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  */
  28 void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)
  29 {
  30         struct timespec uptime, ts;
  31         u64 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 (should never be negative) */
  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  */
  83 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
  84 {
  85         struct mm_struct *mm;
  86
  87         /* convert pages-usec to Mbyte-usec */
  88         stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
  89         stats->virtmem = 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->ioac.rchar;
  98         stats->write_char       = p->ioac.wchar;
  99         stats->read_syscalls    = p->ioac.syscr;
 100         stats->write_syscalls   = p->ioac.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  */
 118 void acct_update_integrals(struct task_struct *tsk)
 119 {
 120         if (likely(tsk->mm)) {
 121                 cputime_t time, dtime;
 122                 struct timeval value;
 123                 u64 delta;
 124
 125                 time = tsk->stime + tsk->utime;
 126                 dtime = cputime_sub(time, tsk->acct_timexpd);
 127                 jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
 128                 delta = value.tv_sec;
 129                 delta = delta * USEC_PER_SEC + value.tv_usec;
 130
 131                 if (delta == 0)
 132                         return;
 133                 tsk->acct_timexpd = time;
 134                 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
 135                 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
 136         }
 137 }
 138
 139 /**
 140  * acct_clear_integrals - clear the mm integral fields in task_struct
 141  * @tsk: task_struct whose accounting fields are cleared
 142  */
 143 void acct_clear_integrals(struct task_struct *tsk)
 144 {
 145         tsk->acct_timexpd = 0;
 146         tsk->acct_rss_mem1 = 0;
 147         tsk->acct_vm_mem1 = 0;
 148 }
 149 #endif