diff options
| author | Shailabh Nagar <nagar@watson.ibm.com> | 2006-07-14 00:24:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-14 21:53:56 -0700 |
| commit | 0ff922452df86f3e9a2c6f705c4588ec62d096a7 (patch) | |
| tree | ac84041bfb63f12d0e2db733c46b2cd2438b4882 /kernel/delayacct.c | |
| parent | ca74e92b4698276b6696f15a801759f50944f387 (diff) | |
[PATCH] per-task-delay-accounting: sync block I/O and swapin delay collection
Unlike earlier iterations of the delay accounting patches, now delays are only
collected for the actual I/O waits rather than try and cover the delays seen
in I/O submission paths.
Account separately for block I/O delays incurred as a result of swapin page
faults whose frequency can be affected by the task/process' rss limit. Hence
swapin delays can act as feedback for rss limit changes independent of I/O
priority changes.
Signed-off-by: Shailabh Nagar <nagar@watson.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 | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/delayacct.c b/kernel/delayacct.c index fbf7f2284952..3546b0800f9f 100644 --- a/kernel/delayacct.c +++ b/kernel/delayacct.c @@ -85,3 +85,22 @@ static void delayacct_end(struct timespec *start, struct timespec *end, spin_unlock(¤t->delays->lock); } +void __delayacct_blkio_start(void) +{ + delayacct_start(¤t->delays->blkio_start); +} + +void __delayacct_blkio_end(void) +{ + if (current->delays->flags & DELAYACCT_PF_SWAPIN) + /* Swapin block I/O */ + delayacct_end(¤t->delays->blkio_start, + ¤t->delays->blkio_end, + ¤t->delays->swapin_delay, + ¤t->delays->swapin_count); + else /* Other block I/O */ + delayacct_end(¤t->delays->blkio_start, + ¤t->delays->blkio_end, + ¤t->delays->blkio_delay, + ¤t->delays->blkio_count); +} |