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| author | Ingo Molnar <mingo@elte.hu> | 2011-04-28 11:16:44 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-04-28 08:39:33 +0200 |
| commit | 8a850cadca0e387c87a0911a61e99fd66aeb57ec (patch) | |
| tree | 9a5de0cd113edde3dad5d6970818d03ce37c2060 /arch/x86/kernel/cpu/perf_event_intel.c | |
| parent | 9ceb1c3d1fe15c2f9b55eaa8978019ef0e0a06ac (diff) | |
| download | linux-8a850cadca0e387c87a0911a61e99fd66aeb57ec.tar.gz linux-8a850cadca0e387c87a0911a61e99fd66aeb57ec.tar.xz linux-8a850cadca0e387c87a0911a61e99fd66aeb57ec.zip | |
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>
Diffstat (limited to 'arch/x86/kernel/cpu/perf_event_intel.c')
| -rw-r--r-- | 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 067a48b13a76..1ea94224f62e 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) { /* |