From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932818AbaICO7q (ORCPT ); Wed, 3 Sep 2014 10:59:46 -0400 Received: from mail-wg0-f44.google.com ([74.125.82.44]:56784 "EHLO mail-wg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932641AbaICO7n (ORCPT ); Wed, 3 Sep 2014 10:59:43 -0400 From: Stephane Eranian To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, mingo@elte.hu, acme@redhat.com, jolsa@redhat.com, namhyung@kernel.org, dsahern@gmail.com Subject: [PATCH v4 2/6] perf/x86: add support for sampling PEBS machine state registers Date: Wed, 3 Sep 2014 16:59:07 +0200 Message-Id: <1409756351-25743-3-git-send-email-eranian@google.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1409756351-25743-1-git-send-email-eranian@google.com> References: <1409756351-25743-1-git-send-email-eranian@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PEBS can capture machine state regs at retiremnt of the sampled instructions. When precise sampling is enabled on an event, PEBS is used, so substitute the interrupted state with the PEBS state. Note that not all registers are captured by PEBS. Those missing are replaced by the interrupt state counter-parts. Signed-off-by: Stephane Eranian --- arch/x86/kernel/cpu/perf_event_intel_ds.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c index 9dc4199..139a8a5 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c @@ -886,6 +886,23 @@ static void __intel_pmu_pebs_event(struct perf_event *event, regs.bp = pebs->bp; regs.sp = pebs->sp; + if (sample_type & PERF_SAMPLE_REGS_INTR) { + regs.ax = pebs->ax; + regs.bx = pebs->bx; + regs.cx = pebs->cx; + regs.si = pebs->si; + regs.di = pebs->di; + + regs.r8 = pebs->r8; + regs.r9 = pebs->r9; + regs.r10 = pebs->r10; + regs.r11 = pebs->r11; + regs.r12 = pebs->r12; + regs.r13 = pebs->r13; + regs.r14 = pebs->r14; + regs.r14 = pebs->r15; + } + if (event->attr.precise_ip > 1 && x86_pmu.intel_cap.pebs_format >= 2) { regs.ip = pebs->real_ip; regs.flags |= PERF_EFLAGS_EXACT; -- 1.7.9.5