Messages in this thread Patch in this message | | | Date | Thu, 28 Apr 2011 06:54:56 GMT | From | tip-bot for Ingo Molnar <> | Subject | [tip:perf/stat] perf event, x86: Use better stalled cycles metric |
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Commit-ID: 8a850cadca0e387c87a0911a61e99fd66aeb57ec Gitweb: http://git.kernel.org/tip/8a850cadca0e387c87a0911a61e99fd66aeb57ec Author: Ingo Molnar <mingo@elte.hu> AuthorDate: Thu, 28 Apr 2011 11:16:44 +0200 Committer: Ingo Molnar <mingo@elte.hu> 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@chello.nl> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/n/tip-7y40wib8n1eqio7hjpn2dsrm@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu> --- 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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