Commit 7be3dfec authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds

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

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: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 52720ae7
......@@ -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;
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment