SLinus Torvalds sigset_t *mask); 18401da177e4SLinus Torvalds extern void unblock_all_signals(void); 18411da177e4SLinus Torvalds extern void release_task(struct task_struct * p); 18421da177e4SLinus Torvalds extern int send_sig_info(int, struct siginfo *, struct task_struct *); 18431da177e4SLinus Torvalds extern int force_sigsegv(int, struct task_struct *); 18441da177e4SLinus Torvalds extern int force_sig_info(int, struct siginfo *, struct task_struct *); 1845c4b92fc1SEric W. Biederman extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); 1846c4b92fc1SEric W. Biederman extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); 18472425c08bSEric W. Biederman extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); 1848c4b92fc1SEric W. Biederman extern int kill_pgrp(struct pid *pid, int sig, int priv); 1849c4b92fc1SEric W. Biederman extern int kill_pid(struct pid *pid, int sig, int priv); 1850c3de4b38SMatthew Wilcox extern int kill_proc_info(int, struct siginfo *, pid_t); 18512b2a1ff6SRoland McGrath extern int do_notify_parent(struct task_struct *, int); 18521da177e4SLinus Torvalds extern void force_sig(int, struct task_struct *); 18531da177e4SLinus Torvalds extern void force_sig_specific(int, struct task_struct *); 18541da177e4SLinus Torvalds extern int send_sig(int, struct task_struct *, int); 18551da177e4SLinus Torvalds extern void zap_other_threads(struct task_struct *p); 18561da177e4SLinus Torvalds extern struct sigqueue *sigqueue_alloc(void); 18571da177e4SLinus Torvalds extern void sigqueue_free(struct sigqueue *); 1858ac5c2153SOleg Nesterov extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); 18599ac95f2fSOleg Nesterov extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); 18601da177e4SLinus Torvalds extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); 18611da177e4SLinus Torvalds 18629ec52099SCedric Le Goater static inline int kill_cad_pid(int sig, int priv) 18639ec52099SCedric Le Goater { 18649ec52099SCedric Le Goater return kill_pid(cad_pid, sig, priv); 18659ec52099SCedric Le Goater } 18669ec52099SCedric Le Goater 18671da177e4SLinus Torvalds /* These can be the second arg to send_sig_info/send_group_sig_info. */ 18681da177e4SLinus Torvalds #define SEND_SIG_NOINFO ((struct siginfo *) 0) 18691da177e4SLinus Torvalds #define SEND_SIG_PRIV ((struct siginfo *) 1) 18701da177e4SLinus Torvalds #define SEND_SIG_FORCED ((struct siginfo *) 2) 18711da177e4SLinus Torvalds 1872621d3121SOleg Nesterov static inline int is_si_special(const struct siginfo *info) 1873621d3121SOleg Nesterov { 1874621d3121SOleg Nesterov return info <= SEND_SIG_FORCED; 1875621d3121SOleg Nesterov } 1876621d3121SOleg Nesterov 18771da177e4SLinus Torvalds /* True if we are on the alternate signal stack. */ 18781da177e4SLinus Torvalds 18791da177e4SLinus Torvalds static inline int on_sig_stack(unsigned long sp) 18801da177e4SLinus Torvalds { 18811da177e4SLinus Torvalds return (sp - current->sas_ss_sp < current->sas_ss_size); 18821da177e4SLinus Torvalds } 18831da177e4SLinus Torvalds 18841da177e4SLinus Torvalds static inline int sas_ss_flags(unsigned long sp) 18851da177e4SLinus Torvalds { 18861da177e4SLinus Torvalds return (current->sas_ss_size == 0 ? SS_DISABLE 18871da177e4SLinus Torvalds : on_sig_stack(sp) ? SS_ONSTACK : 0); 18881da177e4SLinus Torvalds } 