linux-kernel - Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes

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Message-ID: <alpine.DEB.2.20.1701191851310.5358@nanos>
Date:   Thu, 19 Jan 2017 18:54:25 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     David Carrillo-Cisneros <davidcc@...gle.com>
cc:     Shivappa Vikas <vikas.shivappa@...el.com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        x86 <x86@...nel.org>, hpa@...or.com,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, andi.kleen@...el.com,
        "H. Peter Anvin" <h.peter.anvin@...el.com>
Subject: Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes

On Thu, 19 Jan 2017, David Carrillo-Cisneros wrote:
> A 1:1 mapping between CLOSID/"Resource group" to RMID, as Fenghua suggested
> is very problematic because the number of CLOSIDs is much much smaller than the
> number of RMIDs, and, as Stephane mentioned it's a common use case to want to
> independently monitor many task/cgroups inside an allocation partition.

Again, that was not my intention. I just want to limit the combinations.

> A 1:many mapping of CLOSID to RMIDs may work as a cheap replacement of
> cgroup monitoring but the case where CLOSID changes would be messy. In

CLOSIDs of RDT groups do not change. They are allocated when the group is
created.

Thanks,

	tglx