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

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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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