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md: reduce CPU wastage on idle md array with a write-intent bitmap

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Recent patch titled
  Reduce CPU wastage on idle md array with a write-intent bitmap.

would sometimes leave the array with dirty bitmap bits that stay dirty.  A
subsequent write would sort things out so it isn't a big problem, but should
be fixed nonetheless.

We need to make sure that when the bitmap becomes not "allclean", the
daemon_sleep really does get set to a sensible value.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
NeilBrown 2008-03-10 11:43:48 -07:00 committed by Linus Torvalds
parent 52720ae77d
commit 7be3dfec47
1 changed files with 3 additions and 1 deletions
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4
drivers/md/bitmap.c
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@ -1045,7 +1045,8 @@ void bitmap_daemon_work(struct bitmap *bitmap)
if (bitmap == NULL)
return;
if (time_before(jiffies, bitmap->daemon_lastrun + bitmap->daemon_sleep*HZ))
return;
goto done;
bitmap->daemon_lastrun = jiffies;
if (bitmap->allclean) {
bitmap->mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
@ -1142,6 +1143,7 @@ void bitmap_daemon_work(struct bitmap *bitmap)
}
}
done:
if (bitmap->allclean == 0)
bitmap->mddev->thread->timeout = bitmap->daemon_sleep * HZ;
}