From: Chris Mason <chris.mason@oracle.com>
Date: Thu, 15 Dec 2011 14:29:43 +0000 (-0500)
Subject: Btrfs: add a cond_resched() into the worker loop
X-Git-Tag: upstream/snapshot3+hdmi~8510^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8f3b65a3d66bcc086e1eb040b7545e70681f2ed1;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

Btrfs: add a cond_resched() into the worker loop

If we have a constant stream of end_io completions or crc work,
we can hit softlockup messages from the async helper threads.  This
adds a cond_resched() into the loop to avoid them.

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

diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index 7ec1409..203e849 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -331,7 +331,7 @@ again:
 			run_ordered_completions(worker->workers, work);
 
 			check_pending_worker_creates(worker);
-
+			cond_resched();
 		}
 
 		spin_lock_irq(&worker->lock);