Hello, Aleksa.
On Sat, Apr 25, 2015 at 12:07:34AM +1000, Aleksa Sarai wrote:
> Would something like this suffice?
>
> struct cgroup_subsys_state *task_get_css(struct task_struct *task, int
> subsys_id) {
> bool have_ref = false;
> struct cgroup_subsys_state *css;
>
> while(!have_ref) {
> rcu_read_lock();
> css = task_css(task, subsys_id);
> have_ref = !css_tryget(css);
> rcu_read_unlock();
> }
>
> return css;
> }
I was thinking why this felt so familiar and realized that I have the
patch pending.
http://lkml.kernel.org/g/1428350318-8215-8-git-send-email-tj@xxxxxxxxxx
Please feel free to include it in the patch series. I'll sort out the
merging later.
> Also, as a side note (in the same vein I guess), does a ref on a
> css_set give you an implicit ref on a css inside that css_set, or are
> those two orthogonal operations?
Yes, it does, but if you're gonna depend on that, please document that.
Thanks.
--
tejun
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