netdev - [PATCH 0/3] Fix problem with static

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Message-Id: <1334875758-20939-1-git-send-email-glommer@parallels.com>
Date:	Thu, 19 Apr 2012 19:49:15 -0300
From:	Glauber Costa <glommer@...allels.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	<netdev@...r.kernel.org>, <cgroups@...r.kernel.org>,
	Li Zefan <lizefan@...wei.com>,
	<kamezawa.hiroyu@...fujitsu.com>,
	David Miller <davem@...emloft.net>, <devel@...nvz.org>
Subject: [PATCH 0/3] Fix problem with static_key decrement

Hi,

This is my proposed fix for the sock memcg static_key
problem raised by Kamezawa. It works for me, but I would
Kame, please confirm.

For that to work, I am dependent on two cgroup patches
that goes attached. The rationale behind it, is that we
can't do static_key updates with the cgroup_mutex held,
or we risk deadlocking.

Looking closely, there seem to be no particular reason
to hold the cgroup_mutex during destruction. Subsystems
that really need it, can hold it themselves.

Tejun, let me know if this is acceptable from your PoV.

Glauber Costa (3):
  don't attach a task to a dead cgroup
  don't take cgroup_mutex in destroy()
  decrement static keys on real destroy time

 block/blk-cgroup.c        |    2 +
 include/net/sock.h        |    9 +++++++
 kernel/cgroup.c           |   12 ++++++----
 kernel/cpuset.c           |    2 +
 mm/memcontrol.c           |   20 +++++++++++++++-
 net/ipv4/tcp_memcontrol.c |   52 ++++++++++++++++++++++++++++++++++++++------
 6 files changed, 83 insertions(+), 14 deletions(-)

-- 
1.7.7.6

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