linux-kernel - Re: [patch 4/5] mm + fs: provide refault distance to page cache instantiations

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Message-ID: <20120501095543.GA2112@cmpxchg.org>
Date:	Tue, 1 May 2012 11:55:43 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-mm@...ck.org, Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 4/5] mm + fs: provide refault distance to page cache
 instantiations

On Tue, May 01, 2012 at 11:30:40AM +0200, Peter Zijlstra wrote:
> On Tue, 2012-05-01 at 10:41 +0200, Johannes Weiner wrote:
> > Every site that does a find_or_create()-style allocation is converted
> > to pass this refault information to the page_cache_alloc() family of
> > functions, which in turn passes it down to the page allocator via
> > current->refault_distance. 
> 
> That is rather icky..

Fair enough, I just went with the easier solution to get things off
the ground instead of dealing with adding an extra parameter to layers
of config-dependent gfp API.  I'll revisit this for v2.
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