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Subject[PATCH v1 3/8] perf stat: introduce control descriptors and --ctl-fd[-ack] options
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Introduce control file descriptors and --ctl-fd[-ack] options to pass
control descriptors from command line. Extend --delay option with -1
value to start collection in paused mode to be resumed later by resume
command provided via control file descriptor.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
tools/perf/builtin-stat.c | 28 ++++++++++++++++++++++++----
tools/perf/util/evlist.h | 3 +++
tools/perf/util/stat.h | 4 +++-
3 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index ec053dc1e35c..0a1b79fd3f48 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -187,6 +187,8 @@ static struct perf_stat_config stat_config = {
.metric_only_len = METRIC_ONLY_LEN,
.walltime_nsecs_stats = &walltime_nsecs_stats,
.big_num = true,
+ .ctl_fd = -1,
+ .ctl_fd_ack = -1
};

static inline void diff_timespec(struct timespec *r, struct timespec *a,
@@ -373,16 +375,26 @@ static void process_interval(void)

static void enable_counters(void)
{
- if (stat_config.initial_delay)
+ if (stat_config.initial_delay < 0) {
+ pr_info(PERF_EVLIST__PAUSED_MSG);
+ return;
+ }
+
+ if (stat_config.initial_delay > 0) {
+ pr_info(PERF_EVLIST__PAUSED_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(PERF_EVLIST__RESUMED_MSG);
+ }
}

static void disable_counters(void)
@@ -912,8 +924,8 @@ 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 paused"),
OPT_CALLBACK_NOOPT(0, "metric-only", &stat_config.metric_only, NULL,
"Only print computed metrics. No raw values", enable_metric_only),
OPT_BOOLEAN(0, "topdown", &topdown_run,
@@ -933,6 +945,10 @@ static struct option stat_options[] = {
"Use with 'percore' event qualifier to show the event "
"counts of one hardware thread by sum up total hardware "
"threads of same physical core"),
+ OPT_INTEGER(0, "ctl-fd", &stat_config.ctl_fd,
+ "Listen on fd descriptor for command to control measurement ('r': resume, 'p': pause)"),
+ OPT_INTEGER(0, "ctl-fd-ack", &stat_config.ctl_fd_ack,
+ "Send control command completion ('a') to fd ack descriptor"),
OPT_END()
};

@@ -2129,6 +2145,8 @@ int cmd_stat(int argc, const char **argv)
signal(SIGALRM, skip_signal);
signal(SIGABRT, skip_signal);

+ perf_evlist__initialize_ctlfd(evsel_list, stat_config.ctl_fd, stat_config.ctl_fd_ack);
+
status = 0;
for (run_idx = 0; forever || run_idx < stat_config.run_count; run_idx++) {
if (stat_config.run_count != 1 && verbose > 0)
@@ -2148,6 +2166,8 @@ int cmd_stat(int argc, const char **argv)
if (!forever && status != -1 && !interval)
print_counters(NULL, argc, argv);

+ perf_evlist__finalize_ctlfd(evsel_list);
+
if (STAT_RECORD) {
/*
* We synthesize the kernel mmap record just so that older tools
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index a94b2993fafc..c91368483074 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -369,6 +369,9 @@ enum evlist_ctl_cmd {
CTL_CMD_ACK = 'a'
};

+#define PERF_EVLIST__RESUMED_MSG "Monitoring resumed\n"
+#define PERF_EVLIST__PAUSED_MSG "Monitoring paused\n"
+
int perf_evlist__initialize_ctlfd(struct evlist *evlist, int ctl_fd, int ctl_fd_ack);
int perf_evlist__finalize_ctlfd(struct evlist *evlist);
int perf_evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd);
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index b4fdfaa7f2c0..0b0fa3a2cde2 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -113,7 +113,7 @@ 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;
@@ -130,6 +130,8 @@ struct perf_stat_config {
struct perf_cpu_map *cpus_aggr_map;
u64 *walltime_run;
struct rblist metric_events;
+ int ctl_fd;
+ int ctl_fd_ack;
};

void update_stats(struct stats *stats, u64 val);
--
2.24.1

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