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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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18
tools/perf/builtin-stat.c
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@@ -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,