From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964928AbdADKh3 (ORCPT ); Wed, 4 Jan 2017 05:37:29 -0500 Received: from merlin.infradead.org ([205.233.59.134]:38352 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964797AbdADKh1 (ORCPT ); Wed, 4 Jan 2017 05:37:27 -0500 Date: Wed, 4 Jan 2017 11:37:13 +0100 From: Peter Zijlstra To: Will Deacon Cc: linux-arm-kernel@lists.infradead.org, marc.zyngier@arm.com, mark.rutland@arm.com, kim.phillips@arm.com, alex.bennee@linaro.org, christoffer.dall@linaro.org, tglx@linutronix.de, alexander.shishkin@linux.intel.com, robh@kernel.org, suzuki.poulose@arm.com, pawel.moll@arm.com, mathieu.poirier@linaro.org, mingo@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 09/10] drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension Message-ID: <20170104103713.GH25813@worktop.programming.kicks-ass.net> References: <1483467027-14547-1-git-send-email-will.deacon@arm.com> <1483467027-14547-10-git-send-email-will.deacon@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1483467027-14547-10-git-send-email-will.deacon@arm.com> User-Agent: Mutt/1.5.22.1 (2013-10-16) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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?