linux/kernel/tsacct.c
<<
>>
Prefs
   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        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 */
  93void 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
 124static 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 */
 154void 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 */
 166void 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 */
 175void 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
 182
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.