From: Thomas Gleixner <tglx@linutronix.de>
To: David Carrillo-Cisneros <davidcc@google.com>
Cc: Shivappa Vikas <vikas.shivappa@intel.com>,
Vikas Shivappa <vikas.shivappa@linux.intel.com>,
Stephane Eranian <eranian@google.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>,
hpa@zytor.com, Ingo Molnar <mingo@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Shankar, Ravi V" <ravi.v.shankar@intel.com>,
"Luck, Tony" <tony.luck@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>,
andi.kleen@intel.com, "H. Peter Anvin" <h.peter.anvin@intel.com>
Subject: Re: [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes
Date: Fri, 20 Jan 2017 09:30:00 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.20.1701200924250.3602@nanos> (raw)
In-Reply-To: <CALcN6mjaO0Hnuiu-98JzMBUytRiOCODMvm-uLFOrO=gO4PS9BQ@mail.gmail.com>
On Thu, 19 Jan 2017, David Carrillo-Cisneros wrote:
> On Thu, Jan 19, 2017 at 9:41 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
> > Above you are talking about the same CLOSID and different RMIDS and not
> > about changing both.
>
> The scenario I talked about implies changing CLOSID without affecting
> monitoring.
> It happens when the allocation needs for a thread/cgroup/CPU change
> dynamically. Forcing to change the RMID together with the CLOSID would
> give wrong monitoring values unless the old RMID is kept around until
> becomes free, which is ugly and would waste a RMID.
When the allocation needs for a resource control group change, then we
simply update the allocation constraints of that group without chaning the
CLOSID. So everything just stays the same.
If you move entities to a different group then of course the CLOSID
changes and then it's a different story how to deal with monitoring.
> > To gather any useful information for both CPU1 and T1 you need TWO
> > RMIDs. Everything else is voodoo and crystal ball analysis and we are not
> > going to support that.
> >
>
> Correct. Yet, having two RMIDs to monitor the same task/cgroup/CPU
> just because the CLOSID changed is wasteful.
Again, the CLOSID only changes if you move entities to a different resource
control group and in that case the RMID change is the least of your worries.
> Correct. But there may not be a fixed CLOSID association if loads
> exhibit dynamic behavior and/or system load changes dynamically.
So, you really want to move entities around between resource control groups
dynamically? I'm not seing why you would want to do that, but I'm all ear
to get educated on that.
Thanks,
tglx
next prev parent reply other threads:[~2017-01-20 8:30 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-06 21:59 [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Vikas Shivappa
2017-01-06 21:59 ` [PATCH 01/12] Documentation, x86/cqm: Intel Resource Monitoring Documentation Vikas Shivappa
2017-01-06 21:59 ` [PATCH 02/12] x86/cqm: Remove cqm recycling/conflict handling Vikas Shivappa
2017-01-06 21:59 ` [PATCH 03/12] x86/rdt: Add rdt common/cqm compile option Vikas Shivappa
2017-01-16 18:05 ` Thomas Gleixner
2017-01-17 17:25 ` Shivappa Vikas
2017-01-06 21:59 ` [PATCH 04/12] x86/cqm: Add Per pkg rmid support Vikas Shivappa
2017-01-16 18:15 ` [PATCH 04/12] x86/cqm: Add Per pkg rmid support\ Thomas Gleixner
2017-01-17 19:11 ` Shivappa Vikas
2017-01-06 21:59 ` [PATCH 05/12] x86/cqm,perf/core: Cgroup support prepare Vikas Shivappa
2017-01-17 12:11 ` Thomas Gleixner
