[PATCH 31/32] perf script: Remove the time slices number limitation

From: Arnaldo Carvalho de Melo
Date: Wed Jan 17 2018 - 11:14:25 EST


From: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>

Previously it was only allowed to use at most 10 time slices in 'perf
script --time'.

This patch removes this limitation.
For example, following command line is OK (12 time slices)

perf script --time 1%/1,1%/2,1%/3,1%/4,1%/5,1%/6,1%/7,1%/8,1%/9,1%/10,1%/11,1%/12

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
Suggested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Reviewed-by: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1515596433-24653-9-git-send-email-yao.jin@xxxxxxxxxxxxxxx
[ No need to check for NULL to call free, use zfree ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/perf/Documentation/perf-script.txt | 10 +++++-----
tools/perf/builtin-script.c | 16 ++++++++++++----
2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 806ec6391fd6..7730c1d2b5d3 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -351,19 +351,19 @@ include::itrace.txt[]
to end of file.

Also support time percent with multipe time range. Time string is
- 'a%/n,b%/m,...' or 'a%-b%,c%-%d,...'. The maximum number of slices is 10.
+ 'a%/n,b%/m,...' or 'a%-b%,c%-%d,...'.

For example:
- Select the second 10% time slice
+ Select the second 10% time slice:
perf script --time 10%/2

- Select from 0% to 10% time slice
+ Select from 0% to 10% time slice:
perf script --time 0%-10%

- Select the first and second 10% time slices
+ Select the first and second 10% time slices:
perf script --time 10%/1,10%/2

- Select from 0% to 10% and 30% to 40% slices
+ Select from 0% to 10% and 30% to 40% slices:
perf script --time 0%-10%,30%-40%

--max-blocks::
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index ac781916e51e..3499d68e1d70 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1480,8 +1480,6 @@ static int perf_sample__fprintf_synth(struct perf_sample *sample,
return 0;
}

-#define PTIME_RANGE_MAX 10
-
struct perf_script {
struct perf_tool tool;
struct perf_session *session;
@@ -1496,7 +1494,8 @@ struct perf_script {
struct thread_map *threads;
int name_width;
const char *time_str;
- struct perf_time_interval ptime_range[PTIME_RANGE_MAX];
+ struct perf_time_interval *ptime_range;
+ int range_size;
int range_num;
};

@@ -3445,6 +3444,13 @@ int cmd_script(int argc, const char **argv)
if (err < 0)
goto out_delete;

+ script.ptime_range = perf_time__range_alloc(script.time_str,
+ &script.range_size);
+ if (!script.ptime_range) {
+ err = -ENOMEM;
+ goto out_delete;
+ }
+
/* needs to be parsed after looking up reference time */
if (perf_time__parse_str(script.ptime_range, script.time_str) != 0) {
if (session->evlist->first_sample_time == 0 &&
@@ -3457,7 +3463,7 @@ int cmd_script(int argc, const char **argv)
}

script.range_num = perf_time__percent_parse_str(
- script.ptime_range, PTIME_RANGE_MAX,
+ script.ptime_range, script.range_size,
script.time_str,
session->evlist->first_sample_time,
session->evlist->last_sample_time);
@@ -3476,6 +3482,8 @@ int cmd_script(int argc, const char **argv)
flush_scripting();

out_delete:
+ zfree(&script.ptime_range);
+
perf_evlist__free_stats(session->evlist);
perf_session__delete(session);

--
2.14.3