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author | Tejun Heo <tj@kernel.org> | 2011-11-21 12:32:25 -0800 |
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committer | Tejun Heo <tj@kernel.org> | 2011-11-21 12:32:25 -0800 |
commit | 22b4e111fa01a1147aa562ceaf18a752a928ef4e (patch) | |
tree | f4b29f532678c72edf99bb8df3ba64d526bc8a3c /kernel/power/process.c | |
parent | 03afed8bc296fa70186ba832c1126228bb992465 (diff) | |
download | linux-22b4e111fa01a1147aa562ceaf18a752a928ef4e.tar.gz |
cgroup_freezer: prepare for removal of TIF_FREEZE
TIF_FREEZE will be removed soon and freezing() will directly test whether any freezing condition is in effect. Make the following changes in preparation. * Rename cgroup_freezing_or_frozen() to cgroup_freezing() and make it return bool. * Make cgroup_freezing() access task_freezer() under rcu read lock instead of task_lock(). This makes the state dereferencing racy against task moving to another cgroup; however, it was already racy without this change as ->state dereference wasn't synchronized. This will be later dealt with using attach hooks. * freezer->state is now set before trying to push tasks into the target state. -v2: Oleg pointed out that freeze_change_state() was setting freeze->state incorrectly to CGROUP_FROZEN instead of CGROUP_FREEZING. Fixed. -v3: Matt pointed out that setting CGROUP_FROZEN used to always invoke try_to_freeze_cgroup() regardless of the current state. Patch updated such that the actual freeze/thaw operations are always performed on invocation. This shouldn't make any difference unless something is broken. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Paul Menage <paul@paulmenage.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Oleg Nesterov <oleg@redhat.com>
Diffstat (limited to 'kernel/power/process.c')
-rw-r--r-- | kernel/power/process.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/power/process.c b/kernel/power/process.c index ce643838a00c..9f6f5c755cfa 100644 --- a/kernel/power/process.c +++ b/kernel/power/process.c @@ -170,7 +170,7 @@ void thaw_processes(void) read_lock(&tasklist_lock); do_each_thread(g, p) { - if (cgroup_freezing_or_frozen(p)) + if (cgroup_freezing(p)) continue; __thaw_task(p); |