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Date: Fri, 5 May 2023 09:44:52 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org
Subject: [PATCH] perf parse-events: Do not break up AUX event group
Assume AUX event group is correct and not do break it up.
Example:
Before:
$ perf record --no-bpf-event -c 10 -e '{intel_pt//,tlb_flush.stlb_any/aux-sample-size=8192/pp}:u' -- sleep 0.1
WARNING: events were regrouped to match PMUs
Cannot add AUX area sampling to a group leader
After:
$ perf record --no-bpf-event -c 10 -e '{intel_pt//,tlb_flush.stlb_any/aux-sample-size=8192/pp}:u' -- sleep 0.1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.078 MB perf.data ]
$ perf script -F-dso,+addr | grep -C5 tlb_flush.stlb_any | head -11
sleep 20444 [003] 7939.510243: 1 branches:uH: 7f5350cc82a2 dl_main+0x9a2 => 7f5350cb38f0 _dl_add_to_namespace_list+0x0
sleep 20444 [003] 7939.510243: 1 branches:uH: 7f5350cb3908 _dl_add_to_namespace_list+0x18 => 7f5350cbb080 rtld_mutex_dummy+0x0
sleep 20444 [003] 7939.510243: 1 branches:uH: 7f5350cc8350 dl_main+0xa50 => 0 [unknown]
sleep 20444 [003] 7939.510244: 1 branches:uH: 7f5350cc83ca dl_main+0xaca => 7f5350caeb60 _dl_process_pt_gnu_property+0x0
sleep 20444 [003] 7939.510245: 1 branches:uH: 7f5350caeb60 _dl_process_pt_gnu_property+0x0 => 0 [unknown]
sleep 20444 7939.510245: 10 tlb_flush.stlb_any/aux-sample-size=8192/pp: 0 7f5350caeb60 _dl_process_pt_gnu_property+0x0
sleep 20444 [003] 7939.510254: 1 branches:uH: 7f5350cc87fe dl_main+0xefe => 7f5350ccd240 strcmp+0x0
sleep 20444 [003] 7939.510254: 1 branches:uH: 7f5350cc8862 dl_main+0xf62 => 0 [unknown]
sleep 20444 [003] 7939.510255: 1 branches:uH: 7f5350cc9cdc dl_main+0x23dc => 0 [unknown]
sleep 20444 [003] 7939.510257: 1 branches:uH: 7f5350cc89f6 dl_main+0x10f6 => 7f5350cb9530 _dl_setup_hash+0x0
sleep 20444 [003] 7939.510257: 1 branches:uH: 7f5350cc8a2d dl_main+0x112d => 7f5350cb3990 _dl_new_object+0x0
Fixes: 347c2f0a0988 ("perf parse-events: Sort and group parsed events")
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
tools/perf/util/evsel.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 356c07f03be6..a34f61a5271d 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -828,7 +828,11 @@ bool evsel__name_is(struct evsel *evsel, const char *name)
const char *evsel__group_pmu_name(const struct evsel *evsel)
{
- const struct evsel *leader;
+ const struct evsel *leader = evsel__leader(evsel);
+
+ /* Never break AUX event groups */
+ if (evsel__is_aux_event(leader))
+ return leader->pmu_name;
/* If the pmu_name is set use it. pmu_name isn't set for CPU and software events. */
if (evsel->pmu_name)
@@ -837,15 +841,9 @@ const char *evsel__group_pmu_name(const struct evsel *evsel)
* Software events may be in a group with other uncore PMU events. Use
* the pmu_name of the group leader to avoid breaking the software event
* out of the group.
- *
- * Aux event leaders, like intel_pt, expect a group with events from
- * other PMUs, so substitute the AUX event's PMU in this case.
*/
- leader = evsel__leader(evsel);
- if ((evsel->core.attr.type == PERF_TYPE_SOFTWARE || evsel__is_aux_event(leader)) &&
- leader->pmu_name) {
+ if (evsel->core.attr.type == PERF_TYPE_SOFTWARE && leader->pmu_name)
return leader->pmu_name;
- }
return "cpu";
}
--
2.34.1
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