linux/kernel/tsacct.c
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   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 */
  30void 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 */
  81void 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 */
 107void 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 */
 125void 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
 132