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#include <linux/mm.h>
  25
  26/*
  27 * fill in basic accounting fields
  28 */
  29void bacct_add_tsk(struct user_namespace *user_ns,
  30                   struct pid_namespace *pid_ns,
  31                   struct taskstats *stats, struct task_struct *tsk)
  32{
  33        const struct cred *tcred;
  34        struct timespec uptime, ts;
  35        u64 ac_etime;
  36
  37        BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
  38
  39        /* calculate task elapsed time in timespec */
  40        do_posix_clock_monotonic_gettime(&uptime);
  41        ts = timespec_sub(uptime, tsk->start_time);
  42        /* rebase elapsed time to usec (should never be negative) */
  43        ac_etime = timespec_to_ns(&ts);
  44        do_div(ac_etime, NSEC_PER_USEC);
  45        stats->ac_etime = ac_etime;
  46        stats->ac_btime = get_seconds() - ts.tv_sec;
  47        if (thread_group_leader(tsk)) {
  48                stats->ac_exitcode = tsk->exit_code;
  49                if (tsk->flags & PF_FORKNOEXEC)
  50                        stats->ac_flag |= AFORK;
  51        }
  52        if (tsk->flags & PF_SUPERPRIV)
  53                stats->ac_flag |= ASU;
  54        if (tsk->flags & PF_DUMPCORE)
  55                stats->ac_flag |= ACORE;
  56        if (tsk->flags & PF_SIGNALED)
  57                stats->ac_flag |= AXSIG;
  58        stats->ac_nice   = task_nice(tsk);
  59        stats->ac_sched  = tsk->policy;
  60        stats->ac_pid    = task_pid_nr_ns(tsk, pid_ns);
  61        rcu_read_lock();
  62        tcred = __task_cred(tsk);
  63        stats->ac_uid    = from_kuid_munged(user_ns, tcred->uid);
  64        stats->ac_gid    = from_kgid_munged(user_ns, tcred->gid);
  65        stats->ac_ppid   = pid_alive(tsk) ?
  66                task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
  67        rcu_read_unlock();
  68        stats->ac_utime = cputime_to_usecs(tsk->utime);
  69        stats->ac_stime = cputime_to_usecs(tsk->stime);
  70        stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled);
  71        stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled);
  72        stats->ac_minflt = tsk->min_flt;
  73        stats->ac_majflt = tsk->maj_flt;
  74
  75        strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
  76}
  77
  78
  79#ifdef CONFIG_TASK_XACCT
  80
  81#define KB 1024
  82#define MB (1024*KB)
  83#define KB_MASK (~(KB-1))
  84/*
  85 * fill in extended accounting fields
  86 */
  87void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
  88{
  89        struct mm_struct *mm;
  90
  91        /* convert pages-usec to Mbyte-usec */
  92        stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
  93        stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
  94        mm = get_task_mm(p);
  95        if (mm) {
  96                /* adjust to KB unit */
  97                stats->hiwater_rss   = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
  98                stats->hiwater_vm    = get_mm_hiwater_vm(mm)  * PAGE_SIZE / KB;
  99                mmput(mm);
 100        }
 101        stats->read_char        = p->ioac.rchar & KB_MASK;
 102        stats->write_char       = p->ioac.wchar & KB_MASK;
 103        stats->read_syscalls    = p->ioac.syscr & KB_MASK;
 104        stats->write_syscalls   = p->ioac.syscw & KB_MASK;
 105#ifdef CONFIG_TASK_IO_ACCOUNTING
 106        stats->read_bytes       = p->ioac.read_bytes & KB_MASK;
 107        stats->write_bytes      = p->ioac.write_bytes & KB_MASK;
 108        stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
 109#else
 110        stats->read_bytes       = 0;
 111        stats->write_bytes      = 0;
 112        stats->cancelled_write_bytes = 0;
 113#endif
 114}
 115#undef KB
 116#undef MB
 117
 118/**
 119 * acct_update_integrals - update mm integral fields in task_struct
 120 * @tsk: task_struct for accounting
 121 */
 122void acct_update_integrals(struct task_struct *tsk)
 123{
 124        if (likely(tsk->mm)) {
 125                cputime_t time, dtime;
 126                struct timeval value;
 127                unsigned long flags;
 128                u64 delta;
 129
 130                local_irq_save(flags);
 131                time = tsk->stime + tsk->utime;
 132                dtime = time - tsk->acct_timexpd;
 133                jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
 134                delta = value.tv_sec;
 135                delta = delta * USEC_PER_SEC + value.tv_usec;
 136
 137                if (delta == 0)
 138                        goto out;
 139                tsk->acct_timexpd = time;
 140                tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
 141                tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
 142        out:
 143                local_irq_restore(flags);
 144        }
 145}
 146
 147/**
 148 * acct_clear_integrals - clear the mm integral fields in task_struct
 149 * @tsk: task_struct whose accounting fields are cleared
 150 */
 151void acct_clear_integrals(struct task_struct *tsk)
 152{
 153        tsk->acct_timexpd = 0;
 154        tsk->acct_rss_mem1 = 0;
 155        tsk->acct_vm_mem1 = 0;
 156}
 157#endif
 158
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