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

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Message-ID: <20170104103713.GH25813@worktop.programming.kicks-ass.net>
Date:   Wed, 4 Jan 2017 11:37:13 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Will Deacon <will.deacon@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, marc.zyngier@....com,
        mark.rutland@....com, kim.phillips@....com, alex.bennee@...aro.org,
        christoffer.dall@...aro.org, tglx@...utronix.de,
        alexander.shishkin@...ux.intel.com, robh@...nel.org,
        suzuki.poulose@....com, pawel.moll@....com,
        mathieu.poirier@...aro.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2
 Statistical Profiling Extension

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?