Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423374AbbFEP3H (ORCPT ); Fri, 5 Jun 2015 11:29:07 -0400 Received: from mail-wi0-f176.google.com ([209.85.212.176]:38040 "EHLO mail-wi0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752962AbbFEP3E (ORCPT ); Fri, 5 Jun 2015 11:29:04 -0400 From: Imre Palik To: Peter Zijlstra Cc: Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo , Thomas Gleixner , "H. Peter Anvin" , x86@kernel.org, linux-kernel@vger.kernel.org, "Palik, Imre" , Anthony Liguori Subject: [PATCH v2] perf: honoring the architectural performance monitoring version Date: Fri, 5 Jun 2015 17:28:45 +0200 Message-Id: <1433518125-27169-1-git-send-email-imrep.amz@gmail.com> X-Mailer: git-send-email 1.7.9.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2035 Lines: 54 From: "Palik, Imre" Architectural performance monitoring version 1 doesn't support fixed counters. Currently, even if a hypervisor advertises support for architectural performance monitoring version 1, perf may still tries to use the fixed counters, as the constraints are set up based on the CPU model. This patch ensures that perf honors the architectural performance monitoring version returned by CPUID, and it only uses the fixed counters for version two and above. Some of the ideas in this patch are coming from Peter Zijlstra. Signed-off-by: Imre Palik Cc: Anthony Liguori --- arch/x86/kernel/cpu/perf_event_intel.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c index 3998131..bde66aa 100644 --- a/arch/x86/kernel/cpu/perf_event_intel.c +++ b/arch/x86/kernel/cpu/perf_event_intel.c @@ -1870,7 +1870,7 @@ x86_get_event_constraints(struct cpu_hw_events *cpuc, int idx, for_each_event_constraint(c, x86_pmu.event_constraints) { if ((event->hw.config & c->cmask) == c->code) { event->hw.flags |= c->flags; - return c; + return c->idxmsk64 ? c : NULL; } } } @@ -3341,9 +3341,12 @@ __init int intel_pmu_init(void) for_each_event_constraint(c, x86_pmu.event_constraints) { if (c->cmask != FIXED_EVENT_FLAGS || c->idxmsk64 == INTEL_PMC_MSK_FIXED_REF_CYCLES) { + c->idxmsk64 &= + ~(~0UL << (INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed)); continue; } - + c->idxmsk64 &= + ~(~0UL << (INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed)); c->idxmsk64 |= (1ULL << x86_pmu.num_counters) - 1; c->weight += x86_pmu.num_counters; } -- 1.7.9.5 -- 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/