Changing the default 'instructions' HW event for SandyBridge and
IvyBrige to use the available precise 'instructions' event.
The precise event is defined in Intel SDM as:
INST_RETIRED.ALL - Precise instruction retired event with HW to
reduce effect of PEBS shadow in IP distribution
for both SandyBridge and IvyBrige micro-archs. It allows to use
precise modifier on 'instructions' event on SandyBridge and
IvyBrige micro-archs which is not possible now.
Signed-off-by: Jiri Olsa <jo...@redhat.com>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Andi Kleen <a...@firstfloor.org>
Cc: David Ahern <dsah...@gmail.com>
Cc: Stephane Eranian <eran...@google.com>
---
arch/x86/kernel/cpu/perf_event_intel.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c
b/arch/x86/kernel/cpu/perf_event_intel.c
index 529c893..3bc3592 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -2104,6 +2104,9 @@ __init int intel_pmu_init(void)
/* UOPS_DISPATCHED.THREAD,c=1,i=1 to count stall cycles*/
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =
X86_CONFIG(.event=0xb1, .umask=0x01, .inv=1, .cmask=1);
+ /* INST_RETIRED.ALL to count precise instructions */
+ intel_perfmon_event_map[PERF_COUNT_HW_INSTRUCTIONS] =
+ X86_CONFIG(.event=0xc0, .umask=0x01);
pr_cont("SandyBridge events, ");
break;
@@ -2127,6 +2130,9 @@ __init int intel_pmu_init(void)
/* UOPS_ISSUED.ANY,c=1,i=1 to count stall cycles */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
X86_CONFIG(.event=0x0e, .umask=0x01, .inv=1, .cmask=1);
+ /* INST_RETIRED.ALL to count precise instructions */
+ intel_perfmon_event_map[PERF_COUNT_HW_INSTRUCTIONS] =
+ X86_CONFIG(.event=0xc0, .umask=0x01);
pr_cont("IvyBridge events, ");
break;
--
1.7.11.7
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