Quelle tsacct.c Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* tsacct.c - System accounting over taskstats interface
*
* Copyright (C) Jay Lan, <jlan@sgi.com>
*/

#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 now_ns, delta;
time64_t btime;

BUILD_BUG_ON(TS_COMM_LEN < TASK_COMM_LEN);

/* calculate task elapsed time in nsec */
now_ns = ktime_get_ns();
/* store whole group time first */
delta = now_ns - tsk->group_leader->start_time;
/* Convert to micro seconds */
do_div(delta, NSEC_PER_USEC);
stats->ac_tgetime = delta;
delta = now_ns - tsk->start_time;
do_div(delta, NSEC_PER_USEC);
stats->ac_etime = delta;
/* Convert to seconds for btime (note y2106 limit) */
btime = ktime_get_real_seconds() - div_u64(delta, USEC_PER_SEC);
stats->ac_btime = clamp_t(time64_t, btime, 0, U32_MAX);
stats->ac_btime64 = btime;

if (tsk->flags & PF_EXITING)
  stats->ac_exitcode = tsk->exit_code;
if (thread_group_leader(tsk) && (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);
stats->ac_tgid   = task_tgid_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();

task_cputime(tsk, &utime, &stime);
stats->ac_utime = div_u64(utime, NSEC_PER_USEC);
stats->ac_stime = div_u64(stime, NSEC_PER_USEC);

task_cputime_scaled(tsk, &utimescaled, &stimescaled);
stats->ac_utimescaled = div_u64(utimescaled, NSEC_PER_USEC);
stats->ac_stimescaled = div_u64(stimescaled, NSEC_PER_USEC);

stats->ac_minflt = tsk->min_flt;
stats->ac_majflt = tsk->maj_flt;

strscpy_pad(stats->ac_comm, tsk->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-nsec/1024 to Mbyte-usec, see __acct_update_integrals */
stats->coremem = p->acct_rss_mem1 * PAGE_SIZE;
do_div(stats->coremem, 1000 * KB);
stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE;
do_div(stats->virtmem, 1000 * KB);
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

static void __acct_update_integrals(struct task_struct *tsk,
        u64 utime, u64 stime)
{
u64 time, delta;

if (!likely(tsk->mm))
  return;

time = stime + utime;
delta = time - tsk->acct_timexpd;

if (delta < TICK_NSEC)
  return;

tsk->acct_timexpd = time;
/*
* Divide by 1024 to avoid overflow, and to avoid division.
* The final unit reported to userspace is Mbyte-usecs,
* the rest of the math is done in xacct_add_tsk.
*/
tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm) >> 10;
tsk->acct_vm_mem1 += delta * READ_ONCE(tsk->mm->total_vm) >> 10;
}

/**
* acct_update_integrals - update mm integral fields in task_struct
* @tsk: task_struct for accounting
*/
void acct_update_integrals(struct task_struct *tsk)
{
u64 utime, stime;
unsigned long flags;

local_irq_save(flags);
task_cputime(tsk, &utime, &stime);
__acct_update_integrals(tsk, utime, stime);
local_irq_restore(flags);
}

/**
* acct_account_cputime - update mm integral after cputime update
* @tsk: task_struct for accounting
*/
void acct_account_cputime(struct task_struct *tsk)
{
__acct_update_integrals(tsk, tsk->utime, tsk->stime);
}

/**
* 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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