From: Andi Kleen Date: Fri, 4 Dec 2015 11:50:32 +0000 (-0800) Subject: perf/x86: Use INST_RETIRED.TOTAL_CYCLES_PS for cycles:pp for Skylake X-Git-Tag: v4.14-rc1~4090^2~12 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=442f5c74cbeaf54939980397ece59360c0a824e9;p=platform%2Fkernel%2Flinux-rpi.git perf/x86: Use INST_RETIRED.TOTAL_CYCLES_PS for cycles:pp for Skylake I added UOPS_RETIRED.ALL by mistake to the Skylake PEBS event list for cycles:pp. But the event is not documented for Skylake, and has some issues. The recommended replacement for cycles:pp is to use INST_RETIRED.ANY+pebs as a base, similar to what CPUs before Sandy Bridge did. This new event is called INST_RETIRED.TOTAL_CYCLES_PS. The event is not really new, but has been already used by perf before Sandy Bridge for the original cycles:p Note the SDM doesn't document that event either, but it's being documented in the latest version of the event list on: https://download.01.org/perfmon/SKL This patch does: - Remove UOPS_RETIRED.ALL from the Skylake PEBS event list - Add INST_RETIRED.ANY to the Skylake PEBS event list, and an table entry to allow cmask=16,inv=1 for cycles:pp - We don't need an extra entry for the base INST_RETIRED event, because it is already covered by the catch-all PEBS table entry. - Switch Skylake to use the Core2 PEBS alias (which is INST_RETIRED.TOTAL_CYCLES_PS) Signed-off-by: Andi Kleen Signed-off-by: Peter Zijlstra (Intel) Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Thomas Gleixner Cc: Vince Weaver Cc: hpa@zytor.com Link: http://lkml.kernel.org/r/1448929689-13771-1-git-send-email-andi@firstfloor.org Signed-off-by: Ingo Molnar --- diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c index 33b4b67..5ed6e0d 100644 --- a/arch/x86/kernel/cpu/perf_event_intel.c +++ b/arch/x86/kernel/cpu/perf_event_intel.c @@ -3521,7 +3521,7 @@ __init int intel_pmu_init(void) x86_pmu.event_constraints = intel_skl_event_constraints; x86_pmu.pebs_constraints = intel_skl_pebs_event_constraints; x86_pmu.extra_regs = intel_skl_extra_regs; - x86_pmu.pebs_aliases = intel_pebs_aliases_snb; + x86_pmu.pebs_aliases = intel_pebs_aliases_core2; /* all extra regs are per-cpu when HT is on */ x86_pmu.flags |= PMU_FL_HAS_RSP_1; x86_pmu.flags |= PMU_FL_NO_HT_SHARING; diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c index cd1993e..56b5015 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c @@ -718,9 +718,8 @@ struct event_constraint intel_hsw_pebs_event_constraints[] = { struct event_constraint intel_skl_pebs_event_constraints[] = { INTEL_FLAGS_UEVENT_CONSTRAINT(0x1c0, 0x2), /* INST_RETIRED.PREC_DIST */ - INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_NA(0x01c2, 0xf), /* UOPS_RETIRED.ALL */ - /* UOPS_RETIRED.ALL, inv=1, cmask=16 (cycles:p). */ - INTEL_FLAGS_EVENT_CONSTRAINT(0x108001c2, 0xf), + /* INST_RETIRED.TOTAL_CYCLES_PS (inv=1, cmask=16) (cycles:p). */ + INTEL_FLAGS_EVENT_CONSTRAINT(0x108000c0, 0x0f), INTEL_PLD_CONSTRAINT(0x1cd, 0xf), /* MEM_TRANS_RETIRED.* */ INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_LD(0x11d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_LOADS */ INTEL_FLAGS_UEVENT_CONSTRAINT_DATALA_ST(0x12d0, 0xf), /* MEM_INST_RETIRED.STLB_MISS_STORES */