Messages in this thread | | | Date | Tue, 8 Mar 2016 11:11:34 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 2/2] cgroup, perf_event: make perf_event controller work on cgroup2 hierarchy |
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On Wed, Feb 24, 2016 at 05:12:55PM -0500, Tejun Heo wrote: > perf_event is a utility controller whose primary role is identifying > cgroup membership to filter perf events; however, because it also > tracks some per-css state, it can't be replaced by pure cgroup > membership test. Mark the controller as implicitly enabled on the > default hierarchy so that perf events can always be filtered based on > cgroup v2 path as long as the controller is not mounted on a legacy > hierarchy. > > "perf record" is updated accordingly so that it searches for both v1 > and v2 hierarchies. A v1 hierarchy is used if perf_event is mounted > on it; otherwise, it uses the v2 hierarchy. > > v2: Doc updated to reflect more flexible rebinding behavior. > > Signed-off-by: Tejun Heo <tj@kernel.org> > Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> Cc: Ingo Molnar <mingo@redhat.com> > Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Arnaldo, do the userspace bits look ok?
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