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per-task-delay-accounting: update taskstats for memory reclaim delay 

Add members for memory reclaim delay to taskstats, and accumulate them in
__delayacct_add_tsk() .

Signed-off-by: Keika Kobayashi <kobayashi.kk@ncos.nec.co.jp>
Cc: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Keika Kobayashi 2008-07-25 01:48:53 -07:00 committed by Linus Torvalds
parent 873b477177
commit 016ae219b9
3 changed files with 15 additions and 1 deletions
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7
Documentation/accounting/taskstats-struct.txt
View File

@ -26,6 +26,8 @@ There are three different groups of fields in the struct taskstats:
5) Time accounting for SMT machines
6) Extended delay accounting fields for memory reclaim
Future extension should add fields to the end of the taskstats struct, and
should not change the relative position of each field within the struct.
@ -170,4 +172,9 @@ struct taskstats {
__u64 ac_utimescaled; /* utime scaled on frequency etc */
__u64 ac_stimescaled; /* stime scaled on frequency etc */
__u64 cpu_scaled_run_real_total; /* scaled cpu_run_real_total */
6) Extended delay accounting fields for memory reclaim
/* Delay waiting for memory reclaim */
__u64 freepages_count;
__u64 freepages_delay_total;
}

6
include/linux/taskstats.h
View File

@ -31,7 +31,7 @@
*/
#define TASKSTATS_VERSION 6
#define TASKSTATS_VERSION 7
#define TS_COMM_LEN 32 /* should be >= TASK_COMM_LEN
* in linux/sched.h */
@ -157,6 +157,10 @@ struct taskstats {
__u64 ac_utimescaled; /* utime scaled on frequency etc */
__u64 ac_stimescaled; /* stime scaled on frequency etc */
__u64 cpu_scaled_run_real_total; /* scaled cpu_run_real_total */
/* Delay waiting for memory reclaim */
__u64 freepages_count;
__u64 freepages_delay_total;
};

3
kernel/delayacct.c
View File

@ -145,8 +145,11 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
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;
tmp = d->freepages_delay_total + tsk->delays->freepages_delay;
d->freepages_delay_total = (tmp < d->freepages_delay_total) ? 0 : tmp;
d->blkio_count += tsk->delays->blkio_count;
d->swapin_count += tsk->delays->swapin_count;
d->freepages_count += tsk->delays->freepages_count;
spin_unlock_irqrestore(&tsk->delays->lock, flags);
done: