Re: [PATCHSET] perf, cgroup: implement hierarchy support forperf_event controller

From: Ingo Molnar
Date: Wed Apr 10 2013 - 05:38:06 EST

* Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> wrote:

> On Mon, 2013-04-08 at 19:23 -0700, Tejun Heo wrote:
> > perf_event cgroup controller is one of the remaining few with broken
> > hierarchy support. It turns out it's pretty easy to implement - the
> > only thing necessary is making perf_cgroup_match() return %true also
> > when the cgroup of the current task is a descendant of the event's
> > cgroup. This patchset implements cgroup_is_descendant() and uses it
> > to implement hierarchy support in perf_event controller.
> >
> > This patchset contains the following three patches.
> >
> > 0001-cgroup-make-sure-parent-won-t-be-destroyed-before-it.patch
> > 0002-cgroup-implement-cgroup_is_descendant.patch
> > 0003-perf-make-perf_event-cgroup-hierarchical.patch
> Thanks, looks simple and straight fwd.
> > Ingo, how should these be routed?
> >
> > git:// perf_event-hierarchy-support
> Ingo typically likes multi-maintainer sets to be pulled from a common
> tree into all relevant maintainer trees so that git merges afterwards
> just-work (tm). But I'll let him expand.

Yeah - at least for larger changes that's a good workflow.

For smaller changes we can pick one or the other tree. Tejun, do these changes
create any conflicts with the current tip:master tree? If not then you could carry
these changes in your tree. If there's significant conflicts then it might be
better to rebase this on top of perf/core and pull them into perf/core. (assuming
there's no other cgroups prereq patches beyond the ones in this series.)


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