From 1398eee08222a038fa5f017900f387e81f6e3ff4 Mon Sep 17 00:00:00 2001 From: Glauber Costa Date: Thu, 12 Jan 2012 02:16:06 +0000 Subject: [PATCH] net: decrement memcg jump label when limit, not usage, is changed The logic of the current code is that whenever we destroy a cgroup that had its limit set (set meaning different than maximum), we should decrement the jump_label counter. Otherwise we assume it was never incremented. But what the code actually does is test for RES_USAGE instead of RES_LIMIT. Usage being different than maximum is likely to be true most of the time. The effect of this is that the key must become negative, and since the jump_label test says: !!atomic_read(&key->enabled); we'll have jump_labels still on when no one else is using this functionality. Signed-off-by: Glauber Costa CC: David S. Miller Signed-off-by: David S. Miller --- net/ipv4/tcp_memcontrol.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/ipv4/tcp_memcontrol.c b/net/ipv4/tcp_memcontrol.c index 7fed04f875c1..49978788a9dc 100644 --- a/net/ipv4/tcp_memcontrol.c +++ b/net/ipv4/tcp_memcontrol.c @@ -108,7 +108,7 @@ void tcp_destroy_cgroup(struct cgroup *cgrp, struct cgroup_subsys *ss) tcp = tcp_from_cgproto(cg_proto); percpu_counter_destroy(&tcp->tcp_sockets_allocated); - val = res_counter_read_u64(&tcp->tcp_memory_allocated, RES_USAGE); + val = res_counter_read_u64(&tcp->tcp_memory_allocated, RES_LIMIT); if (val != RESOURCE_MAX) jump_label_dec(&memcg_socket_limit_enabled);