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

From	"Luck, Tony" <tony.luck@intel.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes
Date	2017-02-03 19:00 +0100
Message-ID	<t6Qjp-4OT-35@gated-at.bofh.it> (permalink)
References	(5 earlier) <t6voC-8cY-23@gated-at.bofh.it> <t6wb0-hZ-17@gated-at.bofh.it> <t6ziy-2dQ-17@gated-at.bofh.it> <t6BaF-3o4-1@gated-at.bofh.it> <t6BDH-3Nz-1@gated-at.bofh.it>
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On Thu, Feb 02, 2017 at 06:14:05PM -0800, David Carrillo-Cisneros wrote:
> If we tie allocation groups and monitoring groups, we are tying the
> meaning of CPUs and we'll have to choose between the CAT meaning or
> the perf meaning.
> 
> Let's allow semantics that will allow perf like monitoring to
> eventually work, even if its not immediately supported.

Would it work to make monitor groups be "task list only" or "cpu mask only"
(unlike control groups that allow mixing).

Then the intel_rdt_sched_in() code could pick the RMID in ways that
give you the perf(1) meaning. I.e. if you create a monitor group and assign
some CPUs to it, then we will always load the RMID for that monitor group
when running on those cpus, regardless of what group(s) the current process
belongs to.  But if you didn't create any cpu-only monitor groups, then we'd
assign RMID using same rules as CLOSID (so measurements from a control group
would track allocation policies).

We are already planning that creating monitor only groups will change
what is reported in the control group (e.g. you pull some tasks out of
the control group to monitor them separately, so the control group only
reports the tasks that you didn't move out for monitoring).

-Tony

Thread

RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-01 21:10 +0100
  Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes David Carrillo-Cisneros <davidcc@google.com> - 2017-02-02 00:20 +0100
    RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-02 18:40 +0100
    RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-02 20:40 +0100
      RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Shivappa Vikas <vikas.shivappa@intel.com> - 2017-02-02 21:20 +0100
      Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes David Carrillo-Cisneros <davidcc@google.com> - 2017-02-02 21:30 +0100
        Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-03 00:50 +0100
          Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes David Carrillo-Cisneros <davidcc@google.com> - 2017-02-03 02:50 +0100
            Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes David Carrillo-Cisneros <davidcc@google.com> - 2017-02-03 03:20 +0100
              Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-03 19:00 +0100
                Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes David Carrillo-Cisneros <davidcc@google.com> - 2017-02-03 22:10 +0100
                Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-03 23:30 +0100
                Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Stephane Eranian <eranian@google.com> - 2017-02-07 09:10 +0100
                Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-07 20:10 +0100
                Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Stephane Eranian <eranian@google.com> - 2017-02-08 22:40 +0100
                Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Shivappa Vikas <vikas.shivappa@intel.com> - 2017-02-07 21:30 +0100
    RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-06 20:00 +0100
    RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-06 22:30 +0100
      RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Shivappa Vikas <vikas.shivappa@intel.com> - 2017-02-06 22:40 +0100
        Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes David Carrillo-Cisneros <davidcc@google.com> - 2017-02-06 22:50 +0100
      Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes David Carrillo-Cisneros <davidcc@google.com> - 2017-02-06 23:20 +0100
        RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Luck, Tony" <tony.luck@intel.com> - 2017-02-07 00:30 +0100
          Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes David Carrillo-Cisneros <davidcc@google.com> - 2017-02-07 01:40 +0100
  Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Andi Kleen <andi@firstfloor.org> - 2017-02-02 01:40 +0100
    Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Andi Kleen <andi@firstfloor.org> - 2017-02-02 02:20 +0100
    Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes David Carrillo-Cisneros <davidcc@google.com> - 2017-02-02 02:20 +0100
    RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes "Yu, Fenghua" <fenghua.yu@intel.com> - 2017-02-02 02:30 +0100
      RE: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Shivappa Vikas <vikas.shivappa@intel.com> - 2017-02-02 19:00 +0100

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