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  */
  29 void 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  */
  84 void 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  */
 119 void 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  */
 148 void 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