On Thu 08-11-12 07:29:23, Tejun Heo wrote:
> Hey, Michal.
>
> On Thu, Nov 08, 2012 at 04:20:39PM +0100, Michal Hocko wrote:
> > > So, in the above example in CPU2, (B->state & FREEZING) test and
> > > freezer_apply_state(C, false) can't be interleaved with the same
> > > inheritance operation from
Hey, Michal.
On Thu, Nov 08, 2012 at 04:20:39PM +0100, Michal Hocko wrote:
> > So, in the above example in CPU2, (B->state & FREEZING) test and
> > freezer_apply_state(C, false) can't be interleaved with the same
> > inheritance operation from CPU1. They either happen before or after.
>
> I am n
On Thu 08-11-12 06:18:48, Tejun Heo wrote:
> Hello, Michal.
>
> On Thu, Nov 08, 2012 at 03:08:52PM +0100, Michal Hocko wrote:
> > This seems to be racy because parent->state access is not linearized.
> > Say we have parallel freeze and thawing on a tree like the following:
> > A
> > |
> >
Hello, Michal.
On Thu, Nov 08, 2012 at 03:08:52PM +0100, Michal Hocko wrote:
> This seems to be racy because parent->state access is not linearized.
> Say we have parallel freeze and thawing on a tree like the following:
> A
> |
> B
> |
> C
>
> pre_order will vi
On Wed 07-11-12 08:39:19, Tejun Heo wrote:
[...]
> --- a/kernel/cgroup_freezer.c
> +++ b/kernel/cgroup_freezer.c
[...]
> @@ -320,14 +388,39 @@ static void freezer_apply_state(struct f
> * @freezer: freezer of interest
> * @freeze: whether to freeze or thaw
> *
> - * Freeze or thaw @cgroup acc
Up until now, cgroup_freezer didn't implement hierarchy properly.
cgroups could be arranged in hierarchy but it didn't make any
difference in how each cgroup_freezer behaved. They all operated
separately.
This patch implements proper hierarchy support. If a cgroup is
frozen, all its descendants
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