* [PATCH][perf/urgent] perf stat: Fix interval output values
@ 2016-02-03 7:43 Jiri Olsa
2016-02-04 8:00 ` [tip:perf/urgent] " tip-bot for Jiri Olsa
0 siblings, 1 reply; 2+ messages in thread
From: Jiri Olsa @ 2016-02-03 7:43 UTC (permalink / raw)
To: Arnaldo Carvalho de Melo
Cc: lkml, David Ahern, Ingo Molnar, Namhyung Kim, Peter Zijlstra,
Stephane Eranian, Andi Kleen
We broke interval data displays with commit:
3f416f22d1e2 perf stat: Do not clean event's private stats
This commit removed stats cleaning, which is important
for '-r' option to carry counters data over the whole
run. But it's necessary to clean it for interval mode,
otherwise the displayed value is avg of all previous
values.
Before:
$ perf stat -e cycles -a -I 1000 record
# time counts unit events
1.000240796 75,216,287 cycles
2.000512791 107,823,524 cycles
$ perf stat report
# time counts unit events
1.000240796 75,216,287 cycles
2.000512791 91,519,906 cycles
Now:
$ perf stat report
# time counts unit events
1.000240796 75,216,287 cycles
2.000512791 107,823,524 cycles
Notice the second value being bigger (91,.. < 107,..).
This could be easily verified by using perf script which
displays raw stat data:
$ perf script
CPU THREAD VAL ENA RUN TIME EVENT
0 -1 23855779 1000209530 1000209530 1000240796 cycles
1 -1 33340397 1000224964 1000224964 1000240796 cycles
2 -1 15835415 1000226695 1000226695 1000240796 cycles
3 -1 2184696 1000228245 1000228245 1000240796 cycles
0 -1 97014312 2000514533 2000514533 2000512791 cycles
1 -1 46121497 2000543795 2000543795 2000512791 cycles
2 -1 32269530 2000543566 2000543566 2000512791 cycles
3 -1 7634472 2000544108 2000544108 2000512791 cycles
The sum of the first 4 values is the first interval
aggregated value:
23855779 + 33340397 + 15835415 + 2184696 = 75,216,287
The sum of the second 4 values minus first value is
the second interval aggregated value:
97014312 + 46121497 + 32269530 + 7634472 - 75216287 = 107,823,524
Link: http://lkml.kernel.org/n/tip-4xawgmi82euqnq9t87l2l1in@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/util/stat.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index beeed0bd3bee..4d9b481cf3b6 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -311,6 +311,16 @@ int perf_stat_process_counter(struct perf_stat_config *config,
aggr->val = aggr->ena = aggr->run = 0;
+ /*
+ * We calculate counter's data every interval,
+ * and the display code shows ps->res_stats
+ * avg value. We need to zero the stats for
+ * interval mode, otherwise overall avg running
+ * averages will be shown for each interval.
+ */
+ if (config->interval)
+ init_stats(ps->res_stats);
+
if (counter->per_pkg)
zero_per_pkg(counter);
--
2.4.3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [tip:perf/urgent] perf stat: Fix interval output values
2016-02-03 7:43 [PATCH][perf/urgent] perf stat: Fix interval output values Jiri Olsa
@ 2016-02-04 8:00 ` tip-bot for Jiri Olsa
0 siblings, 0 replies; 2+ messages in thread
From: tip-bot for Jiri Olsa @ 2016-02-04 8:00 UTC (permalink / raw)
To: linux-tip-commits
Cc: mingo, namhyung, dsahern, ak, acme, hpa, eranian, linux-kernel,
tglx, jolsa, a.p.zijlstra
Commit-ID: 51fd2df1e882a3c2a3f4b6c9ff243a93c9046dba
Gitweb: http://git.kernel.org/tip/51fd2df1e882a3c2a3f4b6c9ff243a93c9046dba
Author: Jiri Olsa <jolsa@kernel.org>
AuthorDate: Wed, 3 Feb 2016 08:43:56 +0100
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 3 Feb 2016 19:39:52 -0300
perf stat: Fix interval output values
We broke interval data displays with commit:
3f416f22d1e2 ("perf stat: Do not clean event's private stats")
This commit removed stats cleaning, which is important for '-r' option
to carry counters data over the whole run. But it's necessary to clean
it for interval mode, otherwise the displayed value is avg of all
previous values.
Before:
$ perf stat -e cycles -a -I 1000 record
# time counts unit events
1.000240796 75,216,287 cycles
2.000512791 107,823,524 cycles
$ perf stat report
# time counts unit events
1.000240796 75,216,287 cycles
2.000512791 91,519,906 cycles
Now:
$ perf stat report
# time counts unit events
1.000240796 75,216,287 cycles
2.000512791 107,823,524 cycles
Notice the second value being bigger (91,.. < 107,..).
This could be easily verified by using perf script which displays raw
stat data:
$ perf script
CPU THREAD VAL ENA RUN TIME EVENT
0 -1 23855779 1000209530 1000209530 1000240796 cycles
1 -1 33340397 1000224964 1000224964 1000240796 cycles
2 -1 15835415 1000226695 1000226695 1000240796 cycles
3 -1 2184696 1000228245 1000228245 1000240796 cycles
0 -1 97014312 2000514533 2000514533 2000512791 cycles
1 -1 46121497 2000543795 2000543795 2000512791 cycles
2 -1 32269530 2000543566 2000543566 2000512791 cycles
3 -1 7634472 2000544108 2000544108 2000512791 cycles
The sum of the first 4 values is the first interval aggregated value:
23855779 + 33340397 + 15835415 + 2184696 = 75,216,287
The sum of the second 4 values minus first value is the second interval
aggregated value:
97014312 + 46121497 + 32269530 + 7634472 - 75216287 = 107,823,524
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1454485436-20639-1-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/stat.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 2b58edc..afb0c45 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -311,6 +311,16 @@ int perf_stat_process_counter(struct perf_stat_config *config,
aggr->val = aggr->ena = aggr->run = 0;
+ /*
+ * We calculate counter's data every interval,
+ * and the display code shows ps->res_stats
+ * avg value. We need to zero the stats for
+ * interval mode, otherwise overall avg running
+ * averages will be shown for each interval.
+ */
+ if (config->interval)
+ init_stats(ps->res_stats);
+
if (counter->per_pkg)
zero_per_pkg(counter);
^ permalink raw reply related [flat|nested] 2+ messages in thread
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