LXR linux/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 */
  28void 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_utimescaled =
  66                cputime_to_msecs(tsk->utimescaled) * USEC_PER_MSEC;
  67        stats->ac_stimescaled =
  68                cputime_to_msecs(tsk->stimescaled) * USEC_PER_MSEC;
  69        stats->ac_minflt = tsk->min_flt;
  70        stats->ac_majflt = tsk->maj_flt;
  71
  72        strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
  73}
  74
  75
  76#ifdef CONFIG_TASK_XACCT
  77
  78#define KB 1024
  79#define MB (1024*KB)
  80/*
  81 * fill in extended accounting fields
  82 */
  83void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
  84{
  85        struct mm_struct *mm;
  86
  87        /* convert pages-jiffies to Mbyte-usec */
  88        stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;
  89        stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;
  90        mm = get_task_mm(p);
  91        if (mm) {
  92                /* adjust to KB unit */
  93                stats->hiwater_rss   = mm->hiwater_rss * PAGE_SIZE / KB;
  94                stats->hiwater_vm    = mm->hiwater_vm * PAGE_SIZE / KB;
  95                mmput(mm);
  96        }
  97        stats->read_char        = p->rchar;
  98        stats->write_char       = p->wchar;
  99        stats->read_syscalls    = p->syscr;
 100        stats->write_syscalls   = p->syscw;
 101#ifdef CONFIG_TASK_IO_ACCOUNTING
 102        stats->read_bytes       = p->ioac.read_bytes;
 103        stats->write_bytes      = p->ioac.write_bytes;
 104        stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
 105#else
 106        stats->read_bytes       = 0;
 107        stats->write_bytes      = 0;
 108        stats->cancelled_write_bytes = 0;
 109#endif
 110}
 111#undef KB
 112#undef MB
 113
 114/**
 115 * acct_update_integrals - update mm integral fields in task_struct
 116 * @tsk: task_struct for accounting
 117 */
 118void acct_update_integrals(struct task_struct *tsk)
 119{
 120        if (likely(tsk->mm)) {
 121                long delta = cputime_to_jiffies(
 122                        cputime_sub(tsk->stime, tsk->acct_stimexpd));
 123
 124                if (delta == 0)
 125                        return;
 126                tsk->acct_stimexpd = tsk->stime;
 127                tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
 128                tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
 129        }
 130}
 131
 132/**
 133 * acct_clear_integrals - clear the mm integral fields in task_struct
 134 * @tsk: task_struct whose accounting fields are cleared
 135 */
 136void acct_clear_integrals(struct task_struct *tsk)
 137{
 138        tsk->acct_stimexpd = 0;
 139        tsk->acct_rss_mem1 = 0;
 140        tsk->acct_vm_mem1 = 0;
 141}
 142#endif
 143