18891da177e4SLinus Torvalds 18901da177e4SLinus Torvalds /* 18911da177e4SLinus Torvalds * Routines for handling mm_structs 18921da177e4SLinus Torvalds */ 18931da177e4SLinus Torvalds extern struct mm_struct * mm_alloc(void); 18941da177e4SLinus Torvalds 18951da177e4SLinus Torvalds /* mmdrop drops the mm and the page tables */ 1896b3c97528SHarvey Harrison extern void __mmdrop(struct mm_struct *); 18971da177e4SLinus Torvalds static inline void mmdrop(struct mm_struct * mm) 18981da177e4SLinus Torvalds { 18996fb43d7bSIngo Molnar if (unlikely(atomic_dec_and_test(&mm->mm_count))) 19001da177e4SLinus Torvalds __mmdrop(mm); 19011da177e4SLinus Torvalds } 19021da177e4SLinus Torvalds 19031da177e4SLinus Torvalds /* mmput gets rid of the mappings and all user-space */ 19041da177e4SLinus Torvalds extern void mmput(struct mm_struct *); 19051da177e4SLinus Torvalds /* Grab a reference to a task's mm, if it is not already going away */ 19061da177e4SLinus Torvalds extern struct mm_struct *get_task_mm(struct task_struct *task); 19071da177e4SLinus Torvalds /* Remove the current tasks stale references to the old mm_struct */ 19081da177e4SLinus Torvalds extern void mm_release(struct task_struct *, struct mm_struct *); 1909402b0862SCarsten Otte /* Allocate a new mm structure and copy contents from tsk->mm */ 1910402b0862SCarsten Otte extern struct mm_struct *dup_mm(struct task_struct *tsk); 19111da177e4SLinus Torvalds 19121da177e4SLinus Torvalds extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); 19131da177e4SLinus Torvalds extern void flush_thread(void); 19141da177e4SLinus Torvalds extern void exit_thread(void); 19151da177e4SLinus Torvalds 19161da177e4SLinus Torvalds extern void exit_files(struct task_struct *); 19176b3934efSOleg Nesterov extern void __cleanup_signal(struct signal_struct *); 1918a7e5328aSOleg Nesterov extern void __cleanup_sighand(struct sighand_struct *); 1919cbaffba1SOleg Nesterov 19201da177e4SLinus Torvalds extern void exit_itimers(struct signal_struct *); 1921cbaffba1SOleg Nesterov extern void flush_itimer_signals(void); 19221da177e4SLinus Torvalds 19231da177e4SLinus Torvalds extern NORET_TYPE void do_group_exit(int); 19241da177e4SLinus Torvalds 19251da177e4SLinus Torvalds extern void daemonize(const char *, ...); 19261da177e4SLinus Torvalds extern int allow_signal(int); 19271da177e4SLinus Torvalds extern int disallow_signal(int); 19281da177e4SLinus Torvalds 19291da177e4SLinus Torvalds extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); 19301da177e4SLinus Torvalds extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); 193136c8b586SIngo Molnar struct task_struct *fork_idle(int); 19321da177e4SLinus Torvalds 19331da177e4SLinus Torvalds extern void set_task_comm(struct task_struct *tsk, char *from); 193459714d65SAndrew Morton extern char *get_task_comm(char *to, struct task_struct *tsk); 19351da177e4SLinus Torvalds 19361da177e4SLinus Torvalds #ifdef CONFIG_SMP 193785ba2d86SRoland McGrath extern unsigned long wait_task_inactive(struct task_struct *, long match_state); 19381da177e4SLinus Torvalds #else 193985ba2d86SRoland McGrath static inline unsigned long wait_task_inactive(struct task_struct *p, 194085ba2d86SRoland McGrath long match_state) 194185ba2d86SRoland McGrath { 194285ba2d86SRoland McGrath return 1; 194385ba2d86SRoland McGrath } 19441da177e4SLinus Torvalds #endif 19451da177e4SLinus Torvalds 19465e85d4abSEric W. Biederman #define next_task(p) list_entry(rcu_dereference((p)->tasks.next), struct task_struct, tasks) 19471da177e4SLinus Torvalds 19481da177e4SLinus Torvalds #define for_each_process(p) \ 19491da177e4SLinus Torvalds for (p = &init_task ; (p = next_task(p)) != &init_task ; ) 19501da177e4SLinus Torvalds 19511da177e4SLinus Torvalds /* 19521da177e4SLinus Torvalds * Careful: do_each_thread/while_each_thread is a double loop so 19531da177e4SLinus Torvalds * 'break' will not work as expected - use goto instead. 19541da177e4SLinus Torvalds */ 19551da177e4SLinus Torvalds #define do_each_thread(g, t) \ 19561da177e4SLinus Torvalds for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do 19571da177e4SLinus Torvalds 19581da177e4SLinus Torvalds #define while_each_thread(g, t) \ 19591da177e4SLinus Torvalds while ((t = next_thread(t)) != g) 19601da177e4SLinus Torvalds 1961de12a787SEric W. Biederman /* de_thread depends on thread_group_leader not being a pid based check */ 1962de12a787SEric W. Biederman #define thread_group_leader(p) (p == p->group_leader) 19631da177e4SLinus Torvalds 19640804ef4bSEric W. Biederman /* Do to the insanities of de_thread it is possible for a process 19650804ef4bSEric W. Biederman * to have the pid of the thread group leader without actually being 19660804ef4bSEric W. Biederman * the thread group leader. For iteration through the pids in proc 19670804ef4bSEric W. Biederman * all we care about is that we have a task with the appropriate 19680804ef4bSEric W. Biederman * pid, we don't actually care if we have the right task. 19690804ef4bSEric W. Biederman */ 1970e868171aSAlexey Dobriyan static inline int has_group_leader_pid(struct task_struct *p) 19710804ef4bSEric W. Biederman { 19720804ef4bSEric W. Biederman return p->pid == p->tgid; 19730804ef4bSEric W. Biederman } 19740804ef4bSEric W. Biederman 1975bac0abd6SPavel Emelyanov static inline 1976bac0abd6SPavel Emelyanov int same_thread_group(struct task_struct *p1, struct task_struct *p2) 1977bac0abd6SPavel Emelyanov { 1978bac0abd6SPavel Emelyanov return p1->tgid == p2->tgid; 1979bac0abd6SPavel Emelyanov } 1980bac0abd6SPavel Emelyanov 198136c8b586SIngo Molnar static inline struct task_struct *next_thread(const struct task_struct *p) 198247e65328SOleg Nesterov { 198347e65328SOleg Nesterov return list_entry(rcu_dereference(p->thread_group.next), 198436c8b586SIngo Molnar struct task_struct, thread_group); 198547e65328SOleg Nesterov } 198647e65328SOleg Nesterov 1987e868171aSAlexey Dobriyan static inline int thread_group_empty(struct task_struct *p) 19881da177e4SLinus Torvalds { 198947e65328SOleg Nesterov return list_empty(&p->thread_group); 19901da177e4SLinus Torvalds } 19911da177e4SLinus Torvalds 19921da177e4SLinus Torvalds #define delay_group_leader(p) \ 19931da177e4SLinus Torvalds (thread_group_leader(p) && !thread_group_empty(p)) 19941da177e4SLinus Torvalds 19951da177e4SLinus Torvalds /* 1996260ea101SEric W. Biederman * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring 199722e2c507SJens Axboe * subscriptions and synchronises with wait4(). Also used in procfs. Also 1998ddbcc7e8SPaul Menage * pins the final release of task.io_context. Also protects ->cpuset and 1999ddbcc7e8SPaul Menage * ->cgroup.subsys[]. 