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

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Message-Id: <20110901162808.80a2117c.akpm@linux-foundation.org>
Date:	Thu, 1 Sep 2011 16:28:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	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, 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 ;)

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