linux-ext4 - Re: [PATCH] jbd2: Use WRITE_SYNC in journal checkpoint.

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Message-ID: <20110627164158.GD2729@thunk.org>
Date:	Mon, 27 Jun 2011 12:41:58 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Tao Ma <tm@....ma>
Cc:	linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] jbd2: Use WRITE_SYNC in journal checkpoint.

On Tue, Jun 07, 2011 at 11:49:19AM +0800, Tao Ma wrote:
> From: Tao Ma <boyu.mt@...bao.com>
> 
> In journal checkpoint, we write the buffer and wait for its finish.
> But in cfq, the async queue has a very low priority, and in our test,
> if there are too many sync queues and every queue is filled up with
> requests, the write request will be delayed for quite a long time and
> all the tasks which are waiting for journal space will end with errors like:

Thanks, added to the ext4 patch tree.

					- Ted
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