On 09/18/2010 11:21 AM, Minchan Kim wrote:
When memory pressure in memcg is high, do_try_to_free_pages returns 0. It causes mem_cgroup_out_of_memory so that any process in mem group would be killed. But vmscan-check-all_unreclaimable-in-direct-reclaim-path.patch changed the old behavior. It returns 1 unconditionally regardless of considering global reclaim or memcg relcaim. It causes hang without triggering OOM in case of memcg direct reclaim. This patch fixes it. It's reported by caiqian@xxxxxxxxxxx (Thanks. Totally, it's my fault.) Reported-by: caiqian@xxxxxxxxxx Cc: KOSAKI Motohiro<kosaki.motohiro@xxxxxxxxxxxxxx> Cc: Johannes Weiner<hannes@xxxxxxxxxxx> Cc: Rik van Riel<riel@xxxxxxxxxx> Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: Balbir Singh<balbir@xxxxxxxxxx> Signed-off-by: Minchan Kim<minchan.kim@xxxxxxxxx>
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