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| author | Shailabh Nagar <nagar@watson.ibm.com> | 2006-07-14 00:24:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-14 21:53:56 -0700 |
| commit | 6f44993fe1d7b2b097f6ac60cd5835c6f5ca0874 (patch) | |
| tree | 0f349f4e6c28cc5d11b7083273543a294c437216 /kernel/delayacct.c | |
| parent | c757249af152c59fd74b85e52e8c090acb33d9c0 (diff) | |
| download | linux-next-6f44993fe1d7b2b097f6ac60cd5835c6f5ca0874.tar.gz | |
[PATCH] per-task-delay-accounting: delay accounting usage of taskstats interface
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>
Diffstat (limited to 'kernel/delayacct.c')
| -rw-r--r-- | kernel/delayacct.c | 62 |
1 files changed, 61 insertions, 1 deletions
diff --git a/kernel/delayacct.c b/kernel/delayacct.c index 3546b0800f9f..1be274a462ca 100644 --- a/kernel/delayacct.c +++ b/kernel/delayacct.c @@ -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) ¤t->delays->blkio_delay, ¤t->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; +} |