net: tcp_memcontrol: remove bogus hierarchy pressure propagation

When a cgroup currently breaches its socket memory limit, it enters
memory pressure mode for itself and its *ancestors*.  This throttles
transmission in unrelated sibling and cousin subtrees that have nothing
to do with the breached limit.

On the contrary, breaching a limit should make that group and its
*children* enter memory pressure mode.  But this happens already, albeit
lazily: if an ancestor limit is breached, siblings will enter memory
pressure on their own once the next packet arrives for them.

So no additional hierarchy code is needed.  Remove the bogus stuff.

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>

diff --git a/include/net/sock.h b/include/net/sock.h
index 9ef3d7c..d3b035c 100644 (file)
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1155,14 +1155,8 @@ static inline void sk_leave_memory_pressure(struct sock *sk)
        if (*memory_pressure)
                *memory_pressure = 0;
 
-       if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
-               struct cg_proto *cg_proto = sk->sk_cgrp;
-               struct proto *prot = sk->sk_prot;
-
-               for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
-                       cg_proto->memory_pressure = 0;
-       }
-
+       if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+               sk->sk_cgrp->memory_pressure = 0;
 }
 
 static inline void sk_enter_memory_pressure(struct sock *sk)
@@ -1170,13 +1164,8 @@ static inline void sk_enter_memory_pressure(struct sock *sk)
        if (!sk->sk_prot->enter_memory_pressure)
                return;
 
-       if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
-               struct cg_proto *cg_proto = sk->sk_cgrp;
-               struct proto *prot = sk->sk_prot;
-
-               for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
-                       cg_proto->memory_pressure = 1;
-       }
+       if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+               sk->sk_cgrp->memory_pressure = 1;
 
        sk->sk_prot->enter_memory_pressure(sk);
 }