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

[Rik van Riel]

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@xxxxxxxxx>
> Signed-off-by: Mel Gorman<mgorman@xxxxxxx>

Acked-by: Rik van Riel<riel@xxxxxxxxxx>

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