linux-kernel - Re: [PATCH] mm: avoid livelock on !__GFP

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Message-ID: <alpine.DEB.2.00.1110252322220.20273@chino.kir.corp.google.com>
Date:	Tue, 25 Oct 2011 23:24:02 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Colin Cross <ccross@...roid.com>
cc:	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org
Subject: Re: [PATCH] mm: avoid livelock on !__GFP_FS allocations

On Tue, 25 Oct 2011, Colin Cross wrote:

> > Or, rather, when pm_restrict_gfp_mask() clears __GFP_IO and __GFP_FS that
> > it also has the same behavior as __GFP_NORETRY in should_alloc_retry() by
> > setting a variable in file scope.
> >
> 
> Why do you prefer that over adding a gfp_required_mask?
> 

Because it avoids an unnecessary OR in the page and slab allocator 
fastpaths which are red hot :)
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