Commit-ID: 8a850cadca0e387c87a0911a61e99fd66aeb57ec
Gitweb: http://git.kernel.org/tip/8a850cadca0e387c87a0911a61e99fd66aeb57ec
Author: Ingo Molnar <mingo@xxxxxxx>
AuthorDate: Thu, 28 Apr 2011 11:16:44 +0200
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Thu, 28 Apr 2011 08:39:33 +0200
perf event, x86: Use better stalled cycles metric
Use the UOPS_EXECUTED.*,c=1,i=1 event on Intel CPUs - it is a rather
good indicator of CPU execution stalls, more sensitive and more inclusive
than the 0xa2 resource stalls event (which does not count nearly as many
stall types).
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-7y40wib8n1eqio7hjpn2dsrm@xxxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
arch/x86/kernel/cpu/perf_event_intel.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 067a48b..1ea9422 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -1413,8 +1413,8 @@ static __init int intel_pmu_init(void)
x86_pmu.enable_all = intel_pmu_nhm_enable_all;
x86_pmu.extra_regs = intel_nehalem_extra_regs;
- /* Install the stalled-cycles event: 0xff: All reasons, 0xa2: Resource stalls */
- intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES] = 0xffa2;
+ /* Install the stalled-cycles event: UOPS_EXECUTED.CORE_ACTIVE_CYCLES,c=1,i=1 */
+ intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES] = 0x1803fb1;
if (ebx & 0x40) {
/*
--
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