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/*

 * 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>

/*

 * fill in basic accounting fields

 */

void bacct_add_tsk(struct taskstats *stats, struct task_struct *tsk)

{

        struct timespec uptime, ts;

        s64 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 */

        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_uid    = tsk->uid;

        stats->ac_gid    = tsk->gid;

        stats->ac_pid    = tsk->pid;

        rcu_read_lock();

        stats->ac_ppid   = pid_alive(tsk) ?

                                rcu_dereference(tsk->real_parent)->tgid : 0;

        rcu_read_unlock();

        stats->ac_utime  = cputime_to_msecs(tsk->utime) * USEC_PER_MSEC;

        stats->ac_stime  = cputime_to_msecs(tsk->stime) * USEC_PER_MSEC;

        stats->ac_utimescaled =

                cputime_to_msecs(tsk->utimescaled) * USEC_PER_MSEC;

        stats->ac_stimescaled =

                cputime_to_msecs(tsk->stimescaled) * USEC_PER_MSEC;

        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)

/*

 * fill in extended accounting fields

 */

void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)

{

        struct mm_struct *mm;

        /* convert pages-jiffies to Mbyte-usec */

        stats->coremem = jiffies_to_usecs(p->acct_rss_mem1) * PAGE_SIZE / MB;

        stats->virtmem = jiffies_to_usecs(p->acct_vm_mem1) * PAGE_SIZE / MB;

        mm = get_task_mm(p);

        if (mm) {

                /* adjust to KB unit */

                stats->hiwater_rss   = mm->hiwater_rss * PAGE_SIZE / KB;

                stats->hiwater_vm    = mm->hiwater_vm * PAGE_SIZE / KB;

                mmput(mm);

        }

        stats->read_char        = p->rchar;

        stats->write_char       = p->wchar;

        stats->read_syscalls    = p->syscr;

        stats->write_syscalls   = p->syscw;

#ifdef CONFIG_TASK_IO_ACCOUNTING

        stats->read_bytes       = p->ioac.read_bytes;

        stats->write_bytes      = p->ioac.write_bytes;

        stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;

#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)) {

                long delta = cputime_to_jiffies(

                        cputime_sub(tsk->stime, tsk->acct_stimexpd));

                if (delta == 0)

                        return;

                tsk->acct_stimexpd = tsk->stime;

                tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);

                tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;

        }

}

/**

 * 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_stimexpd = 0;

        tsk->acct_rss_mem1 = 0;

        tsk->acct_vm_mem1 = 0;

}

#endif