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perf stat: extend -D,--delay option with -1 value

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Extend -D,--delay option with -1 value to start monitoring with
events disabled to be enabled later by enable command provided
via control file descriptor.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/81ac633c-a844-5cfb-931c-820f6e6cbd12@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Alexey Budankov 2020-07-17 10:04:33 +03:00 committed by Arnaldo Carvalho de Melo
parent 987b823813
commit 2162b9c6bd
4 changed files with 21 additions and 7 deletions
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5
tools/perf/Documentation/perf-stat.txt
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@ -238,8 +238,9 @@ mode, use --per-node in addition to -a. (system-wide).
-D msecs::
--delay msecs::
After starting the program, wait msecs before measuring. This is useful to
filter out the startup phase of the program, which is often very different.
After starting the program, wait msecs before measuring (-1: start with events
disabled). This is useful to filter out the startup phase of the program,
which is often very different.
-T::
--transaction::

18
tools/perf/builtin-stat.c
View File

@ -487,16 +487,26 @@ static bool handle_interval(unsigned int interval, int *times)
static void enable_counters(void)
{
if (stat_config.initial_delay)
if (stat_config.initial_delay < 0) {
pr_info(EVLIST_DISABLED_MSG);
return;
}
if (stat_config.initial_delay > 0) {
pr_info(EVLIST_DISABLED_MSG);
usleep(stat_config.initial_delay * USEC_PER_MSEC);
}
/*
* We need to enable counters only if:
* - we don't have tracee (attaching to task or cpu)
* - we have initial delay configured
*/
if (!target__none(&target) || stat_config.initial_delay)
if (!target__none(&target) || stat_config.initial_delay) {
evlist__enable(evsel_list);
if (stat_config.initial_delay > 0)
pr_info(EVLIST_ENABLED_MSG);
}
}
static void disable_counters(void)
@ -1053,8 +1063,8 @@ static struct option stat_options[] = {
"aggregate counts per thread", AGGR_THREAD),
OPT_SET_UINT(0, "per-node", &stat_config.aggr_mode,
"aggregate counts per numa node", AGGR_NODE),
OPT_UINTEGER('D', "delay", &stat_config.initial_delay,
"ms to wait before starting measurement after program start"),
OPT_INTEGER('D', "delay", &stat_config.initial_delay,
"ms to wait before starting measurement after program start (-1: start with events disabled)"),
OPT_CALLBACK_NOOPT(0, "metric-only", &stat_config.metric_only, NULL,
"Only print computed metrics. No raw values", enable_metric_only),
OPT_BOOLEAN(0, "metric-no-group", &stat_config.metric_no_group,

3
tools/perf/util/evlist.h
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@ -378,4 +378,7 @@ int evlist__finalize_ctlfd(struct evlist *evlist);
bool evlist__ctlfd_initialized(struct evlist *evlist);
int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd);
#define EVLIST_ENABLED_MSG "Events enabled\n"
#define EVLIST_DISABLED_MSG "Events disabled\n"
#endif /* __PERF_EVLIST_H */

2
tools/perf/util/stat.h
View File

@ -116,7 +116,7 @@ struct perf_stat_config {
FILE *output;
unsigned int interval;
unsigned int timeout;
unsigned int initial_delay;
int initial_delay;
unsigned int unit_width;
unsigned int metric_only_len;
int times;