netdev - Re: [PATCH 03/10] mm: Add support for a filesystem to control swap files

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Date:	Fri, 9 Sep 2011 09:36:12 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Christoph Hellwig <hch@...radead.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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Trond Myklebust <Trond.Myklebust@...app.com>,
	Neil Brown <neilb@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 03/10] mm: Add support for a filesystem to control swap
 files

On Fri, Sep 09, 2011 at 02:15:50PM +0100, Mel Gorman wrote:
> 
> I confess I haven't investigated this direction at
> all yet.  Is it correct that your previous objection was
> http://linux.derkeiler.com/Mailing-Lists/Kernel/2009-10/msg00455.html
> and the direct-IO patchset you were thinking of was
> http://copilotco.com/mail-archives/linux-kernel.2009/msg87176.html ?

Yes.

> If so, are you suggesting that instead of swap_readpage and
> swap_writepage I look into what is required for swap to use ->readpage
> method and ->direct_IO aops?

The equivalent of ->direct_IO should be used for both reads and writes.

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