[Devel] [PATCH 0/3] Fix problem with static_key decrement

[Glauber Costa]

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(-)

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1.7.7.6