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Message-Id: <20220406072839.107519-3-florian.fischer@muhq.space>
Date: Wed, 6 Apr 2022 09:28:37 +0200
From: Florian Fischer <florian.fischer@...q.space>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Florian Schmaus <flow@...fau.de>,
Florian Fischer <florian.fischer@...q.space>
Subject: [PATCH v2 2/4] perf stat: add rusage utime and stime events
It bothered me that during benchmarking using perf stat (to collect
for example CPU cache events) I could not simultaneously retrieve the
times spend in user or kernel mode in a machine readable format.
When running perf stat the output for humans contains the times
reported by rusage and wait4.
$ perf stat -e cache-misses:u -- true
Performance counter stats for 'true':
4,206 cache-misses:u
0.001113619 seconds time elapsed
0.001175000 seconds user
0.000000000 seconds sys
But perf stat's machine-readable format does not provide this information.
$ perf stat -x, -e cache-misses:u -- true
4282,,cache-misses:u,492859,100.00,,
I found no way to retrieve this information using the available events
while using machine-readable output.
This patch adds two new tool internal events 'rusage_user_time'
and 'rusage_system_time' as well as their aliases 'ru_utime' and
'ru_stime', similarly to the already present 'duration_time' event.
Both events use the already collected rusage information obtained by wait4
and tracked in the global ru_stats.
Examples presenting cache-misses and rusage information in both human and
machine-readable form:
$ ./perf stat -e duration_time,ru_utime,ru_stime,cache-misses -- grep -q -r duration_time .
Performance counter stats for 'grep -q -r duration_time .':
67,422,542 ns duration_time:u
50,517 us ru_utime:u
16,839 us ru_stime:u
30,937 cache-misses:u
0.067422542 seconds time elapsed
0.050517000 seconds user
0.016839000 seconds sys
$ ./perf stat -x, -e duration_time,ru_utime,ru_stime,cache-misses -- grep -q -r duration_time .
72134524,ns,duration_time:u,72134524,100.00,,
65225,us,ru_utime:u,65225,100.00,,
6865,us,ru_stime:u,6865,100.00,,
38705,,cache-misses:u,71189328,100.00,,
Signed-off-by: Florian Fischer <florian.fischer@...q.space>
---
tools/perf/builtin-stat.c | 36 ++++++++++++++++++++++++++--------
tools/perf/util/evsel.h | 3 +++
tools/perf/util/parse-events.l | 2 ++
3 files changed, 33 insertions(+), 8 deletions(-)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 61faffb535f5..c73afc8f6da5 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -342,15 +342,35 @@ static int evsel__write_stat_event(struct evsel *counter, int cpu_map_idx, u32 t
static int read_single_counter(struct evsel *counter, int cpu_map_idx,
int thread, struct timespec *rs)
{
- if (counter->tool_event == PERF_TOOL_DURATION_TIME) {
- u64 val = rs->tv_nsec + rs->tv_sec*1000000000ULL;
- struct perf_counts_values *count =
- perf_counts(counter->counts, cpu_map_idx, thread);
- count->ena = count->run = val;
- count->val = val;
- return 0;
+ switch(counter->tool_event) {
+ case PERF_TOOL_DURATION_TIME: {
+ u64 val = rs->tv_nsec + rs->tv_sec*1000000000ULL;
+ struct perf_counts_values *count =
+ perf_counts(counter->counts, cpu_map_idx, thread);
+ count->ena = count->run = val;
+ count->val = val;
+ return 0;
+ }
+ case PERF_TOOL_RU_UTIME:
+ case PERF_TOOL_RU_STIME: {
+ u64 val;
+ struct perf_counts_values *count =
+ perf_counts(counter->counts, cpu_map_idx, thread);
+ if (counter->tool_event == PERF_TOOL_RU_UTIME)
+ val = ru_stats.ru_utime_usec_stat.mean;
+ else
+ val = ru_stats.ru_stime_usec_stat.mean;
+ count->ena = count->run = val;
+ count->val = val;
+ return 0;
+ }
+ default:
+ case PERF_TOOL_NONE:
+ return evsel__read_counter(counter, cpu_map_idx, thread);
+ case PERF_TOOL_LAST:
+ /* this case should never be reached */
+ return 0;
}
- return evsel__read_counter(counter, cpu_map_idx, thread);
}
/*
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 041b42d33bf5..e89b1224ae61 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -30,6 +30,9 @@ typedef int (evsel__sb_cb_t)(union perf_event *event, void *data);
enum perf_tool_event {
PERF_TOOL_NONE = 0,
PERF_TOOL_DURATION_TIME = 1,
+ PERF_TOOL_RU_UTIME = 2,
+ PERF_TOOL_RU_STIME = 3,
+ PERF_TOOL_LAST
};
/** struct evsel - event selector
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 5b6e4b5249cf..3c7227b8035c 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -353,6 +353,8 @@ alignment-faults { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_AL
emulation-faults { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_EMULATION_FAULTS); }
dummy { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_DUMMY); }
duration_time { return tool(yyscanner, PERF_TOOL_DURATION_TIME); }
+rusage_user_time|ru_utime { return tool(yyscanner, PERF_TOOL_RU_UTIME); }
+rusage_system_time|ru_stime { return tool(yyscanner, PERF_TOOL_RU_STIME); }
bpf-output { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_BPF_OUTPUT); }
cgroup-switches { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_CGROUP_SWITCHES); }
--
2.35.1
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