linux-kernel - Re: [PATCH] thp: tail page refcounting fix #5

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Message-ID: <20110901234527.GD7761@one.firstfloor.org>
Date:	Fri, 2 Sep 2011 01:45:27 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
	Johannes Weiner <jweiner@...hat.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Shaohua Li <shaohua.li@...el.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] thp: tail page refcounting fix #5

On Thu, Sep 01, 2011 at 04:28:08PM -0700, Andrew Morton wrote:
> On Thu, 1 Sep 2011 17:24:17 +0200
> Andrea Arcangeli <aarcange@...hat.com> wrote:
> 
> > Ideally direct-io should stop calling get_page() on pages
> > returned by get_user_pages().
> 
> Yeah.  get_user_pages() is sufficient.  Ideally we should be able to
> undo the get_user_pages() get_page() from within the IO completion
> interrupt and we're done.
> 
> Cc Andi, who is our resident dio tweaker ;)
> 

Noted, I'll put it on my list.

Should not be too difficult from a quick look, just the convoluted
nature of direct-io.c requires a lot of double checking.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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