Messages in this thread | | | Subject | Re: [PATCH 1/2] perf_events: add cgroup support (v8) | From | Peter Zijlstra <> | Date | Wed, 02 Feb 2011 12:29:20 +0100 |
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On Thu, 2011-01-20 at 15:39 +0100, Peter Zijlstra wrote: > On Thu, 2011-01-20 at 15:30 +0200, Stephane Eranian wrote: > > @@ -4259,8 +4261,20 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks) > > > > /* Reassign the task to the init_css_set. */ > > task_lock(tsk); > > + /* > > + * we mask interrupts to prevent: > > + * - timer tick to cause event rotation which > > + * could schedule back in cgroup events after > > + * they were switched out by perf_cgroup_sched_out() > > + * > > + * - preemption which could schedule back in cgroup events > > + */ > > + local_irq_save(flags); > > + perf_cgroup_sched_out(tsk); > > cg = tsk->cgroups; > > tsk->cgroups = &init_css_set; > > + perf_cgroup_sched_in(tsk); > > + local_irq_restore(flags); > > task_unlock(tsk); > > if (cg) > > put_css_set_taskexit(cg); > > So you too need a callback on cgroup change there.. Li, Paul, any chance > we can fix this cgroup_subsys::exit callback? The scheduler code needs > to do funny thing because its in the wrong place as well.
cgroup guys? Shall I just fix this exit thing since the only user seems to be the scheduler and now perf for both of which its unfortunate at best?
Balbir, memcontrol.c uses pre_destroy(), I pose that using this method is broken per definition since it makes the cgroup empty notification void.
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