From: David Ahern <dsah...@gmail.com>
Add option to allow user to control analysis window. e.g., collect data
for some amount of time and analyze a segment of interest within that
window.
Signed-off-by: David Ahern <dsah...@gmail.com>
---
tools/perf/Documentation/perf-script.txt | 7 +++++++
tools/perf/builtin-script.c | 15 ++++++++++++++-
2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/tools/perf/Documentation/perf-script.txt
b/tools/perf/Documentation/perf-script.txt
index 0f6ee09f7256..5dc5c6a09ac4 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -292,6 +292,13 @@ include::itrace.txt[]
--force::
Don't do ownership validation.
+--time::
+ Only analyze samples within given time window: <start>,<stop>. Times
+ have the format seconds.microseconds. If start is not given (i.e., time
+ string is ',x.y') then analysis starts at the beginning of the file. If
+ stop time is not given (i.e, time string is 'x.y,') then analysis goes
+ to end of file.
+
SEE ALSO
--------
linkperf:perf-record[1], linkperf:perf-script-perl[1],
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 066b4bf73780..52d6a020346a 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -22,6 +22,7 @@
#include "util/thread_map.h"
#include "util/stat.h"
#include "util/thread-stack.h"
+#include "util/time-utils.h"
#include <linux/bitmap.h>
#include <linux/stringify.h>
#include <linux/time64.h>
@@ -833,6 +834,8 @@ struct perf_script {
struct cpu_map *cpus;
struct thread_map *threads;
int name_width;
+ const char *time_str;
+ struct perf_time ptime;
};
static int perf_evlist__max_name_len(struct perf_evlist *evlist)
@@ -1014,6 +1017,9 @@ static int process_sample_event(struct perf_tool *tool,
struct perf_script *scr = container_of(tool, struct perf_script, tool);
struct addr_location al;
+ if (perf_time__skip_sample(&scr->ptime, sample->time))
+ return 0;
+
if (debug_mode) {
if (sample->time < last_timestamp) {
pr_err("Samples misordered, previous: %" PRIu64
@@ -2186,7 +2192,8 @@ int cmd_script(int argc, const char **argv, const char
*prefix __maybe_unused)
"Enable symbol demangling"),
OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
"Enable kernel symbol demangling"),
-
+ OPT_STRING(0, "time", &script.time_str, "str",
+ "Time span of interest (start,stop)"),
OPT_END()
};
const char * const script_subcommands[] = { "record", "report", NULL };
@@ -2465,6 +2472,12 @@ int cmd_script(int argc, const char **argv, const char
*prefix __maybe_unused)
if (err < 0)
goto out_delete;
+ /* needs to be parsed after looking up reference time */
+ if (perf_time__parse_str(&script.ptime, script.time_str) != 0) {
+ pr_err("Invalid time string\n");
+ return -EINVAL;
+ }
+
err = __cmd_script(&script);
flush_scripting();
--
2.7.4 (Apple Git-66)
