From: Andi Kleen Date: Sat, 27 Feb 2016 00:27:56 +0000 (-0800) Subject: perf stat: Check existence of frontend/backed stalled cycles X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9dec4473abe7967c204fe700baf5344ade34e9c8;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git perf stat: Check existence of frontend/backed stalled cycles Only put the frontend/backend stalled cycles into the default perf stat events when the CPU actually supports them. This avoids empty columns with --metric-only on newer Intel CPUs. Committer note: Before: $ perf stat ls Performance counter stats for 'ls': 1.080893 task-clock (msec) # 0.619 CPUs utilized 0 context-switches # 0.000 K/sec 0 cpu-migrations # 0.000 K/sec 97 page-faults # 0.090 M/sec 3,327,741 cycles # 3.079 GHz stalled-cycles-frontend stalled-cycles-backend 1,609,544 instructions # 0.48 insn per cycle 319,117 branches # 295.235 M/sec 12,246 branch-misses # 3.84% of all branches 0.001746508 seconds time elapsed $ After: $ perf stat ls Performance counter stats for 'ls': 0.693948 task-clock (msec) # 0.662 CPUs utilized 0 context-switches # 0.000 K/sec 0 cpu-migrations # 0.000 K/sec 95 page-faults # 0.137 M/sec 1,792,509 cycles # 2.583 GHz 1,599,047 instructions # 0.89 insn per cycle 316,328 branches # 455.838 M/sec 12,453 branch-misses # 3.94% of all branches 0.001048987 seconds time elapsed $ Signed-off-by: Andi Kleen Acked-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: Stephane Eranian Link: http://lkml.kernel.org/r/1456532881-26621-2-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 8c0bc0fe5179..24f222dd2a8a 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -1441,7 +1441,7 @@ static int perf_stat_init_aggr_mode_file(struct perf_stat *st) */ static int add_default_attributes(void) { - struct perf_event_attr default_attrs[] = { + struct perf_event_attr default_attrs0[] = { { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK }, { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES }, @@ -1449,8 +1449,14 @@ static int add_default_attributes(void) { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS }, { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES }, +}; + struct perf_event_attr frontend_attrs[] = { { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND }, +}; + struct perf_event_attr backend_attrs[] = { { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND }, +}; + struct perf_event_attr default_attrs1[] = { { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS }, { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS }, { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES }, @@ -1567,7 +1573,19 @@ static int add_default_attributes(void) } if (!evsel_list->nr_entries) { - if (perf_evlist__add_default_attrs(evsel_list, default_attrs) < 0) + if (perf_evlist__add_default_attrs(evsel_list, default_attrs0) < 0) + return -1; + if (pmu_have_event("cpu", "stalled-cycles-frontend")) { + if (perf_evlist__add_default_attrs(evsel_list, + frontend_attrs) < 0) + return -1; + } + if (pmu_have_event("cpu", "stalled-cycles-backend")) { + if (perf_evlist__add_default_attrs(evsel_list, + backend_attrs) < 0) + return -1; + } + if (perf_evlist__add_default_attrs(evsel_list, default_attrs1) < 0) return -1; }