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

[Cody P Schafer]

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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