Commit d85c8a6f authored Dec 15, 2011 by Chris Mason

Btrfs: unplug every once and a while



The btrfs io submission threads can build up massive plug lists.  This
keeps things more reasonable so we don't hand over huge dumps of IO at
once.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

parent 567a45e9

fs/btrfs/volumes.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -295,6 +295,12 @@ loop_lock:
		btrfs_requeue_work(&device->work);
		goto done;
		}
		/* unplug every 64 requests just for good measure */
		if (batch_run % 64 == 0) {
		blk_finish_plug(&plug);
		blk_start_plug(&plug);
		sync_pending = 0;
		}
		}

		cond_resched();