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Message-Id: <20241221192654.94344-3-irogers@google.com>
Date: Sat, 21 Dec 2024 11:26:52 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>,
Ze Gao <zegao2021@...il.com>, Weilin Wang <weilin.wang@...el.com>,
Dominique Martinet <asmadeus@...ewreck.org>,
Jean-Philippe Romain <jean-philippe.romain@...s.st.com>, Junhao He <hejunhao3@...wei.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
bpf@...r.kernel.org, Aditya Bodkhe <Aditya.Bodkhe1@....com>
Cc: Leo Yan <leo.yan@....com>, Atish Patra <atishp@...osinc.com>
Subject: [PATCH v3 2/4] perf stat: Fix find_stat for mixed legacy/non-legacy events
Legacy events typically don't have a PMU when added leading to
mismatched legacy/non-legacy cases in find_stat. Use evsel__find_pmu
to make sure the evsel PMU is looked up. Update the evsel__find_pmu
code to look for the PMU using the extended config type or, for legacy
hardware/hw_cache events on non-hybrid systems, just use the core PMU.
Before:
```
$ perf stat -e cycles,cpu/instructions/ -a sleep 1
Performance counter stats for 'system wide':
215,309,764 cycles
44,326,491 cpu/instructions/
1.002555314 seconds time elapsed
```
After:
```
$ perf stat -e cycles,cpu/instructions/ -a sleep 1
Performance counter stats for 'system wide':
990,676,332 cycles
1,235,762,487 cpu/instructions/ # 1.25 insn per cycle
1.002667198 seconds time elapsed
```
Fixes: 3612ca8e2935 ("perf stat: Fix the hard-coded metrics
calculation on the hybrid")
Signed-off-by: Ian Rogers <irogers@...gle.com>
Tested-by: James Clark <james.clark@...aro.org>
Tested-by: Leo Yan <leo.yan@....com>
Tested-by: Atish Patra <atishp@...osinc.com>
---
tools/perf/util/pmus.c | 20 +++++++++++++++++---
tools/perf/util/stat-shadow.c | 3 ++-
2 files changed, 19 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index b493da0d22ef..60d81d69503e 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -710,11 +710,25 @@ char *perf_pmus__default_pmu_name(void)
struct perf_pmu *evsel__find_pmu(const struct evsel *evsel)
{
struct perf_pmu *pmu = evsel->pmu;
+ bool legacy_core_type;
- if (!pmu) {
- pmu = perf_pmus__find_by_type(evsel->core.attr.type);
- ((struct evsel *)evsel)->pmu = pmu;
+ if (pmu)
+ return pmu;
+
+ pmu = perf_pmus__find_by_type(evsel->core.attr.type);
+ legacy_core_type =
+ evsel->core.attr.type == PERF_TYPE_HARDWARE ||
+ evsel->core.attr.type == PERF_TYPE_HW_CACHE;
+ if (!pmu && legacy_core_type) {
+ if (perf_pmus__supports_extended_type()) {
+ u32 type = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT;
+
+ pmu = perf_pmus__find_by_type(type);
+ } else {
+ pmu = perf_pmus__find_core_pmu();
+ }
}
+ ((struct evsel *)evsel)->pmu = pmu;
return pmu;
}
diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 47718610d5d8..109c4a012ce8 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -151,6 +151,7 @@ static double find_stat(const struct evsel *evsel, int aggr_idx, enum stat_type
{
struct evsel *cur;
int evsel_ctx = evsel_context(evsel);
+ struct perf_pmu *evsel_pmu = evsel__find_pmu(evsel);
evlist__for_each_entry(evsel->evlist, cur) {
struct perf_stat_aggr *aggr;
@@ -177,7 +178,7 @@ static double find_stat(const struct evsel *evsel, int aggr_idx, enum stat_type
* Except the SW CLOCK events,
* ignore if not the PMU we're looking for.
*/
- if ((type != STAT_NSECS) && (evsel->pmu != cur->pmu))
+ if ((type != STAT_NSECS) && (evsel_pmu != evsel__find_pmu(cur)))
continue;
aggr = &cur->stats->aggr[aggr_idx];
--
2.47.1.613.gc27f4b7a9f-goog
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