[PATCH v4 3/4] sock: Fix misuse of sk_under_memory_pressure()

[Abel Wu <wuyun.abel@xxxxxxxxxxxxx>]

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@xxxxxxxxxxxxx>
---
 include/net/sock.h | 9 +++++++--
 net/core/sock.c    | 2 +-
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index b0e5533e5909..257706710be5 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1409,13 +1409,18 @@ static inline bool sk_has_memory_pressure(const struct sock *sk)
 	return sk->sk_prot->memory_pressure != NULL;
 }
 
+static inline bool sk_under_global_memory_pressure(const struct sock *sk)
+{
+	return sk->sk_prot->memory_pressure &&
+		*sk->sk_prot->memory_pressure;
+}
+
 static inline bool sk_under_memory_pressure(const struct sock *sk)
 {
 	if (mem_cgroup_under_socket_pressure(sk->sk_memcg))
 		return true;
 
-	return sk->sk_prot->memory_pressure &&
-		*sk->sk_prot->memory_pressure;
+	return sk_under_global_memory_pressure(sk);
 }
 
 static inline long
diff --git a/net/core/sock.c b/net/core/sock.c
index 5440e67bcfe3..801df091e37a 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -3095,7 +3095,7 @@ 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);
 }
-- 
2.37.3