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#define KB_MASK (~(KB-1))
  82/*
  83 * fill in extended accounting fields
  84 */
  85void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
  86{
  87        struct mm_struct *mm;
  88
  89        /* convert pages-usec to Mbyte-usec */
  90        stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
  91        stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
  92        mm = get_task_mm(p);
  93        if (mm) {
  94                /* adjust to KB unit */
  95                stats->hiwater_rss   = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
  96                stats->hiwater_vm    = get_mm_hiwater_vm(mm)  * PAGE_SIZE / KB;
  97                mmput(mm);
  98        }
  99        stats->read_char        = p->ioac.rchar & KB_MASK;
 100        stats->write_char       = p->ioac.wchar & KB_MASK;
 101        stats->read_syscalls    = p->ioac.syscr & KB_MASK;
 102        stats->write_syscalls   = p->ioac.syscw & KB_MASK;
 103#ifdef CONFIG_TASK_IO_ACCOUNTING
 104        stats->read_bytes       = p->ioac.read_bytes & KB_MASK;
 105        stats->write_bytes      = p->ioac.write_bytes & KB_MASK;
 106        stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
 107#else
 108        stats->read_bytes       = 0;
 109        stats->write_bytes      = 0;
 110        stats->cancelled_write_bytes = 0;
 111#endif
 112}
 113#undef KB
 114#undef MB
 115
 116/**
 117 * acct_update_integrals - update mm integral fields in task_struct
 118 * @tsk: task_struct for accounting
 119 */
 120void acct_update_integrals(struct task_struct *tsk)
 121{
 122        if (likely(tsk->mm)) {
 123                cputime_t time, dtime;
 124                struct timeval value;
 125                unsigned long flags;
 126                u64 delta;
 127
 128                local_irq_save(flags);
 129                time = tsk->stime + tsk->utime;
 130                dtime = cputime_sub(time, tsk->acct_timexpd);
 131                jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
 132                delta = value.tv_sec;
 133                delta = delta * USEC_PER_SEC + value.tv_usec;
 134
 135                if (delta == 0)
 136                        goto out;
 137                tsk->acct_timexpd = time;
 138                tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
 139                tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
 140        out:
 141                local_irq_restore(flags);
 142        }
 143}
 144
 145/**
 146 * acct_clear_integrals - clear the mm integral fields in task_struct
 147 * @tsk: task_struct whose accounting fields are cleared
 148 */
 149void acct_clear_integrals(struct task_struct *tsk)
 150{
 151        tsk->acct_timexpd = 0;
 152        tsk->acct_rss_mem1 = 0;
 153        tsk->acct_vm_mem1 = 0;
 154}
 155#endif
 156