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 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         cputime_t utime, stime, utimescaled, stimescaled;
  36         u64 ac_etime;
  37
  38         BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
  39
  40         /* calculate task elapsed time in timespec */
  41         do_posix_clock_monotonic_gettime(&uptime);
  42         ts = timespec_sub(uptime, tsk->start_time);
  43         /* rebase elapsed time to usec (should never be negative) */
  44         ac_etime = timespec_to_ns(&ts);
  45         do_div(ac_etime, NSEC_PER_USEC);
  46         stats->ac_etime = ac_etime;
  47         stats->ac_btime = get_seconds() - ts.tv_sec;
  48         if (thread_group_leader(tsk)) {
  49                 stats->ac_exitcode = tsk->exit_code;
  50                 if (tsk->flags & PF_FORKNOEXEC)
  51                         stats->ac_flag |= AFORK;
  52         }
  53         if (tsk->flags & PF_SUPERPRIV)
  54                 stats->ac_flag |= ASU;
  55         if (tsk->flags & PF_DUMPCORE)
  56                 stats->ac_flag |= ACORE;
  57         if (tsk->flags & PF_SIGNALED)
  58                 stats->ac_flag |= AXSIG;
  59         stats->ac_nice   = task_nice(tsk);
  60         stats->ac_sched  = tsk->policy;
  61         stats->ac_pid    = task_pid_nr_ns(tsk, pid_ns);
  62         rcu_read_lock();
  63         tcred = __task_cred(tsk);
  64         stats->ac_uid    = from_kuid_munged(user_ns, tcred->uid);
  65         stats->ac_gid    = from_kgid_munged(user_ns, tcred->gid);
  66         stats->ac_ppid   = pid_alive(tsk) ?
  67                 task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
  68         rcu_read_unlock();
  69
  70         task_cputime(tsk, &utime, &stime);
  71         stats->ac_utime = cputime_to_usecs(utime);
  72         stats->ac_stime = cputime_to_usecs(stime);
  73
  74         task_cputime_scaled(tsk, &utimescaled, &stimescaled);
  75         stats->ac_utimescaled = cputime_to_usecs(utimescaled);
  76         stats->ac_stimescaled = cputime_to_usecs(stimescaled);
  77
  78         stats->ac_minflt = tsk->min_flt;
  79         stats->ac_majflt = tsk->maj_flt;
  80
  81         strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
  82 }
  83
  84
  85 #ifdef CONFIG_TASK_XACCT
  86
  87 #define KB 1024
  88 #define MB (1024*KB)
  89 #define KB_MASK (~(KB-1))
  90 /*
  91  * fill in extended accounting fields
  92  */
  93 void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
  94 {
  95         struct mm_struct *mm;
  96
  97         /* convert pages-usec to Mbyte-usec */
  98         stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
  99         stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
 100         mm = get_task_mm(p);
 101         if (mm) {
 102                 /* adjust to KB unit */
 103                 stats->hiwater_rss   = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
 104                 stats->hiwater_vm    = get_mm_hiwater_vm(mm)  * PAGE_SIZE / KB;
 105                 mmput(mm);
 106         }
 107         stats->read_char        = p->ioac.rchar & KB_MASK;
 108         stats->write_char       = p->ioac.wchar & KB_MASK;
 109         stats->read_syscalls    = p->ioac.syscr & KB_MASK;
 110         stats->write_syscalls   = p->ioac.syscw & KB_MASK;
 111 #ifdef CONFIG_TASK_IO_ACCOUNTING
 112         stats->read_bytes       = p->ioac.read_bytes & KB_MASK;
 113         stats->write_bytes      = p->ioac.write_bytes & KB_MASK;
 114         stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
 115 #else
 116         stats->read_bytes       = 0;
 117         stats->write_bytes      = 0;
 118         stats->cancelled_write_bytes = 0;
 119 #endif
 120 }
 121 #undef KB
 122 #undef MB
 123
 124 static void __acct_update_integrals(struct task_struct *tsk,
 125                                     cputime_t utime, cputime_t stime)
 126 {
 127         if (likely(tsk->mm)) {
 128                 cputime_t time, dtime;
 129                 struct timeval value;
 130                 unsigned long flags;
 131                 u64 delta;
 132
 133                 local_irq_save(flags);
 134                 time = stime + utime;
 135                 dtime = time - tsk->acct_timexpd;
 136                 jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
 137                 delta = value.tv_sec;
 138                 delta = delta * USEC_PER_SEC + value.tv_usec;
 139
 140                 if (delta == 0)
 141                         goto out;
 142                 tsk->acct_timexpd = time;
 143                 tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
 144                 tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
 145         out:
 146                 local_irq_restore(flags);
 147         }
 148 }
 149
 150 /**
 151  * acct_update_integrals - update mm integral fields in task_struct
 152  * @tsk: task_struct for accounting
 153  */
 154 void acct_update_integrals(struct task_struct *tsk)
 155 {
 156         cputime_t utime, stime;
 157
 158         task_cputime(tsk, &utime, &stime);
 159         __acct_update_integrals(tsk, utime, stime);
 160 }
 161
 162 /**
 163  * acct_account_cputime - update mm integral after cputime update
 164  * @tsk: task_struct for accounting
 165  */
 166 void acct_account_cputime(struct task_struct *tsk)
 167 {
 168         __acct_update_integrals(tsk, tsk->utime, tsk->stime);
 169 }
 170
 171 /**
 172  * acct_clear_integrals - clear the mm integral fields in task_struct
 173  * @tsk: task_struct whose accounting fields are cleared
 174  */
 175 void acct_clear_integrals(struct task_struct *tsk)
 176 {
 177         tsk->acct_timexpd = 0;
 178         tsk->acct_rss_mem1 = 0;
 179         tsk->acct_vm_mem1 = 0;
 180 }
 181 #endif