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authorShailabh Nagar <nagar@watson.ibm.com>2006-07-14 03:24:37 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-15 00:53:56 -0400
commit0ff922452df86f3e9a2c6f705c4588ec62d096a7 (patch)
treeac84041bfb63f12d0e2db733c46b2cd2438b4882 /include/linux/sched.h
parentca74e92b4698276b6696f15a801759f50944f387 (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 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 7a54e62763c5..2f43f1fb7de7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -566,6 +566,19 @@ struct task_delay_info {
566 * Atomicity of updates to XXX_delay, XXX_count protected by 566 * Atomicity of updates to XXX_delay, XXX_count protected by
567 * single lock above (split into XXX_lock if contention is an issue). 567 * single lock above (split into XXX_lock if contention is an issue).
568 */ 568 */
569
570 /*
571 * XXX_count is incremented on every XXX operation, the delay
572 * associated with the operation is added to XXX_delay.
573 * XXX_delay contains the accumulated delay time in nanoseconds.
574 */
575 struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */
576 u64 blkio_delay; /* wait for sync block io completion */
577 u64 swapin_delay; /* wait for swapin block io completion */
578 u32 blkio_count; /* total count of the number of sync block */
579 /* io operations performed */
580 u32 swapin_count; /* total count of the number of swapin block */
581 /* io operations performed */
569}; 582};
570#endif 583#endif
571 584