linux-kernel - [PATCH] xfs: remove unecessary AIL push wakeups

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Message-ID: <20120113013028.6802d878@ustc>
Date:	Fri, 13 Jan 2012 01:30:28 +0800
From:	JiSheng Zhang <jszhang3@...l.ustc.edu.cn>
To:	xfs@....sgi.com, elder@...nel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] xfs: remove unecessary AIL push wakeups


In commit 0030807c66("xfs: revert to using a kthread for AIL pushing"),
AIL pushing is revert back to use a kthread. But unfortunately, it
introduced a regression: there are unnecessary AIL push wakeups during
idle, ~20 wakeups/s. This change remove the wakeups by reverting a bit
more: set "tout" value as zero during idle.

Signed-off-by: JiSheng Zhang <jszhang3@...l.ustc.edu.cn>
---
 fs/xfs/xfs_trans_ail.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
index ed9252b..2014387 100644
--- a/fs/xfs/xfs_trans_ail.c
+++ b/fs/xfs/xfs_trans_ail.c
@@ -508,7 +508,7 @@ out_done:
 		ailp->xa_last_pushed_lsn = 0;
 		ailp->xa_log_flush = 0;
 
-		tout = 50;
+		tout = 0;
 	} else if (XFS_LSN_CMP(lsn, target) >= 0) {
 		/*
 		 * We reached the target so wait a bit longer for I/O to
-- 
1.7.8.3


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