linux-kernel - [PATCH 0/3] mm: fixup changers of per cpu pageset's ->high and ->batch

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Message-Id: <1365194030-28939-1-git-send-email-cody@linux.vnet.ibm.com>
Date:	Fri,  5 Apr 2013 13:33:47 -0700
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/3] mm: fixup changers of per cpu pageset's ->high and ->batch

In one case while modifying the ->high and ->batch fields of per cpu pagesets
we're unneededly using stop_machine() (patches 1 & 2), and in another we don't have any
syncronization at all (patch 3).

This patchset fixes both of them.

Note that it results in a change to the behavior of zone_pcp_update(), which is
used by memory_hotplug. I _think_ that I've diserned (and preserved) the
essential behavior (changing ->high and ->batch), and only eliminated unneeded
actions (draining the per cpu pages), but this may not be the case.

--
 mm/page_alloc.c | 63 +++++++++++++++++++++++++++------------------------------
 1 file changed, 30 insertions(+), 33 deletions(-)

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