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  * fill in basic accounting fields
  27  */
  28 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
  29 {
  30         struct timespec uptime, ts;
  31         s64 ac_etime;
  32
  33         BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
  34
  35         /* calculate task elapsed time in timespec */
  36         do_posix_clock_monotonic_gettime(&uptime);
  37         ts = timespec_sub(uptime, tsk->start_time);
  38         /* rebase elapsed time to usec */
  39         ac_etime = timespec_to_ns(&ts);
  40         do_div(ac_etime, NSEC_PER_USEC);
  41         stats->ac_etime = ac_etime;
  42         stats->ac_btime = get_seconds() - ts.tv_sec;
  43         if (thread_group_leader(tsk)) {
  44                 stats->ac_exitcode = tsk->exit_code;
  45                 if (tsk->flags & PF_FORKNOEXEC)
  46                         stats->ac_flag |= AFORK;
  47         }
  48         if (tsk->flags & PF_SUPERPRIV)
  49                 stats->ac_flag |= ASU;
  50         if (tsk->flags & PF_DUMPCORE)
  51                 stats->ac_flag |= ACORE;
  52         if (tsk->flags & PF_SIGNALED)
  53                 stats->ac_flag |= AXSIG;
  54         stats->ac_nice   = task_nice(tsk);
  55         stats->ac_sched  = tsk->policy;
  56         stats->ac_uid    = tsk->uid;
  57         stats->ac_gid    = tsk->gid;
  58         stats->ac_pid    = tsk->pid;
  59         rcu_read_lock();
  60         stats->ac_ppid   = pid_alive(tsk) ?
  61                                 rcu_dereference(tsk->real_parent)->tgid : 0;
  62         rcu_read_unlock();
  63         stats->ac_utime  = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;
  64         stats->ac_stime  = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;
  65         stats->ac_minflt = tsk->min_flt;
  66         stats->ac_majflt = tsk->maj_flt;
  67
  68         strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
  69 }
  70
  71
  72 #ifdef CONFIG_TASK_XACCT
  73
  74 #define KB 1024
  75 #define MB (1024*KB)
  76 /*
  77  * fill in extended accounting fields
  78  */
  79 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
  80 {
  81         struct mm_struct *mm;
  82
  83         /* convert pages-jiffies to Mbyte-usec */
  84         stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;
  85         stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;
  86         mm = get_task_mm(p);
  87         if (mm) {
  88                 /* adjust to KB unit */
  89                 stats->hiwater_rss   = mm->hiwater_rss * PAGE_SIZE / KB;
  90                 stats->hiwater_vm    = mm->hiwater_vm * PAGE_SIZE / KB;
  91                 mmput(mm);
  92         }
  93         stats->read_char        = p->rchar;
  94         stats->write_char       = p->wchar;
  95         stats->read_syscalls    = p->syscr;
  96         stats->write_syscalls   = p->syscw;
  97 #ifdef CONFIG_TASK_IO_ACCOUNTING
  98         stats->read_bytes       = p->ioac.read_bytes;
  99         stats->write_bytes      = p->ioac.write_bytes;
 100         stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
 101 #else
 102         stats->read_bytes       = 0;
 103         stats->write_bytes      = 0;
 104         stats->cancelled_write_bytes = 0;
 105 #endif
 106 }
 107 #undef KB
 108 #undef MB
 109
 110 /**
 111  * acct_update_integrals - update mm integral fields in task_struct
 112  * @tsk: task_struct for accounting
 113  */
 114 void acct_update_integrals(struct task_struct *tsk)
 115 {
 116         if (likely(tsk->mm)) {
 117                 long delta = cputime_to_jiffies(
 118                         cputime_sub(tsk->stime, tsk->acct_stimexpd));
 119
 120                 if (delta == 0)
 121                         return;
 122                 tsk->acct_stimexpd = tsk->stime;
 123                 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
 124                 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
 125         }
 126 }
 127
 128 /**
 129  * acct_clear_integrals - clear the mm integral fields in task_struct
 130  * @tsk: task_struct whose accounting fields are cleared
 131  */
 132 void acct_clear_integrals(struct task_struct *tsk)
 133 {
 134         tsk->acct_stimexpd = 0;
 135         tsk->acct_rss_mem1 = 0;
 136         tsk->acct_vm_mem1 = 0;
 137 }
 138 #endif