2017-01-17 12:31 ` Peter Zijlstra
2017-01-18 2:14 ` Shivappa Vikas
2017-01-17 13:46 ` Thomas Gleixner
2017-01-17 20:22 ` Shivappa Vikas
2017-01-17 21:31 ` Thomas Gleixner
2017-01-17 15:26 ` Peter Zijlstra
2017-01-17 20:27 ` Shivappa Vikas
2017-01-06 21:59 ` [PATCH 06/12] x86/cqm: Add cgroup hierarchical monitoring support Vikas Shivappa
2017-01-17 14:07 ` Thomas Gleixner
2017-01-06 22:00 ` [PATCH 07/12] x86/rdt,cqm: Scheduling support update Vikas Shivappa
2017-01-17 21:58 ` Thomas Gleixner
2017-01-17 22:30 ` Shivappa Vikas
2017-01-06 22:00 ` [PATCH 08/12] x86/cqm: Add support for monitoring task and cgroup together Vikas Shivappa
2017-01-17 16:11 ` Thomas Gleixner
2017-01-06 22:00 ` [PATCH 09/12] x86/cqm: Add RMID reuse Vikas Shivappa
2017-01-17 16:59 ` Thomas Gleixner
2017-01-18 0:26 ` Shivappa Vikas
2017-01-06 22:00 ` [PATCH 10/12] perf/core,x86/cqm: Add read for Cgroup events,per pkg reads Vikas Shivappa
2017-01-06 22:00 ` [PATCH 11/12] perf/stat: fix bug in handling events in error state Vikas Shivappa
2017-01-06 22:00 ` [PATCH 12/12] perf/stat: revamp read error handling, snapshot and per_pkg events Vikas Shivappa
2017-01-17 17:31 ` [PATCH 00/12] Cqm2: Intel Cache quality monitoring fixes Thomas Gleixner
2017-01-18 2:38 ` Shivappa Vikas
2017-01-18 8:53 ` Thomas Gleixner
2017-01-18 9:56 ` Peter Zijlstra
2017-01-19 19:59 ` Shivappa Vikas
2017-01-18 19:41 ` Shivappa Vikas
2017-01-18 21:03 ` David Carrillo-Cisneros
2017-01-19 17:41 ` Thomas Gleixner
2017-01-20 7:37 ` David Carrillo-Cisneros
2017-01-20 8:30 ` Thomas Gleixner [this message]
2017-01-20 20:27 ` David Carrillo-Cisneros
2017-01-18 21:16 ` Yu, Fenghua
2017-01-19 2:09 ` David Carrillo-Cisneros
2017-01-19 16:58 ` David Carrillo-Cisneros
2017-01-19 17:54 ` Thomas Gleixner
2017-01-19 2:21 ` Vikas Shivappa
2017-01-19 6:45 ` Stephane Eranian
2017-01-19 18:03 ` Thomas Gleixner
2017-01-20 2:32 ` Vikas Shivappa
2017-01-20 7:58 ` David Carrillo-Cisneros
2017-01-20 13:28 ` Thomas Gleixner
2017-01-20 20:11 ` David Carrillo-Cisneros
2017-01-20 21:08 ` Shivappa Vikas
2017-01-20 21:44 ` David Carrillo-Cisneros
2017-01-20 23:51 ` Shivappa Vikas
2017-02-08 10:13 ` Peter Zijlstra
2017-01-23 9:47 ` Thomas Gleixner
2017-01-23 11:30 ` Peter Zijlstra
2017-02-01 20:08 ` Luck, Tony
2017-02-01 23:12 ` David Carrillo-Cisneros
2017-02-02 17:39 ` Luck, Tony
2017-02-02 19:33 ` Luck, Tony
2017-02-02 20:20 ` Shivappa Vikas
2017-02-02 20:22 ` David Carrillo-Cisneros
2017-02-02 23:41 ` Luck, Tony
2017-02-03 1:40 ` David Carrillo-Cisneros
2017-02-03 2:14 ` David Carrillo-Cisneros
2017-02-03 17:52 ` Luck, Tony
2017-02-03 21:08 ` David Carrillo-Cisneros
2017-02-03 22:24 ` Luck, Tony
2017-02-07 8:08 ` Stephane Eranian
2017-02-07 18:52 ` Luck, Tony
2017-02-08 19:31 ` Stephane Eranian
2017-02-07 20:10 ` Shivappa Vikas
2017-02-17 13:41 ` Thomas Gleixner
2017-02-06 18:54 ` Luck, Tony
2017-02-06 21:22 ` Luck, Tony
2017-02-06 21:36 ` Shivappa Vikas
2017-02-06 21:46 ` David Carrillo-Cisneros
2017-02-06 22:16 ` David Carrillo-Cisneros
2017-02-06 23:27 ` Luck, Tony
2017-02-07 0:33 ` David Carrillo-Cisneros
2017-02-02 0:35 ` Andi Kleen
2017-02-02 1:12 ` David Carrillo-Cisneros
2017-02-02 1:19 ` Andi Kleen
2017-02-02 1:22 ` Yu, Fenghua
2017-02-02 17:51 ` Shivappa Vikas
2017-02-08 10:11 ` Peter Zijlstra
2017-01-20 20:40 ` Shivappa Vikas
2017-01-20 19:31 ` Stephane Eranian
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