20001da177e4SLinus Torvalds * 20011da177e4SLinus Torvalds * Nests both inside and outside of read_lock(&tasklist_lock). 20021da177e4SLinus Torvalds * It must not be nested with write_lock_irq(&tasklist_lock), 20031da177e4SLinus Torvalds * neither inside nor outside. 20041da177e4SLinus Torvalds */ 20051da177e4SLinus Torvalds static inline void task_lock(struct task_struct *p) 20061da177e4SLinus Torvalds { 20071da177e4SLinus Torvalds spin_lock(&p->alloc_lock); 20081da177e4SLinus Torvalds } 20091da177e4SLinus Torvalds 20101da177e4SLinus Torvalds static inline void task_unlock(struct task_struct *p) 20111da177e4SLinus Torvalds { 20121da177e4SLinus Torvalds spin_unlock(&p->alloc_lock); 20131da177e4SLinus Torvalds } 20141da177e4SLinus Torvalds 2015f63ee72eSOleg Nesterov extern struct sighand_struct *lock_task_sighand(struct task_struct *tsk, 2016f63ee72eSOleg Nesterov unsigned long *flags); 2017f63ee72eSOleg Nesterov 2018f63ee72eSOleg Nesterov static inline void unlock_task_sighand(struct task_struct *tsk, 2019f63ee72eSOleg Nesterov unsigned long *flags) 2020f63ee72eSOleg Nesterov { 2021f63ee72eSOleg Nesterov spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); 2022f63ee72eSOleg Nesterov } 2023f63ee72eSOleg Nesterov 2024f037360fSAl Viro #ifndef __HAVE_THREAD_FUNCTIONS 2025f037360fSAl Viro 2026f7e4217bSRoman Zippel #define task_thread_info(task) ((struct thread_info *)(task)->stack) 2027f7e4217bSRoman Zippel #define task_stack_page(task) ((task)->stack) 2028a1261f54SAl Viro 202910ebffdeSAl Viro static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) 203010ebffdeSAl Viro { 203110ebffdeSAl Viro *task_thread_info(p) = *task_thread_info(org); 203210ebffdeSAl Viro task_thread_info(p)->task = p; 203310ebffdeSAl Viro } 203410ebffdeSAl Viro 203510ebffdeSAl Viro static inline unsigned long *end_of_stack(struct task_struct *p) 203610ebffdeSAl Viro { 2037f7e4217bSRoman Zippel return (unsigned long *)(task_thread_info(p) + 1); 203810ebffdeSAl Viro } 203910ebffdeSAl Viro 2040f037360fSAl Viro #endif 2041f037360fSAl Viro 20428b05c7e6SFUJITA Tomonori static inline int object_is_on_stack(void *obj) 20438b05c7e6SFUJITA Tomonori { 20448b05c7e6SFUJITA Tomonori void *stack = task_stack_page(current); 20458b05c7e6SFUJITA Tomonori 20468b05c7e6SFUJITA Tomonori return (obj >= stack) && (obj < (stack + THREAD_SIZE)); 20478b05c7e6SFUJITA Tomonori } 20488b05c7e6SFUJITA Tomonori 20498c9843e5SBenjamin Herrenschmidt extern void thread_info_cache_init(void); 20508c9843e5SBenjamin Herrenschmidt 20511da177e4SLinus Torvalds /* set thread flags in other task's structures 20521da177e4SLinus Torvalds * - see asm/thread_info.h for TIF_xxxx flags available 20531da177e4SLinus Torvalds */ 20541da177e4SLinus Torvalds static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) 20551da177e4SLinus Torvalds { 2056a1261f54SAl Viro set_ti_thread_flag(task_thread_info(tsk), flag); 20571da177e4SLinus Torvalds } 20581da177e4SLinus Torvalds 20591da177e4SLinus Torvalds static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) 20601da177e4SLinus Torvalds { 2061a1261f54SAl Viro clear_ti_thread_flag(task_thread_info(tsk), flag); 20621da177e4SLinus Torvalds } 20631da177e4SLinus Torvalds 20641da177e4SLinus Torvalds static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) 