linux-kernel - [RFC 0/3] memory-hotplug: handle page race between allocation and isolation

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Message-Id: <1342508505-23492-1-git-send-email-minchan@kernel.org>
Date:	Tue, 17 Jul 2012 16:01:42 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Minchan Kim <minchan@...nel.org>
Subject: [RFC 0/3] memory-hotplug: handle page race between allocation and isolation

Memory hotplug has a subtle race problem so this patchset fixes the problem
(Look at [3/3] for detail and please confirm the problem before review
other patches in this series.)

 [1/3] is just clean up and help for [2/3].
 [2/3] keeps the migratetype information to freed page's index field
       and [3/3] uses the information.
 [3/3] fixes the race problem with [2/3]'s information.

After applying [2/3], migratetype argument in __free_one_page
and free_one_page is redundant so we can remove it but I decide
to not touch them because it increases code size about 50 byte.

Minchan Kim (3):
  mm: use get_page_migratetype instead of page_private
  mm: remain migratetype in freed page
  memory-hotplug: bug fix race between isolation and allocation

 include/linux/mm.h  |   12 ++++++++++++
 mm/page_alloc.c     |   16 ++++++++++------
 mm/page_isolation.c |    7 +++++--
 3 files changed, 27 insertions(+), 8 deletions(-)

-- 
1.7.9.5

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