[PATCH 11/13] perf stat: Clear sample_(type|period) for counting

From: Arnaldo Carvalho de Melo
Date: Thu Nov 26 2015 - 15:47:19 EST


From: Jiri Olsa <jolsa@xxxxxxxxxx>

Clear sample_(type|period) for counting, as it only confuses debug
output with unwanted sampling details:

Before:

$ sudo perf stat -e 'raw_syscalls:sys_enter' -vv ls
------------------------------------------------------------
perf_event_attr:
type 2
size 112
config 0x11
{ sample_period, sample_freq } 1
sample_type TIME|CPU|PERIOD|RAW
read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
disabled 1
inherit 1
enable_on_exec 1
exclude_guest 1
...

After:
$ sudo perf stat -e 'raw_syscalls:sys_enter' -vv ls
------------------------------------------------------------
perf_event_attr:
type 2
size 112
config 0x11
read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING
disabled 1
inherit 1
enable_on_exec 1
exclude_guest 1
...

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1448465815-27404-1-git-send-email-jolsa@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/builtin-stat.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index e77880b5094d..df2fbf046ee2 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -161,6 +161,13 @@ static int create_perf_stat_counter(struct perf_evsel *evsel)

attr->inherit = !no_inherit;

+ /*
+ * Some events get initialized with sample_(period/type) set,
+ * like tracepoints. Clear it up for counting.
+ */
+ attr->sample_period = 0;
+ attr->sample_type = 0;
+
if (target__has_cpu(&target))
return perf_evsel__open_per_cpu(evsel, perf_evsel__cpus(evsel));

--
2.1.0

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