From: kan.liang@linux.intel.com
To: acme@kernel.org, mingo@redhat.com, irogers@google.com,
jolsa@kernel.org, namhyung@kernel.org,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org
Cc: peterz@infradead.org, zhengjun.xing@linux.intel.com,
adrian.hunter@intel.com, ak@linux.intel.com, eranian@google.com,
Kan Liang <kan.liang@linux.intel.com>
Subject: [PATCH V3 3/4] perf parse-events: Support different format of the topdown event name
Date: Wed, 18 May 2022 07:38:59 -0700 [thread overview]
Message-ID: <20220518143900.1493980-4-kan.liang@linux.intel.com> (raw)
In-Reply-To: <20220518143900.1493980-1-kan.liang@linux.intel.com>
From: Kan Liang <kan.liang@linux.intel.com>
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: bc355822f0d9 ("perf parse-events: Move slots only with topdown")
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---
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
next prev parent reply other threads:[~2022-05-18 14:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-18 14:38 [PATCH V3 0/4] Several perf metrics topdown related fixes kan.liang
2022-05-18 14:38 ` [PATCH V3 1/4] perf evsel: Fixes topdown events in a weak group for the hybrid platform kan.liang
2022-05-19 4:31 ` Ian Rogers
2022-05-18 14:38 ` [PATCH V3 2/4] perf stat: Always keep perf metrics topdown events in a group kan.liang
2022-05-19 4:26 ` Ian Rogers
2022-05-18 14:38 ` kan.liang [this message]
2022-05-18 14:39 ` [PATCH V3 4/4] perf parse-events: Move slots event for the hybrid platform too kan.liang
2022-05-20 14:15 ` [PATCH V3 0/4] Several perf metrics topdown related fixes Arnaldo Carvalho de Melo
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