tree bdaa3a9f9d0535c07d1dfd8f055cca8d63d61b2d
parent 7d828602e5ef3297a69392a2d31264e4ab9c8bb7
author Johannes Weiner <hannes@cmpxchg.org> 1452813659 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> 1452816049 -0800

net: tcp_memcontrol: properly detect ancestor socket pressure

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.

Fixes: 3e32cb2e0a12 ("mm: memcontrol: lockless page counters")
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: David S. Miller <davem@davemloft.net>
Reviewed-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>