20651da177e4SLinus Torvalds { 2066a1261f54SAl Viro return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); 20671da177e4SLinus Torvalds } 20681da177e4SLinus Torvalds 20691da177e4SLinus Torvalds static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) 20701da177e4SLinus Torvalds { 2071a1261f54SAl Viro return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); 20721da177e4SLinus Torvalds } 20731da177e4SLinus Torvalds 20741da177e4SLinus Torvalds static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) 20751da177e4SLinus Torvalds { 2076a1261f54SAl Viro return test_ti_thread_flag(task_thread_info(tsk), flag); 20771da177e4SLinus Torvalds } 20781da177e4SLinus Torvalds 20791da177e4SLinus Torvalds static inline void set_tsk_need_resched(struct task_struct *tsk) 20801da177e4SLinus Torvalds { 20811da177e4SLinus Torvalds set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 20821da177e4SLinus Torvalds } 20831da177e4SLinus Torvalds 20841da177e4SLinus Torvalds static inline void clear_tsk_need_resched(struct task_struct *tsk) 20851da177e4SLinus Torvalds { 20861da177e4SLinus Torvalds clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); 20871da177e4SLinus Torvalds } 20881da177e4SLinus Torvalds 20898ae121acSGregory Haskins static inline int test_tsk_need_resched(struct task_struct *tsk) 20908ae121acSGregory Haskins { 20918ae121acSGregory Haskins return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); 20928ae121acSGregory Haskins } 20938ae121acSGregory Haskins 20941da177e4SLinus Torvalds static inline int signal_pending(struct task_struct *p) 20951da177e4SLinus Torvalds { 20961da177e4SLinus Torvalds return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); 20971da177e4SLinus Torvalds } 20981da177e4SLinus Torvalds 2099b3c97528SHarvey Harrison extern int __fatal_signal_pending(struct task_struct *p); 2100f776d12dSMatthew Wilcox 2101f776d12dSMatthew Wilcox static inline int fatal_signal_pending(struct task_struct *p) 2102f776d12dSMatthew Wilcox { 2103f776d12dSMatthew Wilcox return signal_pending(p) && __fatal_signal_pending(p); 2104f776d12dSMatthew Wilcox } 2105f776d12dSMatthew Wilcox 210616882c1eSOleg Nesterov static inline int signal_pending_state(long state, struct task_struct *p) 210716882c1eSOleg Nesterov { 210816882c1eSOleg Nesterov if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) 210916882c1eSOleg Nesterov return 0; 211016882c1eSOleg Nesterov if (!signal_pending(p)) 211116882c1eSOleg Nesterov return 0; 211216882c1eSOleg Nesterov 211316882c1eSOleg Nesterov return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); 211416882c1eSOleg Nesterov } 211516882c1eSOleg Nesterov 21161da177e4SLinus Torvalds static inline int need_resched(void) 21171da177e4SLinus Torvalds { 21189404ef02SLinus Torvalds return unlikely(test_thread_flag(TIF_NEED_RESCHED)); 21191da177e4SLinus Torvalds } 21201da177e4SLinus Torvalds 21211da177e4SLinus Torvalds /* 21221da177e4SLinus Torvalds * cond_resched() and cond_resched_lock(): latency reduction via 21231da177e4SLinus Torvalds * explicit rescheduling in places that are safe. The return 21241da177e4SLinus Torvalds * value indicates whether a reschedule was done in fact. 21251da177e4SLinus Torvalds * cond_resched_lock() will drop the spinlock before scheduling, 21261da177e4SLinus Torvalds * cond_resched_softirq() will enable bhs before scheduling. 