1 /* 2 * tsacct.c - System accounting over taskstats interface 3 * 4 * Copyright (C) Jay Lan, <jlan@sgi.com> 5 * 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/sched.h> 21 #include <linux/tsacct_kern.h> 22 #include <linux/acct.h> 23 #include <linux/jiffies.h> 24 25 26 #define USEC_PER_TICK (USEC_PER_SEC/HZ) 27 /* 28 * fill in basic accounting fields 29 */ 30 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk) 31 { 32 struct timespec uptime, ts; 33 s64 ac_etime; 34 35 BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN); 36 37 /* calculate task elapsed time in timespec */ 38 do_posix_clock_monotonic_gettime(&uptime); 39 ts = timespec_sub(uptime, tsk->start_time); 40 /* rebase elapsed time to usec */ 41 ac_etime = timespec_to_ns(&ts); 42 do_div(ac_etime, NSEC_PER_USEC); 43 stats->ac_etime = ac_etime; 44 stats->ac_btime = xtime.tv_sec - ts.tv_sec; 45 if (thread_group_leader(tsk)) { 46 stats->ac_exitcode = tsk->exit_code; 47 if (tsk->flags & PF_FORKNOEXEC) 48 stats->ac_flag |= AFORK; 49 } 50 if (tsk->flags & PF_SUPERPRIV) 51 stats->ac_flag |= ASU; 52 if (tsk->flags & PF_DUMPCORE) 53 stats->ac_flag |= ACORE; 54 if (tsk->flags & PF_SIGNALED) 55 stats->ac_flag |= AXSIG; 56 stats->ac_nice = task_nice(tsk); 57 stats->ac_sched = tsk->policy; 58 stats->ac_uid = tsk->uid; 59 stats->ac_gid = tsk->gid; 60 stats->ac_pid = tsk->pid; 61 rcu_read_lock(); 62 stats->ac_ppid = pid_alive(tsk) ? 63 rcu_dereference(tsk->real_parent)->tgid : 0; 64 rcu_read_unlock(); 65 stats->ac_utime = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC; 66 stats->ac_stime = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC; 67 stats->ac_minflt = tsk->min_flt; 68 stats->ac_majflt = tsk->maj_flt; 69 70 strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm)); 71 } 72 73 74 #ifdef CONFIG_TASK_XACCT 75 76 #define KB 1024 77 #define MB (1024*KB) 78 /* 79 * fill in extended accounting fields 80 */ 81 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p) 82 { 83 struct mm_struct *mm; 84 85 /* convert pages-jiffies to Mbyte-usec */ 86 stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB; 87 stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB; 88 mm = get_task_mm(p); 89 if (mm) { 90 /* adjust to KB unit */ 91 stats->hiwater_rss = mm->hiwater_rss * PAGE_SIZE / KB; 92 stats->hiwater_vm = mm->hiwater_vm * PAGE_SIZE / KB; 93 mmput(mm); 94 } 95 stats->read_char = p->rchar; 96 stats->write_char = p->wchar; 97 stats->read_syscalls = p->syscr; 98 stats->write_syscalls = p->syscw; 99 #ifdef CONFIG_TASK_IO_ACCOUNTING 100 stats->read_bytes = p->ioac.read_bytes; 101 stats->write_bytes = p->ioac.write_bytes; 102 stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes; 103 #else 104 stats->read_bytes = 0; 105 stats->write_bytes = 0; 106 stats->cancelled_write_bytes = 0; 107 #endif 108 } 109 #undef KB 110 #undef MB 111 112 /** 113 * acct_update_integrals - update mm integral fields in task_struct 114 * @tsk: task_struct for accounting 115 */ 116 void acct_update_integrals(struct task_struct *tsk) 117 { 118 if (likely(tsk->mm)) { 119 long delta = cputime_to_jiffies( 120 cputime_sub(tsk->stime, tsk->acct_stimexpd)); 121 122 if (delta == 0) 123 return; 124 tsk->acct_stimexpd = tsk->stime; 125 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm); 126 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm; 127 } 128 } 129 130 /** 131 * acct_clear_integrals - clear the mm integral fields in task_struct 132 * @tsk: task_struct whose accounting fields are cleared 133 */ 134 void acct_clear_integrals(struct task_struct *tsk) 135 { 136 tsk->acct_stimexpd = 0; 137 tsk->acct_rss_mem1 = 0; 138 tsk->acct_vm_mem1 = 0; 139 } 140 #endif 141