On Sat, Nov 14, 2015 at 03:45:52PM +0300, Vladimir Davydov wrote: > On Thu, Nov 12, 2015 at 06:41:22PM -0500, Johannes Weiner wrote: > > When charging socket memory, the code currently checks only the local > > page counter for excess to determine whether the memcg is under socket > > pressure. But even if the local counter is fine, one of the ancestors > > could have breached its limit, which should also force this child to > > enter socket pressure. This currently doesn't happen. > > > > Fix this by using page_counter_try_charge() first. If that fails, it > > means that either the local counter or one of the ancestors are in > > excess of their limit, and the child should enter socket pressure. > > > > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> > > Reviewed-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> Thanks Vladimir! > For the record: it was broken by commit 3e32cb2e0a12 ("mm: memcontrol: > lockless page counters"). I didn't realize that. Fixes: 3e32cb2e0a12 ("mm: memcontrol: lockless page counters") -- 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>