linux-kernel - Re: [PATCH 3/4] writeback: pay attention to wbc->nr_to_write in write_cache

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Message-ID: <20100426024527.GD13043@thunk.org>
Date:	Sun, 25 Apr 2010 22:45:27 -0400
From:	tytso@....edu
To:	Dave Chinner <david@...morbit.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, xfs@....sgi.com
Subject: Re: [PATCH 3/4] writeback: pay attention to wbc->nr_to_write in
 write_cache_pages

On Sun, Apr 25, 2010 at 10:43:02PM -0400, tytso@....EDU wrote:
> Have you tested with multiple files that are subject to writeout at
> the same time?  After all, if your I/O allocator does a great job of
> keeping the files contiguous in chunks larger tham 4MB, then if you
> have two or more files that need to be written out, the page allocator
> will round robin between the two files in 4MB chunks, and that might
> not be considered an ideal I/O pattern.

Argh.  Sorry for not proof reading better before hitting the send
key....

s/tham/than/
s/page allocator/writeback code/

						- Ted
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