linux-kernel - Re: [PATCH 3/3] mlock: avoid dirtying pages and triggering writeback

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Message-ID: <1290032326.2109.1281.camel@laptop>
Date:	Wed, 17 Nov 2010 23:18:46 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	Nick Piggin <npiggin@...nel.dk>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Kosaki Motohiro <kosaki.motohiro@...fujitsu.com>,
	Theodore Tso <tytso@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH 3/3] mlock: avoid dirtying pages and triggering
 writeback

On Wed, 2010-11-17 at 14:05 -0800, Michel Lespinasse wrote:
> 
> Really, my understanding is that not pre-allocating filesystem blocks
> is just fine. This is, after all, what happens with ext3 and it's
> never been reported as a bug (that I know of).
> 
fwiw I'm perfectly fine with it

> If filesystem people's feedback is that they really want mlock() to
> continue pre-allocating blocks, maybe we can just do it using
> fallocate() rather than page_mkwrite() callbacks ? 

Sounds sensible..
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