Hello, Linus.
Three more patches to fix cgroup_freezer breakage due to the recent
cgroup internal locking changes - an operation cgroup_freezer was
using now requires sleepable context and cgroup_freezer was invoking
that while holding a spin lock. cgroup_freezer was using an overly
elaborate hierarchical locking scheme.
While it's possible to convert the hierarchical spinlocks directly to
mutexes, this patch simplifies the overall locking so that it uses a
global mutex. This has the added benefit of avoiding iterating
potentially huge number of tasks under a spinlock. While the patch is
on the larger side in the devel cycle, the changes made are mostly
straight-forward and the locking logic is a lot simpler afterwards.
The following changes since commit 36c38fb7144aa941dc072ba8f58b2dbe509c0345:
blkcg: use trylock on blkcg_pol_mutex in blkcg_reset_stats() (2014-05-05 13:48:18 -0400)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-3.15-fixes
for you to fetch changes up to 36e9d2ebcc15d029b33f42a36146ab5a5bcfcfe7:
cgroup: fix rcu_read_lock() leak in update_if_frozen() (2014-05-13 11:28:30 -0400)
Thanks.
----------------------------------------------------------------
Tejun Heo (3):
cgroup: introduce task_css_is_root()
cgroup_freezer: replace freezer->lock with freezer_mutex
cgroup: fix rcu_read_lock() leak in update_if_frozen()
include/linux/cgroup.h | 15 +++++++
kernel/cgroup.c | 2 +-
kernel/cgroup_freezer.c | 116 ++++++++++++++++++++----------------------------
3 files changed, 65 insertions(+), 68 deletions(-)
--
tejun
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