linux-kernel - Re: [RFC 13/26] SLUB: Add SlabReclaimable() to avoid repeated reclaim attempts

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Message-ID: <Pine.LNX.4.64.0709191100260.11882@schroedinger.engr.sgi.com>
Date:	Wed, 19 Sep 2007 11:00:53 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Rik van Riel <riel@...hat.com>
cc:	Andy Whitcroft <apw@...dowen.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	Christoph Hellwig <hch@....de>, Mel Gorman <mel@...net.ie>,
	David Chinner <dgc@....com>
Subject: Re: [RFC 13/26] SLUB: Add SlabReclaimable() to avoid repeated reclaim
 attempts

On Wed, 19 Sep 2007, Rik van Riel wrote:

> Why is it safe to not use the normal page flag bit operators
> for these page flags operations?

Because SLUB always modifies page flags under PageLock.

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