linux-kernel - [tip:perf/urgent] perf/x86: Honor the architectural performance monitoring version

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Message-ID: <tip-2c33645d366d13b969d936b68b9f4875b1fdddea@git.kernel.org>
Date:	Fri, 19 Jun 2015 10:58:55 -0700
From:	"tip-bot for Palik, Imre" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	luto@...capital.net, paulus@...ba.org,
	torvalds@...ux-foundation.org, hpa@...or.com, oleg@...hat.com,
	akpm@...ux-foundation.org, brgerst@...il.com, imrep@...zon.de,
	mingo@...nel.org, acme@...nel.org, aliguori@...zon.com,
	tglx@...utronix.de, peterz@...radead.org, dvlasenk@...hat.com,
	linux-kernel@...r.kernel.org, bp@...en8.de
Subject: [tip:perf/urgent] perf/x86:
  Honor the architectural performance monitoring version

Commit-ID:  2c33645d366d13b969d936b68b9f4875b1fdddea
Gitweb:     http://git.kernel.org/tip/2c33645d366d13b969d936b68b9f4875b1fdddea
Author:     Palik, Imre <imrep@...zon.de>
AuthorDate: Mon, 8 Jun 2015 14:46:49 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 19 Jun 2015 09:38:48 +0200

perf/x86: Honor the architectural performance monitoring version

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 try 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 2
and above.

(Some of the ideas in this patch came from Peter Zijlstra.)

Signed-off-by: Imre Palik <imrep@...zon.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Anthony Liguori <aliguori@...zon.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brian Gerst <brgerst@...il.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1433767609-1039-1-git-send-email-imrep.amz@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/perf_event_intel.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index afdd7c0..2813ea0 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -3324,13 +3324,13 @@ __init int intel_pmu_init(void)
 		 * counter, so do not extend mask to generic counters
 		 */
 		for_each_event_constraint(c, x86_pmu.event_constraints) {
-			if (c->cmask != FIXED_EVENT_FLAGS
-			    || c->idxmsk64 == INTEL_PMC_MSK_FIXED_REF_CYCLES) {
-				continue;
+			if (c->cmask == FIXED_EVENT_FLAGS
+			    && c->idxmsk64 != INTEL_PMC_MSK_FIXED_REF_CYCLES) {
+				c->idxmsk64 |= (1ULL << x86_pmu.num_counters) - 1;
 			}
-
-			c->idxmsk64 |= (1ULL << x86_pmu.num_counters) - 1;
-			c->weight += x86_pmu.num_counters;
+			c->idxmsk64 &=
+				~(~0UL << (INTEL_PMC_IDX_FIXED + x86_pmu.num_counters_fixed));
+			c->weight = hweight64(c->idxmsk64);
 		}
 	}
 
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