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 <[email protected]> > Cc: Peter Zijlstra <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]> > Cc: Ingo Molnar <[email protected]> > Cc: Arnaldo Carvalho de Melo <[email protected]> Arnaldo, do the userspace bits look ok?
