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[1/2] dm-log-writes: don't use all the cpu

Message ID 1501252945-20615-1-git-send-email-jbacik@fb.com (mailing list archive)
State Accepted, archived
Delegated to: Mike Snitzer
Headers show

Commit Message

Josef Bacik July 28, 2017, 2:42 p.m. UTC 
From: Josef Bacik <jbacik@fb.com>

The check to see if the logging kthread needs to go to sleep is wrong,
it checks lc->pending_blocks, which will be non-0 if there are any
blocks that are pending, whether they are ready to be logged or not.
What we really want is to go to sleep until it's time to log blocks, so
change this check so we do actually go to sleep in between flushes.

Signed-off-by: Josef Bacik <jbacik@fb.com>
---
 drivers/md/dm-log-writes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/md/dm-log-writes.c b/drivers/md/dm-log-writes.c
index a1da0eb..9aab510 100644
--- a/drivers/md/dm-log-writes.c
+++ b/drivers/md/dm-log-writes.c
@@ -399,7 +399,7 @@  static int log_writes_kthread(void *arg)
 		if (!try_to_freeze()) {
 			set_current_state(TASK_INTERRUPTIBLE);
 			if (!kthread_should_stop() &&
-			    !atomic_read(&lc->pending_blocks))
+			    list_empty(&lc->logging_blocks))
 				schedule();
 			__set_current_state(TASK_RUNNING);
 		}