linux-kernel - Re: [RFC][PATCH] Make io

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Message-ID: <20120724225026.GA21691@infradead.org>
Date:	Tue, 24 Jul 2012 18:50:26 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Ankit Jain <jankit@...e.de>, Al Viro <viro@...iv.linux.org.uk>,
	bcrl@...ck.org, linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: Re: [RFC][PATCH] Make io_submit non-blocking

On Wed, Jul 25, 2012 at 08:31:10AM +1000, Dave Chinner wrote:
> FWIW, if you are going to change generic code, you need to present
> results for other filesystems as well (xfs, btrfs are typical), as
> they may not have the same problems as ext4 or react the same way to
> your change. The result might simply be "it is 20% slower"....

And most importantly block devices, as they are one of the biggest
use cases of AIO.  With an almost no-op get_blocks callback I can't
see how this change would provide any gain there.

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