From: Nikita Danilov <nikita@clusterfs.com>
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Message-ID: <17532.305.602559.660069@gargle.gargle.HOWL>
Date: Tue, 30 May 2006 12:24:17 +0400
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, mason@suse.com, andrea@suse.de, hugh@veritas.com,
       axboe@suse.de
Subject: Re: [rfc][patch] remove racy sync_page?
Newsgroups: gmane.linux.kernel,gmane.linux.kernel.mm
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Nick Piggin writes:
 > Nick Piggin wrote:
 > > Linus Torvalds wrote:
 > > 
 > >>
 > >> Why do you think the IO layer should get larger requests?
 > > 
 > > 
 > > For workloads where plugging helps (ie. lots of smaller, contiguous
 > > requests going into the IO layer), should be pretty good these days
 > > due to multiple readahead and writeback.
 > 
 > Let me try again.
 > 
 > For workloads where plugging helps (ie. lots of smaller, contiguous
 > requests going into the IO layer), the request pattern should be
 > pretty good without plugging these days, due to multiple page
 > readahead and writeback.

Pageout by VM scanner doesn't benefit from those, and it is still quite
important in some workloads (e.g., mmap intensive).

Nikita.
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