linux-imx

/*

 * 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/signal.h>

#include <linux/sched/mm.h>

#include <linux/sched/cputime.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;

    u64 utime, stime, utimescaled, stimescaled;

    u64 delta;

​

    BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);

​

    /* calculate task elapsed time in nsec */

    delta = ktime_get_ns() - tsk->start_time;

    /* Convert to micro seconds */

    do_div(delta, NSEC_PER_USEC);

    stats->ac_etime = delta;

    /* Convert to seconds for btime */

    do_div(delta, USEC_PER_SEC);

    stats->ac_btime = get_seconds() - delta;

    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();