The patch titled
Subject: net: tcp_memcontrol: remove bogus hierarchy pressure propagation
has been added to the -mm tree. Its filename is
net-tcp_memcontrol-remove-bogus-hierarchy-pressure-propagation.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/net-tcp_memcontrol-remove-bogus-hierarchy-pressure-propagation.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/net-tcp_memcontrol-remove-bogus-hierarchy-pressure-propagation.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: 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@xxxxxxxxxxx>
Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
Reviewed-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/net/sock.h | 19 ++++---------------
1 file changed, 4 insertions(+), 15 deletions(-)
diff -puN include/net/sock.h~net-tcp_memcontrol-remove-bogus-hierarchy-pressure-propagation include/net/sock.h
--- a/include/net/sock.h~net-tcp_memcontrol-remove-bogus-hierarchy-pressure-propagation
+++ a/include/net/sock.h
@@ -1153,14 +1153,8 @@ static inline void sk_leave_memory_press
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)
@@ -1168,13 +1162,8 @@ static inline void sk_enter_memory_press
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);
}
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
maintainers-make-vladimir-co-maintainer-of-the-memory-controller.patch
mm-page_alloc-generalize-the-dirty-balance-reserve.patch
proc-meminfo-estimate-available-memory-more-conservatively.patch
mm-memcontrol-export-root_mem_cgroup.patch
net-tcp_memcontrol-properly-detect-ancestor-socket-pressure.patch
net-tcp_memcontrol-remove-bogus-hierarchy-pressure-propagation.patch
net-tcp_memcontrol-protect-all-tcp_memcontrol-calls-by-jump-label.patch
net-tcp_memcontrol-remove-dead-per-memcg-count-of-allocated-sockets.patch
net-tcp_memcontrol-simplify-the-per-memcg-limit-access.patch
net-tcp_memcontrol-sanitize-tcp-memory-accounting-callbacks.patch
net-tcp_memcontrol-simplify-linkage-between-socket-and-page-counter.patch
mm-memcontrol-generalize-the-socket-accounting-jump-label.patch
mm-memcontrol-do-not-account-memoryswap-on-unified-hierarchy.patch
mm-memcontrol-move-socket-code-for-unified-hierarchy-accounting.patch
mm-memcontrol-account-socket-memory-in-unified-hierarchy-memory-controller.patch
mm-memcontrol-hook-up-vmpressure-to-socket-pressure.patch
mm-memcontrol-switch-to-the-updated-jump-label-api.patch
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