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

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Message-ID: <20160712130430.GQ30909@twins.programming.kicks-ass.net>
Date:	Tue, 12 Jul 2016 15:04:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Nikolay Borisov <kernel@...p.com>
Cc:	Aravinda Prasad <aravinda@...ux.vnet.ibm.com>,
	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, Jul 12, 2016 at 03:41:42PM +0300, Nikolay Borisov wrote:

> Namespaces and cgroups are completely orthogonal to one another. 

Then how do you specify what your new 'root' is? Surely you must first
create a cgroup and then confine yourself to that?

> Also in the v1 of cgroups it's possible to have a process member of
> more than 1 cgroup.

Yeah, so? We only care about the perf controller obviously.