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accounting: account for user time when updating memory integrals

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Adapt acct_update_integrals() to include user time when calculating the time
difference.  The units of acct_rss_mem1 and acct_vm_mem1 are also changed from
pages-jiffies to pages-usecs to avoid calling jiffies_to_usecs() in
xacct_add_tsk() which might overflow.

Signed-off-by: Jonathan Lim <jlim@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jonathan Lim 2008-07-25 01:48:40 -07:00 committed by Linus Torvalds
parent 7394f0f6c0
commit 49b5cf3472
3 changed files with 17 additions and 8 deletions
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2
include/linux/sched.h
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@ -1257,7 +1257,7 @@ struct task_struct {
#if defined(CONFIG_TASK_XACCT)
u64 acct_rss_mem1; /* accumulated rss usage */
u64 acct_vm_mem1; /* accumulated virtual memory usage */
cputime_t acct_stimexpd;/* stime since last update */
cputime_t acct_timexpd; /* stime + utime since last update */
#endif
#ifdef CONFIG_CPUSETS
nodemask_t mems_allowed;

2
kernel/sched.c
View file

@ -4046,6 +4046,8 @@ void account_user_time(struct task_struct *p, cputime_t cputime)
cpustat->nice = cputime64_add(cpustat->nice, tmp);
else
cpustat->user = cputime64_add(cpustat->user, tmp);
/* Account for user time used */
acct_update_integrals(p);
}
/*

21
kernel/tsacct.c
View file

@ -84,9 +84,9 @@ 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;
/* 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 */
@ -118,12 +118,19 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
void acct_update_integrals(struct task_struct *tsk)
{
if (likely(tsk->mm)) {
long delta = cputime_to_jiffies(
cputime_sub(tsk->stime, tsk->acct_stimexpd));
cputime_t time, dtime;
struct timeval value;
u64 delta;
time = tsk->stime + tsk->utime;
dtime = cputime_sub(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)
return;
tsk->acct_stimexpd = tsk->stime;
tsk->acct_timexpd = time;
tsk->acct_rss_mem1 += delta * get_mm_rss(tsk->mm);
tsk->acct_vm_mem1 += delta * tsk->mm->total_vm;
}
@ -135,7 +142,7 @@ void acct_update_integrals(struct task_struct *tsk)
*/
void acct_clear_integrals(struct task_struct *tsk)
{
tsk->acct_stimexpd = 0;
tsk->acct_timexpd = 0;
tsk->acct_rss_mem1 = 0;
tsk->acct_vm_mem1 = 0;
}