This is a note to let you know that I've just added the patch titled
perf/x86: Blacklist all MEM_*_RETIRED events for Ivy Bridge
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-x86-blacklist-all-mem_-_retired-events-for-ivy-bridge.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 741a698f420c34c458294a6accecfbad702a7c52 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Date: Fri, 3 May 2013 14:11:23 +0200
Subject: perf/x86: Blacklist all MEM_*_RETIRED events for Ivy Bridge
From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
commit 741a698f420c34c458294a6accecfbad702a7c52 upstream.
Errata BV98 states that all MEM_*_RETIRED events corrupt the
counter value of the SMT sibling's counters. Blacklist these
events
Reported-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: eranian@xxxxxxxxxx
Link: http://lkml.kernel.org/r/20130503121256.083340271@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-jwra43mujrv1oq9xk6mfe57v@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/perf_event_intel.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -125,10 +125,15 @@ static struct event_constraint intel_ivb
INTEL_UEVENT_CONSTRAINT(0x08a3, 0x4), /* CYCLE_ACTIVITY.CYCLES_L1D_PENDING */
INTEL_UEVENT_CONSTRAINT(0x0ca3, 0x4), /* CYCLE_ACTIVITY.STALLS_L1D_PENDING */
INTEL_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PREC_DIST */
- INTEL_EVENT_CONSTRAINT(0xd0, 0xf), /* MEM_UOPS_RETIRED.* */
- INTEL_EVENT_CONSTRAINT(0xd1, 0xf), /* MEM_LOAD_UOPS_RETIRED.* */
- INTEL_EVENT_CONSTRAINT(0xd2, 0xf), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */
- INTEL_EVENT_CONSTRAINT(0xd3, 0xf), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */
+ /*
+ * Errata BV98 -- MEM_*_RETIRED events can leak between counters of SMT
+ * siblings; disable these events because they can corrupt unrelated
+ * counters.
+ */
+ INTEL_EVENT_CONSTRAINT(0xd0, 0x0), /* MEM_UOPS_RETIRED.* */
+ INTEL_EVENT_CONSTRAINT(0xd1, 0x0), /* MEM_LOAD_UOPS_RETIRED.* */
+ INTEL_EVENT_CONSTRAINT(0xd2, 0x0), /* MEM_LOAD_UOPS_LLC_HIT_RETIRED.* */
+ INTEL_EVENT_CONSTRAINT(0xd3, 0x0), /* MEM_LOAD_UOPS_LLC_MISS_RETIRED.* */
EVENT_CONSTRAINT_END
};
Patches currently in stable-queue which might be from a.p.zijlstra@xxxxxxxxx are
queue-3.9/perf-x86-intel-add-support-for-ivybridge-model-58-uncore.patch
queue-3.9/perf-x86-intel-fix-unintended-variable-name-reuse.patch
queue-3.9/perf-x86-intel-lbr-demand-proper-privileges-for-perf_sample_branch_kernel.patch
queue-3.9/perf-x86-intel-lbr-fix-lbr-filter.patch
queue-3.9/perf-x86-blacklist-all-mem_-_retired-events-for-ivy-bridge.patch
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