21271da177e4SLinus Torvalds */ 2128c3921ab7SLinus Torvalds extern int _cond_resched(void); 2129c714a534SLinus Torvalds #ifdef CONFIG_PREEMPT_BKL 213002b67cc3SHerbert Xu static inline int cond_resched(void) 213102b67cc3SHerbert Xu { 213202b67cc3SHerbert Xu return 0; 213302b67cc3SHerbert Xu } 213402b67cc3SHerbert Xu #else 213502b67cc3SHerbert Xu static inline int cond_resched(void) 213602b67cc3SHerbert Xu { 213702b67cc3SHerbert Xu return _cond_resched(); 213802b67cc3SHerbert Xu } 213902b67cc3SHerbert Xu #endif 21401da177e4SLinus Torvalds extern int cond_resched_lock(spinlock_t * lock); 21411da177e4SLinus Torvalds extern int cond_resched_softirq(void); 2142c3921ab7SLinus Torvalds static inline int cond_resched_bkl(void) 2143c3921ab7SLinus Torvalds { 2144c3921ab7SLinus Torvalds return _cond_resched(); 2145c3921ab7SLinus Torvalds } 21461da177e4SLinus Torvalds 21471da177e4SLinus Torvalds /* 21481da177e4SLinus Torvalds * Does a critical section need to be broken due to another 214995c354feSNick Piggin * task waiting?: (technically does not depend on CONFIG_PREEMPT, 215095c354feSNick Piggin * but a general need for low latency) 21511da177e4SLinus Torvalds */ 215295c354feSNick Piggin static inline int spin_needbreak(spinlock_t *lock) 21531da177e4SLinus Torvalds { 215495c354feSNick Piggin #ifdef CONFIG_PREEMPT 215595c354feSNick Piggin return spin_is_contended(lock); 215695c354feSNick Piggin #else 21571da177e4SLinus Torvalds return 0; 215895c354feSNick Piggin #endif 21591da177e4SLinus Torvalds } 21601da177e4SLinus Torvalds 21617bb44adeSRoland McGrath /* 2162f06febc9SFrank Mayhar * Thread group CPU time accounting. 2163f06febc9SFrank Mayhar */ 2164f06febc9SFrank Mayhar 2165bb34d92fSFrank Mayhar extern int thread_group_cputime_alloc(struct task_struct *); 2166bb34d92fSFrank Mayhar extern void thread_group_cputime(struct task_struct *, struct task_cputime *); 2167f06febc9SFrank Mayhar 2168f06febc9SFrank Mayhar static inline void thread_group_cputime_init(struct signal_struct *sig) 2169f06febc9SFrank Mayhar { 2170f06febc9SFrank Mayhar sig->cputime.totals = NULL; 2171f06febc9SFrank Mayhar } 2172f06febc9SFrank Mayhar 2173bb34d92fSFrank Mayhar static inline int thread_group_cputime_clone_thread(struct task_struct *curr) 2174f06febc9SFrank Mayhar { 2175f06febc9SFrank Mayhar if (curr->signal->cputime.totals) 2176f06febc9SFrank Mayhar return 0; 2177bb34d92fSFrank Mayhar return thread_group_cputime_alloc(curr); 2178f06febc9SFrank Mayhar } 2179f06febc9SFrank Mayhar 2180f06febc9SFrank Mayhar static inline void thread_group_cputime_free(struct signal_struct *sig) 2181f06febc9SFrank Mayhar { 2182f06febc9SFrank Mayhar free_percpu(sig->cputime.totals); 2183f06febc9SFrank Mayhar } 2184f06febc9SFrank Mayhar 2185f06febc9SFrank Mayhar /* 21867bb44adeSRoland McGrath * Reevaluate whether the task has signals pending delivery. 21877bb44adeSRoland McGrath * Wake the task if so. 21887bb44adeSRoland McGrath * This is required every time the blocked sigset_t changes. 21897bb44adeSRoland McGrath * callers must hold sighand->siglock. 