1
0
Files
linux/include/linux
Nick Piggin c32ccd87bf [PATCH] inotify: lock avoidance with parent watch status in dentry
Previous inotify work avoidance is good when inotify is completely unused,
but it breaks down if even a single watch is in place anywhere in the
system.  Robin Holt notices that udev is one such culprit - it slows down a
512-thread application on a 512 CPU system from 6 seconds to 22 minutes.

Solve this by adding a flag in the dentry that tells inotify whether or not
its parent inode has a watch on it.  Event queueing to parent will skip
taking locks if this flag is cleared.  Setting and clearing of this flag on
all child dentries versus event delivery: this is no in terms of race
cases, and that was shown to be equivalent to always performing the check.

The essential behaviour is that activity occuring _after_ a watch has been
added and _before_ it has been removed, will generate events.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Robert Love <rml@novell.com>
Cc: John McCutchan <ttb@tentacle.dhs.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-25 08:22:53 -08:00
..
2006-01-08 20:14:02 -08:00
2006-03-21 08:52:18 -08:00
2006-02-22 09:32:46 +00:00
2006-01-18 19:20:24 -08:00
2006-01-13 16:29:56 -08:00
2006-03-20 22:35:41 -08:00
2006-01-13 09:12:21 -08:00
2006-03-24 07:33:20 -08:00
2006-02-03 08:32:00 -08:00
2006-03-23 07:38:09 -08:00
2006-02-11 21:41:11 -08:00
2006-01-08 20:14:02 -08:00
2006-03-20 13:42:59 -08:00
2006-03-22 10:53:19 +01:00
2006-01-08 20:13:49 -08:00
2006-03-24 07:33:25 -08:00
2006-01-18 19:20:29 -08:00
2006-03-25 08:22:51 -08:00
2006-01-14 18:27:09 -08:00
2006-03-20 17:09:11 -08:00
2006-03-20 22:41:23 -08:00
2006-02-01 08:53:13 -08:00
2006-02-08 01:03:52 -05:00
2006-03-20 22:21:10 -08:00
2006-02-10 08:13:12 -08:00
2006-03-20 13:42:59 -08:00
2006-03-23 07:38:12 -08:00
2006-03-23 07:38:12 -08:00
2006-03-22 07:54:06 -08:00
2006-03-22 07:53:57 -08:00
2006-03-22 07:54:02 -08:00
2006-03-25 08:22:52 -08:00
2006-01-18 19:20:29 -08:00
2006-03-23 07:38:13 -08:00
2006-03-23 07:38:14 -08:00
2006-03-23 07:38:14 -08:00
2006-01-14 18:27:12 -08:00
2006-03-20 22:32:28 -08:00
2006-03-08 14:14:01 -08:00
2006-01-15 02:12:54 +01:00
2006-03-25 08:22:51 -08:00
2006-03-22 07:53:55 -08:00
2006-01-10 08:01:42 -08:00
2006-01-08 20:14:02 -08:00
2006-03-20 22:41:23 -08:00
2006-03-23 07:38:12 -08:00
2006-01-14 18:27:13 -08:00
2006-03-20 22:41:23 -08:00
2006-03-24 07:33:31 -08:00
2006-03-23 07:38:07 -08:00
2006-01-08 20:13:45 -08:00
2006-01-12 14:06:38 -08:00
2006-01-18 19:20:17 -08:00
2006-01-10 08:01:59 -08:00
2006-03-23 07:38:11 -08:00
2006-02-01 08:53:13 -08:00
2006-03-23 07:38:14 -08:00
2006-03-21 08:52:18 -08:00
2006-03-23 07:12:57 -05:00
2006-01-10 08:01:57 -08:00