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authorLinus Torvalds <torvalds@linux-foundation.org>2011-11-28 13:55:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-11-28 13:55:59 -0800
commita34815b96f9a21b3a2e2912dfd0d994acd2855e3 (patch)
treee2e6ac428637059305d7c00274f0c034f0c82858 /kernel
parent9b5a4d4f65e260a109eaeea8bbc8062a7c58b55e (diff)
parent884a45d964dd395eda945842afff5e16bcaedf56 (diff)
Merge branch 'for-3.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
* 'for-3.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cgroup_freezer: fix freezing groups with stopped tasks
Diffstat (limited to 'kernel')
-rw-r--r--kernel/cgroup_freezer.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 5e828a2ca8e..213c0351dad 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -153,6 +153,13 @@ static void freezer_destroy(struct cgroup_subsys *ss,
kfree(cgroup_freezer(cgroup));
}
+/* task is frozen or will freeze immediately when next it gets woken */
+static bool is_task_frozen_enough(struct task_struct *task)
+{
+ return frozen(task) ||
+ (task_is_stopped_or_traced(task) && freezing(task));
+}
+
/*
* The call to cgroup_lock() in the freezer.state write method prevents
* a write to that file racing against an attach, and hence the
@@ -231,7 +238,7 @@ static void update_if_frozen(struct cgroup *cgroup,
cgroup_iter_start(cgroup, &it);
while ((task = cgroup_iter_next(cgroup, &it))) {
ntotal++;
- if (frozen(task))
+ if (is_task_frozen_enough(task))
nfrozen++;
}
@@ -284,7 +291,7 @@ static int try_to_freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
while ((task = cgroup_iter_next(cgroup, &it))) {
if (!freeze_task(task, true))
continue;
- if (frozen(task))
+ if (is_task_frozen_enough(task))
continue;
if (!freezing(task) && !freezer_should_skip(task))
num_cant_freeze_now++;