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Re: [PATCH 25/32] sched: introduce the finish_arch_pre_lock_switch() scheduler hook

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This hook is used in the following patch in the series to write to
PQR_ASSOC_MSR, a msr that is utilized both by CQM/CMT and by CAT.
Since CAT is not dependent on perf, I created this hook to start CQM
monitoring right after other events start while keeping it independent
of perf. The idea is to have future versions of CAT to also rely on
this hook.

On Fri, Apr 29, 2016 at 11:05 AM, David Carrillo-Cisneros
<davidcc@google.com> wrote:
> This hook is used in the following patch in the series to write to
> PQR_ASSOC_MSR, a msr that is utilized both by CQM/CMT and by CAT. Since CAT
> is not dependent on perf, I created this hook to start CQM monitoring right
> after other events start while keeping it independent of perf. The idea is
> to have future versions of CAT to also rely on this hook.
>
> On Fri, Apr 29, 2016 at 1:52 AM Peter Zijlstra <peterz@infradead.org> wrote:
>>
>> On Thu, Apr 28, 2016 at 09:43:31PM -0700, David Carrillo-Cisneros wrote:
>> > This hook allows architecture specific code to be called at the end of
>> > the task switch and after perf_events' context switch but before the
>> > scheduler lock is released.
>> >
>> > The specific use case in this series is to avoid multiple writes to a
>> > slow
>> > MSR until all functions which modify such register in task switch have
>> > finished.
>>
>> Yeah, no. This really need way more justification. Why can't you use the
>> regular perf sched-in stuff for CQM?

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[PATCH 00/32] 2nd Iteration of Cache QoS Monitoring support. David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 06:50 +0200
  [PATCH 01/32] perf/x86/intel/cqm: temporarily remove MBM from CQM and cleanup David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 06:50 +0200
    Re: [PATCH 01/32] perf/x86/intel/cqm: temporarily remove MBM from  CQM and cleanup Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2016-04-29 22:30 +0200
  [PATCH 24/32] perf/x86/intel/cqm: use PERF_INACTIVE_*_READ_* flags in CQM David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 06:50 +0200
  [PATCH 25/32] sched: introduce the finish_arch_pre_lock_switch() scheduler hook David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 06:50 +0200
    Re: [PATCH 25/32] sched: introduce the finish_arch_pre_lock_switch()  scheduler hook Peter Zijlstra <peterz@infradead.org> - 2016-04-29 11:00 +0200
      Re: [PATCH 25/32] sched: introduce the finish_arch_pre_lock_switch()  scheduler hook David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 20:50 +0200
        Re: [PATCH 25/32] sched: introduce the finish_arch_pre_lock_switch()  scheduler hook Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2016-04-29 22:30 +0200
          Re: [PATCH 25/32] sched: introduce the finish_arch_pre_lock_switch()  scheduler hook David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 23:00 +0200
  [PATCH 14/32] perf/x86/intel/cqm: add preallocation of anodes David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 06:50 +0200
  [PATCH 32/32] perf/stat: revamp error handling for snapshot and per_pkg events David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 06:50 +0200
  [PATCH 09/32] perf/x86/intel/cqm: add per-package RMIDs, data and locks David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 06:50 +0200
    Re: [PATCH 09/32] perf/x86/intel/cqm: add per-package RMIDs, data  and locks Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2016-04-29 23:00 +0200
  [PATCH 29/32] perf,perf/x86,perf/powerpc,perf/arm,perf/*: add int error return to pmu::read David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 06:50 +0200
  [PATCH 06/32] x86/intel,cqm: add CONFIG_INTEL_RDT configuration flag and refactor PQR David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 06:50 +0200
  [PATCH 15/32] perf/core: add hooks to expose architecture specific features in perf_cgroup David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 18/32] perf/x86/intel/cqm: use pmu::event_terminate David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 16/32] perf/x86/intel/cqm: add cgroup support David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 17/32] perf/core: adding pmu::event_terminate David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 05/32] perf/core: remove unused pmu->count David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 04/32] perf/x86/intel/cqm: make read of RMIDs per package (Temporal) David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 11/32] perf/x86/intel/cqm: (I)state and limbo prmids David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 12/32] perf/x86/intel/cqm: add per-package RMID rotation David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 08/32] perf/x86/intel/cqm: prepare for next patches David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
    Re: [PATCH 08/32] perf/x86/intel/cqm: prepare for next patches Peter Zijlstra <peterz@infradead.org> - 2016-04-29 11:20 +0200
  [PATCH 07/32] perf/x86/intel/cqm: separate CQM PMU's attributes from x86 PMU David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 19/32] perf/core: introduce PMU event flag PERF_CGROUP_NO_RECURSION David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  [PATCH 10/32] perf/x86/intel/cqm: basic RMID hierarchy with per package rmids David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 07:00 +0200
  Re: [PATCH 00/32] 2nd Iteration of Cache QoS Monitoring support. Vikas Shivappa <vikas.shivappa@linux.intel.com> - 2016-04-29 23:10 +0200
    Re: [PATCH 00/32] 2nd Iteration of Cache QoS Monitoring support. David Carrillo-Cisneros <davidcc@google.com> - 2016-04-29 23:20 +0200

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