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[PATCH] per-task-delay-accounting: delay accounting usage of taskstats interface

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Usage of taskstats interface by delay accounting.

Signed-off-by: Shailabh Nagar <nagar@us.ibm.com>
Signed-off-by: Balbir Singh <balbir@in.ibm.com>
Cc: Jes Sorensen <jes@sgi.com>
Cc: Peter Chubb <peterc@gelato.unsw.edu.au>
Cc: Erich Focht <efocht@ess.nec.de>
Cc: Levent Serinol <lserinol@gmail.com>
Cc: Jay Lan <jlan@engr.sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Shailabh Nagar 2006-07-14 00:24:41 -07:00 • committed by Linus Torvalds
parent c757249af1
commit 6f44993fe1
7 changed files with 144 additions and 7 deletions
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62
kernel/delayacct.c
View file

@ -41,6 +41,10 @@ void delayacct_init(void)
void __delayacct_tsk_init(struct task_struct *tsk)
{
spin_lock_init(&tsk->delays_lock);
/* No need to acquire tsk->delays_lock for allocation here unless
__delayacct_tsk_init called after tsk is attached to tasklist
*/
tsk->delays = kmem_cache_zalloc(delayacct_cache, SLAB_KERNEL);
if (tsk->delays)
spin_lock_init(&tsk->delays->lock);
@ -48,8 +52,11 @@ void __delayacct_tsk_init(struct task_struct *tsk)
void __delayacct_tsk_exit(struct task_struct *tsk)
{
kmem_cache_free(delayacct_cache, tsk->delays);
struct task_delay_info *delays = tsk->delays;
spin_lock(&tsk->delays_lock);
tsk->delays = NULL;
spin_unlock(&tsk->delays_lock);
kmem_cache_free(delayacct_cache, delays);
}
/*
@ -104,3 +111,56 @@ void __delayacct_blkio_end(void)
&current->delays->blkio_delay,
&current->delays->blkio_count);
}
int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
{
s64 tmp;
struct timespec ts;
unsigned long t1,t2,t3;
spin_lock(&tsk->delays_lock);
/* Though tsk->delays accessed later, early exit avoids
* unnecessary returning of other data
*/
if (!tsk->delays)
goto done;
tmp = (s64)d->cpu_run_real_total;
cputime_to_timespec(tsk->utime + tsk->stime, &ts);
tmp += timespec_to_ns(&ts);
d->cpu_run_real_total = (tmp < (s64)d->cpu_run_real_total) ? 0 : tmp;
/*
* No locking available for sched_info (and too expensive to add one)
* Mitigate by taking snapshot of values
*/
t1 = tsk->sched_info.pcnt;
t2 = tsk->sched_info.run_delay;
t3 = tsk->sched_info.cpu_time;
d->cpu_count += t1;
jiffies_to_timespec(t2, &ts);
tmp = (s64)d->cpu_delay_total + timespec_to_ns(&ts);
d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
tmp = (s64)d->cpu_run_virtual_total + (s64)jiffies_to_usecs(t3) * 1000;
d->cpu_run_virtual_total =
(tmp < (s64)d->cpu_run_virtual_total) ? 0 : tmp;
/* zero XXX_total, non-zero XXX_count implies XXX stat overflowed */
spin_lock(&tsk->delays->lock);
tmp = d->blkio_delay_total + tsk->delays->blkio_delay;
d->blkio_delay_total = (tmp < d->blkio_delay_total) ? 0 : tmp;
tmp = d->swapin_delay_total + tsk->delays->swapin_delay;
d->swapin_delay_total = (tmp < d->swapin_delay_total) ? 0 : tmp;
d->blkio_count += tsk->delays->blkio_count;
d->swapin_count += tsk->delays->swapin_count;
spin_unlock(&tsk->delays->lock);
done:
spin_unlock(&tsk->delays_lock);
return 0;
}