linux-kernel - [tip:perf/urgent] perf/x86/intel: Use proper dTLB-load-misses event on IvyBridge

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Date:	Wed, 16 Jul 2014 12:19:25 -0700
From:	tip-bot for Vince Weaver <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	torvalds@...ux-foundation.org, peterz@...radead.org,
	acme@...nel.org, vincent.weaver@...ne.edu, tglx@...utronix.de
Subject: [tip:perf/urgent] perf/x86/intel:
  Use proper dTLB-load-misses event on IvyBridge

Commit-ID:  1996388e9f4e3444db8273bc08d25164d2967c21
Gitweb:     http://git.kernel.org/tip/1996388e9f4e3444db8273bc08d25164d2967c21
Author:     Vince Weaver <vincent.weaver@...ne.edu>
AuthorDate: Mon, 14 Jul 2014 15:33:25 -0400
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 16 Jul 2014 13:18:40 +0200

perf/x86/intel: Use proper dTLB-load-misses event on IvyBridge

This was discussed back in February:

	https://lkml.org/lkml/2014/2/18/956

But I never saw a patch come out of it.

On IvyBridge we share the SandyBridge cache event tables, but the
dTLB-load-miss event is not compatible.  Patch it up after
the fact to the proper DTLB_LOAD_MISSES.DEMAND_LD_MISS_CAUSES_A_WALK

Signed-off-by: Vince Weaver <vincent.weaver@...ne.edu>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1407141528200.17214@vincent-weaver-1.umelst.maine.edu
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/cpu/perf_event_intel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 07846d7..c206815 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -2474,6 +2474,9 @@ __init int intel_pmu_init(void)
 	case 62: /* IvyBridge EP */
 		memcpy(hw_cache_event_ids, snb_hw_cache_event_ids,
 		       sizeof(hw_cache_event_ids));
+		/* dTLB-load-misses on IVB is different than SNB */
+		hw_cache_event_ids[C(DTLB)][C(OP_READ)][C(RESULT_MISS)] = 0x8108; /* DTLB_LOAD_MISSES.DEMAND_LD_MISS_CAUSES_A_WALK */
+
 		memcpy(hw_cache_extra_regs, snb_hw_cache_extra_regs,
 		       sizeof(hw_cache_extra_regs));
 
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