On 03/03/2016 09:57 PM, Hugh Dickins wrote: > >> >> I do not have an explanation why it would cause oom sooner but this >> turned out to be incomplete. There is another wmaark check deeper in the >> compaction path. Could you try the one from >> http://lkml.kernel.org/r/20160302130022.gg26...@dhcp22.suse.cz > > I've now added that in: it corrects the "sooner", but does not make > any difference to the fact of OOMing for me.
Could you try producing a trace with echo 1 > /debug/tracing/events/compaction/enable echo 1 > /debug/tracing/events/migrate/mm_migrate_pages/enable Hopefully it will hint at what's wrong with: compact_migrate_scanned 424920 compact_free_scanned 9278408 compact_isolated 469472 compact_stall 377 compact_fail 297 compact_success 80 compact_kcompatd_wake 0
