Commit 8a850cad authored by Ingo Molnar's avatar Ingo Molnar

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.orgSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 9ceb1c3d
...@@ -1413,8 +1413,8 @@ static __init int intel_pmu_init(void) ...@@ -1413,8 +1413,8 @@ static __init int intel_pmu_init(void)
x86_pmu.enable_all = intel_pmu_nhm_enable_all; x86_pmu.enable_all = intel_pmu_nhm_enable_all;
x86_pmu.extra_regs = intel_nehalem_extra_regs; x86_pmu.extra_regs = intel_nehalem_extra_regs;
/* Install the stalled-cycles event: 0xff: All reasons, 0xa2: Resource stalls */ /* Install the stalled-cycles event: UOPS_EXECUTED.CORE_ACTIVE_CYCLES,c=1,i=1 */
intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES] = 0xffa2; intel_perfmon_event_map[PERF_COUNT_HW_STALLED_CYCLES] = 0x1803fb1;
if (ebx & 0x40) { if (ebx & 0x40) {
/* /*
......
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