tsacct.c

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/*
 * tsacct.c - System accounting over taskstats interface
 *
 * Copyright (C) Jay Lan,   <[email protected]>
 *
 *
 * 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

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);
    }
}

void acct_clear_integrals(struct task_struct *tsk)
{
    tsk->acct_timexpd = 0;
    tsk->acct_rss_mem1 = 0;
    tsk->acct_vm_mem1 = 0;
}
#endif