kernel/tsacct.c

   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 }
 100 #undef KB
 101 #undef MB
 102
 103 /**
 104  * acct_update_integrals - update mm integral fields in task_struct
 105  * @tsk: task_struct for accounting
 106  */
 107 void acct_update_integrals(struct task_struct *tsk)
 108 {
 109         if (likely(tsk->mm)) {
 110                 long delta = cputime_to_jiffies(
 111                         cputime_sub(tsk->stime, tsk->acct_stimexpd));
 112
 113                 if (delta == 0)
 114                         return;
 115                 tsk->acct_stimexpd = tsk->stime;
 116                 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
 117                 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
 118         }
 119 }
 120
 121 /**
 122  * acct_clear_integrals - clear the mm integral fields in task_struct
 123  * @tsk: task_struct whose accounting fields are cleared
 124  */
 125 void acct_clear_integrals(struct task_struct *tsk)
 126 {
 127         tsk->acct_stimexpd = 0;
 128         tsk->acct_rss_mem1 = 0;
 129         tsk->acct_vm_mem1 = 0;
 130 }
 131 #endif