[PATCH 5.18 509/879] perf parse-events: Support different format of the topdown event name

[Greg Kroah-Hartman]

From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

[ Upstream commit e7d1374ed5cb346efd9b3df03814dbc0767adb4e ]

The evsel->name may have a different format for a topdown event, a pure
topdown name (e.g., topdown-fe-bound), or a PMU name + a topdown name
(e.g., cpu/topdown-fe-bound/). The cpu/topdown-fe-bound/ kind format
isn't supported by the arch_evlist__leader(). This format is a very
common format for a hybrid platform, which requires specifying the PMU
name for each event.

Without the patch,

  $ perf stat -e '{instructions,slots,cpu/topdown-fe-bound/}' -a sleep 1

   Performance counter stats for 'system wide':

       <not counted>      instructions
       <not counted>      slots
     <not supported>      cpu/topdown-fe-bound/

         1.003482041 seconds time elapsed

  Some events weren't counted. Try disabling the NMI watchdog:
          echo 0 > /proc/sys/kernel/nmi_watchdog
          perf stat ...
          echo 1 > /proc/sys/kernel/nmi_watchdog
  The events in group usually have to be from the same PMU. Try reorganizing the group.

With the patch,

  $ perf stat -e '{instructions,slots,cpu/topdown-fe-bound/}' -a sleep 1

  Performance counter stats for 'system wide':

         157,383,996      slots
          25,011,711      instructions
          27,441,686      cpu/topdown-fe-bound/

         1.003530890 seconds time elapsed

Fixes: bc355822f0d9623b ("perf parse-events: Move slots only with topdown")
Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Ian Rogers <irogers@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Xing Zhengjun <zhengjun.xing@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220518143900.1493980-4-kan.liang@xxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 tools/perf/arch/x86/util/evlist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/arch/x86/util/evlist.c b/tools/perf/arch/x86/util/evlist.c
index cfc208d71f00..75564a7df15b 100644
--- a/tools/perf/arch/x86/util/evlist.c
+++ b/tools/perf/arch/x86/util/evlist.c
@@ -36,7 +36,7 @@ struct evsel *arch_evlist__leader(struct list_head *list)
 				if (slots == first)
 					return first;
 			}
-			if (!strncasecmp(evsel->name, "topdown", 7))
+			if (strcasestr(evsel->name, "topdown"))
 				has_topdown = true;
 			if (slots && has_topdown)
 				return slots;
-- 
2.35.1