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#include <linux/mm.h>
  25
  26/*
  27 * fill in basic accounting fields
  28 */
  29void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
  30{
  31        const struct cred *tcred;
  32        struct timespec uptime, ts;
  33        u64 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 (should never be negative) */
  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 = get_seconds() - 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_pid    = tsk->pid;
  59        rcu_read_lock();
  60        tcred = __task_cred(tsk);
  61        stats->ac_uid    = tcred->uid;
  62        stats->ac_gid    = tcred->gid;
  63        stats->ac_ppid   = pid_alive(tsk) ?
  64                                rcu_dereference(tsk->real_parent)->tgid : 0;
  65        rcu_read_unlock();
  66        stats->ac_utime = cputime_to_usecs(tsk->utime);
  67        stats->ac_stime = cputime_to_usecs(tsk->stime);
  68        stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled);
  69        stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled);
  70        stats->ac_minflt = tsk->min_flt;
  71        stats->ac_majflt = tsk->maj_flt;
  72
  73        strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
  74}
  75
  76
  77#ifdef CONFIG_TASK_XACCT
  78
  79#define KB 1024
  80#define MB (1024*KB)
  81/*
  82 * fill in extended accounting fields
  83 */
  84void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
  85{
  86        struct mm_struct *mm;
  87
  88        /* convert pages-usec to Mbyte-usec */
  89        stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
  90        stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
  91        mm = get_task_mm(p);
  92        if (mm) {
  93                /* adjust to KB unit */
  94                stats->hiwater_rss   = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
  95                stats->hiwater_vm    = get_mm_hiwater_vm(mm)  * PAGE_SIZE / KB;
  96                mmput(mm);
  97        }
  98        stats->read_char        = p->ioac.rchar;
  99        stats->write_char       = p->ioac.wchar;
 100        stats->read_syscalls    = p->ioac.syscr;
 101        stats->write_syscalls   = p->ioac.syscw;
 102#ifdef CONFIG_TASK_IO_ACCOUNTING
 103        stats->read_bytes       = p->ioac.read_bytes;
 104        stats->write_bytes      = p->ioac.write_bytes;
 105        stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
 106#else
 107        stats->read_bytes       = 0;
 108        stats->write_bytes      = 0;
 109        stats->cancelled_write_bytes = 0;
 110#endif
 111}
 112#undef KB
 113#undef MB
 114
 115/**
 116 * acct_update_integrals - update mm integral fields in task_struct
 117 * @tsk: task_struct for accounting
 118 */
 119void acct_update_integrals(struct task_struct *tsk)
 120{
 121        if (likely(tsk->mm)) {
 122                cputime_t time, dtime;
 123                struct timeval value;
 124                unsigned long flags;
 125                u64 delta;
 126
 127                local_irq_save(flags);
 128                time = tsk->stime + tsk->utime;
 129                dtime = cputime_sub(time, tsk->acct_timexpd);
 130                jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
 131                delta = value.tv_sec;
 132                delta = delta * USEC_PER_SEC + value.tv_usec;
 133
 134                if (delta == 0)
 135                        goto out;
 136                tsk->acct_timexpd = time;
 137                tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
 138                tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
 139        out:
 140                local_irq_restore(flags);
 141        }
 142}
 143
 144/**
 145 * acct_clear_integrals - clear the mm integral fields in task_struct
 146 * @tsk: task_struct whose accounting fields are cleared
 147 */
 148void acct_clear_integrals(struct task_struct *tsk)
 149{
 150        tsk->acct_timexpd = 0;
 151        tsk->acct_rss_mem1 = 0;
 152        tsk->acct_vm_mem1 = 0;
 153}
 154#endif
 155