linux-kernel - Re: [PATCH 09/12] nfs: disable data cache revalidation for swapfiles

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Date:	Wed, 20 Jun 2012 13:16:27 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	Linux-NFS <linux-nfs@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Neil Brown <neilb@...e.de>,
	Christoph Hellwig <hch@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Christie <michaelc@...wisc.edu>,
	Eric B Munson <emunson@...bm.net>
Subject: Re: [PATCH 09/12] nfs: disable data cache revalidation for swapfiles

On 06/20/2012 05:37 AM, Mel Gorman wrote:
> The VM does not like PG_private set on PG_swapcache pages. As suggested
> by Trond in http://lkml.org/lkml/2006/8/25/348, this patch disables
> NFS data cache revalidation on swap files.  as it does not make
> sense to have other clients change the file while it is being used as
> swap. This avoids setting PG_private on swap pages, since there ought
> to be no further races with invalidate_inode_pages2() to deal with.
>
> Since we cannot set PG_private we cannot use page->private which
> is already used by PG_swapcache pages to store the nfs_page. Thus
> augment the new nfs_page_find_request logic.
>
> Signed-off-by: Peter Zijlstra<a.p.zijlstra@...llo.nl>
> Signed-off-by: Mel Gorman<mgorman@...e.de>

Acked-by: Rik van Riel<riel@...hat.com>

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