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(-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>