FreeBSD/Linux Kernel Cross Reference
sys/kernel/tsacct.c

     /*
      * tsacct.c - System accounting over taskstats interface
      *
      * Copyright (C) Jay Lan,       <jlan@sgi.com>
      *
      *
      * This program is free software; you can redistribute it and/or modify
      * it under the terms of the GNU General Public License as published by
      * the Free Software Foundation; either version 2 of the License, or
     * (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     */
    
    #include <linux/kernel.h>
    #include <linux/sched.h>
    #include <linux/tsacct_kern.h>
    #include <linux/acct.h>
    #include <linux/jiffies.h>
    #include <linux/mm.h>
    
    /*
     * fill in basic accounting fields
     */
    void bacct_add_tsk(struct user_namespace *user_ns,
                       struct pid_namespace *pid_ns,
                       struct taskstats *stats, struct task_struct *tsk)
    {
            const struct cred *tcred;
            struct timespec uptime, ts;
            u64 ac_etime;
    
            BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);
    
            /* calculate task elapsed time in timespec */
            do_posix_clock_monotonic_gettime(&uptime);
            ts = timespec_sub(uptime, tsk->start_time);
            /* rebase elapsed time to usec (should never be negative) */
            ac_etime = timespec_to_ns(&ts);
            do_div(ac_etime, NSEC_PER_USEC);
            stats->ac_etime = ac_etime;
            stats->ac_btime = get_seconds() - ts.tv_sec;
            if (thread_group_leader(tsk)) {
                    stats->ac_exitcode = tsk->exit_code;
                    if (tsk->flags & PF_FORKNOEXEC)
                            stats->ac_flag |= AFORK;
            }
            if (tsk->flags & PF_SUPERPRIV)
                    stats->ac_flag |= ASU;
            if (tsk->flags & PF_DUMPCORE)
                    stats->ac_flag |= ACORE;
            if (tsk->flags & PF_SIGNALED)
                    stats->ac_flag |= AXSIG;
            stats->ac_nice   = task_nice(tsk);
            stats->ac_sched  = tsk->policy;
            stats->ac_pid    = task_pid_nr_ns(tsk, pid_ns);
            rcu_read_lock();
            tcred = __task_cred(tsk);
            stats->ac_uid    = from_kuid_munged(user_ns, tcred->uid);
            stats->ac_gid    = from_kgid_munged(user_ns, tcred->gid);
            stats->ac_ppid   = pid_alive(tsk) ?
                    task_tgid_nr_ns(rcu_dereference(tsk->real_parent), pid_ns) : 0;
            rcu_read_unlock();
            stats->ac_utime = cputime_to_usecs(tsk->utime);
            stats->ac_stime = cputime_to_usecs(tsk->stime);
            stats->ac_utimescaled = cputime_to_usecs(tsk->utimescaled);
            stats->ac_stimescaled = cputime_to_usecs(tsk->stimescaled);
            stats->ac_minflt = tsk->min_flt;
            stats->ac_majflt = tsk->maj_flt;
    
            strncpy(stats->ac_comm, tsk->comm, sizeof(stats->ac_comm));
    }
    
    
    #ifdef CONFIG_TASK_XACCT
    
    #define KB 1024
    #define MB (1024*KB)
    #define KB_MASK (~(KB-1))
    /*
     * fill in extended accounting fields
     */
    void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
    {
            struct mm_struct *mm;
    
            /* convert pages-usec to Mbyte-usec */
            stats->coremem = p->acct_rss_mem1 * PAGE_SIZE / MB;
            stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB;
            mm = get_task_mm(p);
            if (mm) {
                    /* adjust to KB unit */
                    stats->hiwater_rss   = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB;
                    stats->hiwater_vm    = get_mm_hiwater_vm(mm)  * PAGE_SIZE / KB;
                    mmput(mm);
           }
           stats->read_char        = p->ioac.rchar & KB_MASK;
           stats->write_char       = p->ioac.wchar & KB_MASK;
           stats->read_syscalls    = p->ioac.syscr & KB_MASK;
           stats->write_syscalls   = p->ioac.syscw & KB_MASK;
   #ifdef CONFIG_TASK_IO_ACCOUNTING
           stats->read_bytes       = p->ioac.read_bytes & KB_MASK;
           stats->write_bytes      = p->ioac.write_bytes & KB_MASK;
           stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes & KB_MASK;
   #else
           stats->read_bytes       = 0;
           stats->write_bytes      = 0;
           stats->cancelled_write_bytes = 0;
   #endif
   }
   #undef KB
   #undef MB
   
   /**
    * acct_update_integrals - update mm integral fields in task_struct
    * @tsk: task_struct for accounting
    */
   void acct_update_integrals(struct task_struct *tsk)
   {
           if (likely(tsk->mm)) {
                   cputime_t time, dtime;
                   struct timeval value;
                   unsigned long flags;
                   u64 delta;
   
                   local_irq_save(flags);
                   time = tsk->stime + tsk->utime;
                   dtime = time - tsk->acct_timexpd;
                   jiffies_to_timeval(cputime_to_jiffies(dtime), &value);
                   delta = value.tv_sec;
                   delta = delta * USEC_PER_SEC + value.tv_usec;
   
                   if (delta == 0)
                           goto out;
                   tsk->acct_timexpd = time;
                   tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
                   tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
           out:
                   local_irq_restore(flags);
           }
   }
   
   /**
    * acct_clear_integrals - clear the mm integral fields in task_struct
    * @tsk: task_struct whose accounting fields are cleared
    */
   void acct_clear_integrals(struct task_struct *tsk)
   {
           tsk->acct_timexpd = 0;
           tsk->acct_rss_mem1 = 0;
           tsk->acct_vm_mem1 = 0;
   }
   #endif

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