21907bb44adeSRoland McGrath */ 21917bb44adeSRoland McGrath extern void recalc_sigpending_and_wake(struct task_struct *t); 21921da177e4SLinus Torvalds extern void recalc_sigpending(void); 21931da177e4SLinus Torvalds 21941da177e4SLinus Torvalds extern void signal_wake_up(struct task_struct *t, int resume_stopped); 21951da177e4SLinus Torvalds 21961da177e4SLinus Torvalds /* 21971da177e4SLinus Torvalds * Wrappers for p->thread_info->cpu access. No-op on UP. 21981da177e4SLinus Torvalds */ 21991da177e4SLinus Torvalds #ifdef CONFIG_SMP 22001da177e4SLinus Torvalds 22011da177e4SLinus Torvalds static inline unsigned int task_cpu(const struct task_struct *p) 22021da177e4SLinus Torvalds { 2203a1261f54SAl Viro return task_thread_info(p)->cpu; 22041da177e4SLinus Torvalds } 22051da177e4SLinus Torvalds 2206c65cc870SIngo Molnar extern void set_task_cpu(struct task_struct *p, unsigned int cpu); 22071da177e4SLinus Torvalds 22081da177e4SLinus Torvalds #else 22091da177e4SLinus Torvalds 22101da177e4SLinus Torvalds static inline unsigned int task_cpu(const struct task_struct *p) 22111da177e4SLinus Torvalds { 22121da177e4SLinus Torvalds return 0; 22131da177e4SLinus Torvalds } 22141da177e4SLinus Torvalds 22151da177e4SLinus Torvalds static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) 22161da177e4SLinus Torvalds { 22171da177e4SLinus Torvalds } 22181da177e4SLinus Torvalds 22191da177e4SLinus Torvalds #endif /* CONFIG_SMP */ 22201da177e4SLinus Torvalds 22211da177e4SLinus Torvalds extern void arch_pick_mmap_layout(struct mm_struct *mm); 22221da177e4SLinus Torvalds 22231a3c3034SIngo Molnar #ifdef CONFIG_TRACING 22241a3c3034SIngo Molnar extern void 22251a3c3034SIngo Molnar __trace_special(void *__tr, void *__data, 22261a3c3034SIngo Molnar unsigned long arg1, unsigned long arg2, unsigned long arg3); 22271a3c3034SIngo Molnar #else 22281a3c3034SIngo Molnar static inline void 22291a3c3034SIngo Molnar __trace_special(void *__tr, void *__data, 22301a3c3034SIngo Molnar unsigned long arg1, unsigned long arg2, unsigned long arg3) 22311a3c3034SIngo Molnar { 22321a3c3034SIngo Molnar } 22331a3c3034SIngo Molnar #endif 22341a3c3034SIngo Molnar 2235b53e921bSMike Travis extern long sched_setaffinity(pid_t pid, const cpumask_t *new_mask); 22361da177e4SLinus Torvalds extern long sched_getaffinity(pid_t pid, cpumask_t *mask); 22371da177e4SLinus Torvalds 22385c45bf27SSiddha, Suresh B extern int sched_mc_power_savings, sched_smt_power_savings; 22395c45bf27SSiddha, Suresh B 22401da177e4SLinus Torvalds extern void normalize_rt_tasks(void); 22411da177e4SLinus Torvalds 2242052f1dc7SPeter Zijlstra #ifdef CONFIG_GROUP_SCHED 22439b5b7751SSrivatsa Vaddagiri 22444cf86d77SIngo Molnar extern struct task_group init_task_group; 2245eff766a6SPeter Zijlstra #ifdef CONFIG_USER_SCHED 2246eff766a6SPeter Zijlstra extern struct task_group root_task_group; 2247eff766a6SPeter Zijlstra #endif 22489b5b7751SSrivatsa Vaddagiri 2249ec7dc8acSDhaval Giani extern struct task_group *sched_create_group(struct task_group *parent); 22504cf86d77SIngo Molnar extern void sched_destroy_group(struct task_group *tg); 22519b5b7751SSrivatsa Vaddagiri extern void sched_move_task(struct task_struct *tsk); 2252052f1dc7SPeter Zijlstra #ifdef CONFIG_FAIR_GROUP_SCHED 22534cf86d77SIngo Molnar extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); 22545cb350baSDhaval Giani extern unsigned long sched_group_shares(struct task_group *tg); 2255052f1dc7SPeter Zijlstra #endif 2256052f1dc7SPeter Zijlstra #ifdef CONFIG_RT_GROUP_SCHED 