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authorAbel Wu <wuyun.abel@bytedance.com>2023-08-16 12:12:22 +0300
committerJakub Kicinski <kuba@kernel.org>2023-08-17 21:34:36 +0300
commit2d0c88e84e483982067a82073f6125490ddf3614 (patch)
tree67c0cf39835c1aa1593cd7f1febbe744d6752f09 /net
parent54c9016eb8eda55952a195b071359cd13f50ed9b (diff)
downloadlinux-2d0c88e84e483982067a82073f6125490ddf3614.tar.xz
sock: Fix misuse of sk_under_memory_pressure()
The status of global socket memory pressure is updated when: a) __sk_mem_raise_allocated(): enter: sk_memory_allocated(sk) > sysctl_mem[1] leave: sk_memory_allocated(sk) <= sysctl_mem[0] b) __sk_mem_reduce_allocated(): leave: sk_under_memory_pressure(sk) && sk_memory_allocated(sk) < sysctl_mem[0] So the conditions of leaving global pressure are inconstant, which may lead to the situation that one pressured net-memcg prevents the global pressure from being cleared when there is indeed no global pressure, thus the global constrains are still in effect unexpectedly on the other sockets. This patch fixes this by ignoring the net-memcg's pressure when deciding whether should leave global memory pressure. Fixes: e1aab161e013 ("socket: initial cgroup code.") Signed-off-by: Abel Wu <wuyun.abel@bytedance.com> Acked-by: Shakeel Butt <shakeelb@google.com> Link: https://lore.kernel.org/r/20230816091226.1542-1-wuyun.abel@bytedance.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net')
-rw-r--r--net/core/sock.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index 732fc37a4771..c9cffb7acbea 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -3159,7 +3159,7 @@ void __sk_mem_reduce_allocated(struct sock *sk, int amount)
if (mem_cgroup_sockets_enabled && sk->sk_memcg)
mem_cgroup_uncharge_skmem(sk->sk_memcg, amount);
- if (sk_under_memory_pressure(sk) &&
+ if (sk_under_global_memory_pressure(sk) &&
(sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)))
sk_leave_memory_pressure(sk);
}