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Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension

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On Tue, Jan 03, 2017 at 06:10:26PM +0000, Will Deacon wrote:
> The ARMv8.2 architecture introduces the Statistical Profiling Extension
> (SPE). SPE provides a way to configure and collect profiling samples
> from the CPU in the form of a trace buffer, which can be mapped directly
> into userspace using the perf AUX buffer infrastructure.
> 
> This patch adds support for SPE in the form of a new perf driver.
> 

Can you give a little high level overview of what exactly SPE is?

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[RFC PATCH 00/10] Add support for the ARMv8.2 Statistical Profiling Extension Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100
  [RFC PATCH 02/10] arm64: cpufeature: Don't enforce system-wide SPE capability Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100
    Re: [RFC PATCH 02/10] arm64: cpufeature: Don't enforce system-wide  SPE capability Mark Rutland <mark.rutland@arm.com> - 2017-01-04 12:10 +0100
  [RFC PATCH 05/10] genirq: export irq_get_percpu_devid_partition to modules Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100
  [RFC PATCH 01/10] arm64: cpufeature: allow for version discrepancy in PMU implementations Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100
    Re: [RFC PATCH 01/10] arm64: cpufeature: allow for version  discrepancy in PMU implementations Mark Rutland <mark.rutland@arm.com> - 2017-01-04 11:30 +0100
  [RFC PATCH 04/10] arm64: head.S: Enable EL1 (host) access to SPE when entered at EL2 Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100
  [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100
    Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2  Statistical Profiling Extension Peter Zijlstra <peterz@infradead.org> - 2017-01-04 11:40 +0100
      Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2  Statistical Profiling Extension Will Deacon <will.deacon@arm.com> - 2017-01-04 20:20 +0100
        Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2  Statistical Profiling Extension Peter Zijlstra <peterz@infradead.org> - 2017-01-05 12:40 +0100
    Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2  Statistical Profiling Extension Kim Phillips <kim.phillips@arm.com> - 2017-01-10 23:10 +0100
      Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2  Statistical Profiling Extension Will Deacon <will.deacon@arm.com> - 2017-01-11 13:40 +0100
        Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2  Statistical Profiling Extension Kim Phillips <kim.phillips@arm.com> - 2017-01-11 22:10 +0100
          Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2  Statistical Profiling Extension Will Deacon <will.deacon@arm.com> - 2017-01-13 14:40 +0100
      Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2  Statistical Profiling Extension Marc Zyngier <marc.zyngier@arm.com> - 2017-01-12 12:40 +0100
  [RFC PATCH 07/10] perf: Directly pass PERF_AUX_* flags to perf_aux_output_end Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100
  [RFC PATCH 03/10] arm64: KVM: Save/restore the host SPE state when entering/leaving a VM Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100
  [RFC PATCH 10/10] dt-bindings: Document devicetree binding for ARM SPE Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100
  [RFC PATCH 08/10] perf/core: Add PERF_AUX_FLAG_COLLISION to report colliding samples Will Deacon <will.deacon@arm.com> - 2017-01-03 19:20 +0100

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