22579f0c1e56SPeter Zijlstra extern int sched_group_set_rt_runtime(struct task_group *tg, 22589f0c1e56SPeter Zijlstra long rt_runtime_us); 22599f0c1e56SPeter Zijlstra extern long sched_group_rt_runtime(struct task_group *tg); 2260d0b27fa7SPeter Zijlstra extern int sched_group_set_rt_period(struct task_group *tg, 2261d0b27fa7SPeter Zijlstra long rt_period_us); 2262d0b27fa7SPeter Zijlstra extern long sched_group_rt_period(struct task_group *tg); 2263052f1dc7SPeter Zijlstra #endif 22649b5b7751SSrivatsa Vaddagiri #endif 22659b5b7751SSrivatsa Vaddagiri 22664b98d11bSAlexey Dobriyan #ifdef CONFIG_TASK_XACCT 22674b98d11bSAlexey Dobriyan static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 22684b98d11bSAlexey Dobriyan { 2269940389b8SAndrea Righi tsk->ioac.rchar += amt; 22704b98d11bSAlexey Dobriyan } 22714b98d11bSAlexey Dobriyan 22724b98d11bSAlexey Dobriyan static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 22734b98d11bSAlexey Dobriyan { 2274940389b8SAndrea Righi tsk->ioac.wchar += amt; 22754b98d11bSAlexey Dobriyan } 22764b98d11bSAlexey Dobriyan 22774b98d11bSAlexey Dobriyan static inline void inc_syscr(struct task_struct *tsk) 22784b98d11bSAlexey Dobriyan { 2279940389b8SAndrea Righi tsk->ioac.syscr++; 22804b98d11bSAlexey Dobriyan } 22814b98d11bSAlexey Dobriyan 22824b98d11bSAlexey Dobriyan static inline void inc_syscw(struct task_struct *tsk) 22834b98d11bSAlexey Dobriyan { 2284940389b8SAndrea Righi tsk->ioac.syscw++; 22854b98d11bSAlexey Dobriyan } 22864b98d11bSAlexey Dobriyan #else 22874b98d11bSAlexey Dobriyan static inline void add_rchar(struct task_struct *tsk, ssize_t amt) 22884b98d11bSAlexey Dobriyan { 22894b98d11bSAlexey Dobriyan } 22904b98d11bSAlexey Dobriyan 22914b98d11bSAlexey Dobriyan static inline void add_wchar(struct task_struct *tsk, ssize_t amt) 22924b98d11bSAlexey Dobriyan { 22934b98d11bSAlexey Dobriyan } 22944b98d11bSAlexey Dobriyan 22954b98d11bSAlexey Dobriyan static inline void inc_syscr(struct task_struct *tsk) 22964b98d11bSAlexey Dobriyan { 22974b98d11bSAlexey Dobriyan } 22984b98d11bSAlexey Dobriyan 22994b98d11bSAlexey Dobriyan static inline void inc_syscw(struct task_struct *tsk) 23004b98d11bSAlexey Dobriyan { 23014b98d11bSAlexey Dobriyan } 23024b98d11bSAlexey Dobriyan #endif 23034b98d11bSAlexey Dobriyan 230482455257SDave Hansen #ifndef TASK_SIZE_OF 230582455257SDave Hansen #define TASK_SIZE_OF(tsk) TASK_SIZE 230682455257SDave Hansen #endif 230782455257SDave Hansen 2308cf475ad2SBalbir Singh #ifdef CONFIG_MM_OWNER 2309cf475ad2SBalbir Singh extern void mm_update_next_owner(struct mm_struct *mm); 2310cf475ad2SBalbir Singh extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); 2311cf475ad2SBalbir Singh #else 2312cf475ad2SBalbir Singh static inline void mm_update_next_owner(struct mm_struct *mm) 2313cf475ad2SBalbir Singh { 2314cf475ad2SBalbir Singh } 2315cf475ad2SBalbir Singh 2316cf475ad2SBalbir Singh static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) 2317cf475ad2SBalbir Singh { 2318cf475ad2SBalbir Singh } 2319cf475ad2SBalbir Singh #endif /* CONFIG_MM_OWNER */ 2320cf475ad2SBalbir Singh 23217c731e0aSSteven Rostedt #define TASK_STATE_TO_CHAR_STR "RSDTtZX" 23227c731e0aSSteven Rostedt 23231da177e4SLinus Torvalds #endif /* __KERNEL__ */ 23241da177e4SLinus Torvalds 23251da177e4SLinus Torvalds #endif 2326