linux-kernel - Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace

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Date:	Mon, 27 Jun 2016 17:50:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Aravinda Prasad <aravinda@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	mingo@...hat.com, paulus@...ba.org, acme@...nel.org,
	ebiederm@...ssion.com, hbathini@...ux.vnet.ibm.com,
	ananth@...ibm.com
Subject: Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace

On Tue, Jun 14, 2016 at 10:19:51PM +0530, Aravinda Prasad wrote:
> Whenever perf tool is executed inside a container, this
> patch restricts the events to the perf-namespace in which
> the perf tool is executing.
> 
> This patch is based on the existing support available
> for tracing with cgroups.
> 
> TODO:
>     - Avoid code duplication.

Can't you, at perf_event_open() time, convert a per-cpu event into a
per-cpu-per-cgroup event for these namespace thingies?

That seems to immediately and completely remove all that duplication.