From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753956AbaBQOqa (ORCPT ); Mon, 17 Feb 2014 09:46:30 -0500 Received: from merlin.infradead.org ([205.233.59.134]:43524 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752537AbaBQOq2 (ORCPT ); Mon, 17 Feb 2014 09:46:28 -0500 Date: Mon, 17 Feb 2014 15:46:17 +0100 From: Peter Zijlstra To: Alexander Shishkin Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Frederic Weisbecker , Mike Galbraith , Paul Mackerras , Stephane Eranian , Andi Kleen , Adrian Hunter , Matt Fleming Subject: Re: [PATCH v1 07/11] x86: perf: intel_pt: Intel PT PMU driver Message-ID: <20140217144617.GT27965@twins.programming.kicks-ass.net> References: <1391683834-29868-1-git-send-email-alexander.shishkin@linux.intel.com> <1391683834-29868-8-git-send-email-alexander.shishkin@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1391683834-29868-8-git-send-email-alexander.shishkin@linux.intel.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 06, 2014 at 12:50:30PM +0200, Alexander Shishkin wrote: > Add support for Intel Processor Trace (PT) to kernel's perf/itrace events. > PT is an extension of Intel Architecture that collects information about > software execuction such as control flow, execution modes and timings and > formats it into highly compressed binary packets. Even being compressed, > these packets are generated at hundreds of megabytes per second per core, > which makes it impractical to decode them on the fly in the kernel. Thus, > buffers containing this binary stream are zero-copy mapped to the debug > tools in userspace for subsequent decoding and analysis. > > Signed-off-by: Alexander Shishkin > --- > arch/x86/include/uapi/asm/msr-index.h | 18 + > arch/x86/kernel/cpu/Makefile | 1 + > arch/x86/kernel/cpu/intel_pt.h | 127 ++++ > arch/x86/kernel/cpu/perf_event.c | 4 + > arch/x86/kernel/cpu/perf_event_intel.c | 10 + > arch/x86/kernel/cpu/perf_event_intel_pt.c | 991 ++++++++++++++++++++++++++++++ > 6 files changed, 1151 insertions(+) > create mode 100644 arch/x86/kernel/cpu/intel_pt.h > create mode 100644 arch/x86/kernel/cpu/perf_event_intel_pt.c Andi said that when itrace is enabled the LBR is wrecked; this patch seems to fail to deal with that.