Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758693Ab3EWNiW (ORCPT ); Thu, 23 May 2013 09:38:22 -0400 Received: from mail-ob0-f171.google.com ([209.85.214.171]:52068 "EHLO mail-ob0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758020Ab3EWNiV (ORCPT ); Thu, 23 May 2013 09:38:21 -0400 MIME-Version: 1.0 In-Reply-To: <1369203761-12649-5-git-send-email-khandual@linux.vnet.ibm.com> References: <1369203761-12649-1-git-send-email-khandual@linux.vnet.ibm.com> <1369203761-12649-5-git-send-email-khandual@linux.vnet.ibm.com> Date: Thu, 23 May 2013 15:38:20 +0200 Message-ID: Subject: Re: [PATCH 4/5] x86, perf: Add conditional branch filtering support From: Stephane Eranian To: Anshuman Khandual Cc: Linux PPC dev , LKML , Michael Ellerman , Michael Neuling , Peter Zijlstra , "ak@linux.intel.com" , Ingo Molnar Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2212 Lines: 56 On Wed, May 22, 2013 at 8:22 AM, Anshuman Khandual wrote: > From: Peter Zijlstra > > This patch adds conditional branch filtering support, > enabling it for PERF_SAMPLE_BRANCH_COND in perf branch > stack sampling framework by utilizing an available > software filter X86_BR_JCC. > Reviewed-by: Stephane Eranian > Signed-off-by: Peter Zijlstra > Signed-off-by: Anshuman Khandual > --- > arch/x86/kernel/cpu/perf_event_intel_lbr.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/x86/kernel/cpu/perf_event_intel_lbr.c b/arch/x86/kernel/cpu/perf_event_intel_lbr.c > index d978353..a0d6387 100644 > --- a/arch/x86/kernel/cpu/perf_event_intel_lbr.c > +++ b/arch/x86/kernel/cpu/perf_event_intel_lbr.c > @@ -337,6 +337,10 @@ static int intel_pmu_setup_sw_lbr_filter(struct perf_event *event) > > if (br_type & PERF_SAMPLE_BRANCH_IND_CALL) > mask |= X86_BR_IND_CALL; > + > + if (br_type & PERF_SAMPLE_BRANCH_COND) > + mask |= X86_BR_JCC; > + > /* > * stash actual user request into reg, it may > * be used by fixup code for some CPU > @@ -626,6 +630,7 @@ static const int nhm_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = { > * NHM/WSM erratum: must include IND_JMP to capture IND_CALL > */ > [PERF_SAMPLE_BRANCH_IND_CALL] = LBR_IND_CALL | LBR_IND_JMP, > + [PERF_SAMPLE_BRANCH_COND] = LBR_JCC, > }; > > static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = { > @@ -637,6 +642,7 @@ static const int snb_lbr_sel_map[PERF_SAMPLE_BRANCH_MAX] = { > [PERF_SAMPLE_BRANCH_ANY_CALL] = LBR_REL_CALL | LBR_IND_CALL > | LBR_FAR, > [PERF_SAMPLE_BRANCH_IND_CALL] = LBR_IND_CALL, > + [PERF_SAMPLE_BRANCH_COND] = LBR_JCC, > }; > > /* core */ > -- > 1.7.11.7 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/