linux-kernel - Re: [PATCH 0/4] x86: Add Cache QoS Monitoring (CQM) support

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Message-ID: <20140106175338.GF30183@twins.programming.kicks-ass.net>
Date:	Mon, 6 Jan 2014 18:53:38 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>
Cc:	Tejun Heo <tj@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Li Zefan <lizefan@...wei.com>,
	"containers@...ts.linux-foundation.org" 
	<containers@...ts.linux-foundation.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/4] x86: Add Cache QoS Monitoring (CQM) support

On Mon, Jan 06, 2014 at 04:47:57PM +0000, Waskiewicz Jr, Peter P wrote:
> > Yeah that's not accurate, nor desired I think, because you get into
> > horrible problems with hierarchies, do child groups belong to your RMID
> > or not?
> 
> I'd rather not support a child group of a child group.  Only groups off
> the root, and each group would be assigned an RMID when it's activated
> for monitoring.

Yeah, that's a complete non started for cgroups. Cgroups need to be
completely hierarchical.

So even the root group should represent all tasks; which if you fragment
RMIDs on child cgroups doesn't work anymore.
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