linux-kernel - Re: [PATCH v4] xfs: introduce object readahead to log recovery

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Message-ID: <20130823193325.GV5262@sgi.com>
Date:	Fri, 23 Aug 2013 14:33:25 -0500
From:	Ben Myers <bpm@....com>
To:	zwu.kernel@...il.com
Cc:	xfs@....sgi.com, linux-fsdevel@...r.kernel.org,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] xfs: introduce object readahead to log recovery

On Wed, Aug 14, 2013 at 03:16:03PM +0800, zwu.kernel@...il.com wrote:
> From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
> 
>   It can take a long time to run log recovery operation because it is
> single threaded and is bound by read latency. We can find that it took
> most of the time to wait for the read IO to occur, so if one object
> readahead is introduced to log recovery, it will obviously reduce the
> log recovery time.
> 
> Log recovery time stat:
> 
>           w/o this patch        w/ this patch
> 
> real:        0m15.023s             0m7.802s
> user:        0m0.001s              0m0.001s
> sys:         0m0.246s              0m0.107s
> 
> Signed-off-by: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>

Looks good.

Reviewed-by: Ben Myers <bpm@....com>

Applied.
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