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Subject[PATCH 1/7] perf, tools, stat: Check existence of frontend/backed stalled cycles
Date
From: Andi Kleen <ak@linux.intel.com>

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.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
tools/perf/builtin-stat.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 8c0bc0f..24f222d 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;
}

--
2.5.0
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