linux-kernel - Re: [PATCH 2/2] cgroup, perf_event: make perf_event controller work on cgroup2 hierarchy

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Date:	Tue, 8 Mar 2016 11:11:34 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	lizefan@...wei.com, hannes@...xchg.org, mingo@...hat.com,
	acme@...nel.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 2/2] cgroup, perf_event: make perf_event controller work
 on cgroup2 hierarchy

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@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>

Arnaldo, do the userspace bits look ok?