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authorTejun Heo <tj@kernel.org>2011-11-21 12:32:24 -0800
committerTejun Heo <tj@kernel.org>2011-11-21 12:32:24 -0800
commit0c9af09262864a2744091ee94c98c4a8fd60c98b (patch)
treee7dacbb7f370e0d7c515ed743a2c5b5179a1de5e /kernel/cgroup_freezer.c
parent6cd8dedcdd8e8de01391a7cf25f0b2afeb24f8f4 (diff)
freezer: use dedicated lock instead of task_lock() + memory barrier
Freezer synchronization is needlessly complicated - it's by no means a hot path and the priority is staying unintrusive and safe. This patch makes it simply use a dedicated lock instead of piggy-backing on task_lock() and playing with memory barriers. On the failure path of try_to_freeze_tasks(), locking is moved from it to cancel_freezing(). This makes the frozen() test racy but the race here is a non-issue as the warning is printed for tasks which failed to enter frozen for 20 seconds and race on PF_FROZEN at the last moment doesn't change anything. This simplifies freezer implementation and eases further changes including some race fixes. Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup_freezer.c')
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