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| author | Tejun Heo <tj@kernel.org> | 2014-02-25 09:56:49 -0500 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-02-25 09:56:49 -0500 |
| commit | f153ad11bca27996a5e8e1782557e36e80b03a8c (patch) | |
| tree | df87bf56d2c7fb6d7b3122ed838ce652337b08a3 /kernel/cgroup.c | |
| parent | dc5736ed7aaf942caaac0c15af74a018e04ec79d (diff) | |
| parent | 532de3fc72adc2a6525c4d53c07bf81e1732083d (diff) | |
| download | lwn-f153ad11bca27996a5e8e1782557e36e80b03a8c.tar.gz lwn-f153ad11bca27996a5e8e1782557e36e80b03a8c.zip | |
Merge branch 'cgroup/for-3.14-fixes' into cgroup/for-3.15
Pull in for-3.14-fixes to receive 532de3fc72ad ("cgroup: update
cgroup_enable_task_cg_lists() to grab siglock") which conflicts with
afeb0f9fd425 ("cgroup: relocate cgroup_enable_task_cg_lists()") and
the following cg_lists updates. This is likely to cause further
conflicts down the line too, so let's merge it early.
As cgroup_enable_task_cg_lists() is relocated in for-3.15, this merge
causes conflict in the original position. It's resolved by applying
siglock changes to the updated version in the new location.
Conflicts:
kernel/cgroup.c
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 771d1b8aaae9..8ab800c7bac0 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -1331,9 +1331,13 @@ static void cgroup_enable_task_cg_lists(void) * We should check if the process is exiting, otherwise * it will race with cgroup_exit() in that the list * entry won't be deleted though the process has exited. + * Do it while holding siglock so that we don't end up + * racing against cgroup_exit(). */ + spin_lock_irq(&p->sighand->siglock); if (!(p->flags & PF_EXITING)) list_add(&p->cg_list, &task_css_set(p)->tasks); + spin_unlock_irq(&p->sighand->siglock); task_unlock(p); } while_each_thread(g, p); @@ -3968,16 +3972,12 @@ static int __init cgroup_wq_init(void) /* * There isn't much point in executing destruction path in * parallel. Good chunk is serialized with cgroup_mutex anyway. - * - * XXX: Must be ordered to make sure parent is offlined after - * children. The ordering requirement is for memcg where a - * parent's offline may wait for a child's leading to deadlock. In - * the long term, this should be fixed from memcg side. + * Use 1 for @max_active. * * We would prefer to do this in cgroup_init() above, but that * is called before init_workqueues(): so leave this until after. */ - cgroup_destroy_wq = alloc_ordered_workqueue("cgroup_destroy", 0); + cgroup_destroy_wq = alloc_workqueue("cgroup_destroy", 0, 1); BUG_ON(!cgroup_destroy_wq); /* |