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         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  */
  87 void 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  */
 122 void 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  */
 151 void 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