linux-kernel - Re: [PATCH 07/12] mm: Add support for direct

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Message-ID: <4FE20378.70105@redhat.com>
Date:	Wed, 20 Jun 2012 13:08:08 -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 07/12] mm: Add support for direct_IO to highmem pages

On 06/20/2012 05:37 AM, Mel Gorman wrote:
> The patch "mm: Add support for a filesystem to activate swap files and
> use direct_IO for writing swap pages" added support for using direct_IO
> to write swap pages but it is insufficient for highmem pages.
>
> To support highmem pages, this patch kmaps() the page before calling the
> direct_IO() handler. As direct_IO deals with virtual addresses an
> additional helper is necessary for get_kernel_pages() to lookup the
> struct page for a kmap virtual address.
>
> Signed-off-by: Mel Gorman<mgorman@...e.de>

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

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