From: Kan Liang kan.liang@linux.intel.com
The hard-coded metrics is wrongly calculated on the hybrid machine.
$ perf stat -e cycles,instructions -a sleep 1
Performance counter stats for 'system wide':
18,205,487 cpu_atom/cycles/ 9,733,603 cpu_core/cycles/ 9,423,111 cpu_atom/instructions/ # 0.52 insn per cycle 4,268,965 cpu_core/instructions/ # 0.23 insn per cycle
The insn per cycle for cpu_core should be 4,268,965 / 9,733,603 = 0.44.
When finding the metric events, the find_stat() doesn't take the PMU type into account. The cpu_atom/cycles/ is wrongly used to calculate the IPC of the cpu_core.
Fixes: 0a57b910807a ("perf stat: Use counts rather than saved_value") Reported-by: "Khalil, Amiri" amiri.khalil@intel.com Signed-off-by: Kan Liang kan.liang@linux.intel.com Cc: stable@vger.kernel.org --- tools/perf/util/stat-shadow.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c index 3466aa952442..4d0edc061f1a 100644 --- a/tools/perf/util/stat-shadow.c +++ b/tools/perf/util/stat-shadow.c @@ -176,6 +176,10 @@ static double find_stat(const struct evsel *evsel, int aggr_idx, enum stat_type if (type != evsel__stat_type(cur)) continue;
+ /* Ignore if not the PMU we're looking for. */ + if (evsel->pmu != cur->pmu) + continue; + aggr = &cur->stats->aggr[aggr_idx]; if (type == STAT_NSECS) return aggr->counts.val;