linux-ext4 - Re: bio splits unnecessarily due to BH

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Message-ID: <51482381.7010508@sx.jp.nec.com>
Date:	Tue, 19 Mar 2013 17:36:17 +0900
From:	Kazuya Mio <k-mio@...jp.nec.com>
To:	Jan Kara <jack@...e.cz>
CC:	akpm@...ux-foundation.org, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org
Subject: Re: bio splits unnecessarily due to BH_Boundary in ext3 direct I/O

2013/03/07 19:48, Jan Kara wrote:
> Then we properly mark bio should be submitted only if we are mapping last
> part of the mapped extent from the filesystem. Can you give this change a
> try (full patch with changelog attached)?

Sorry for the late response.
After applying your patch, the problem I reported was fixed.

One matter for concern is that submit_bio() is called twice per one buffer_head.
Because submit_page_section() calls dio_bio_submit() before adding
the old page (sdio->cur_page) and the current page to struct dio_submit.
Does it work as required?

Regards,
Kazuya Mio

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