[PATCH v2 06/11] perf stat: introduce --ctl-fd[-ack] options

Alexey Budankov
2020-05-06T18:22:25Z

Introduce --ctl-fd[-ack] options to pass open file descriptors
numbers from command line.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
---
tools/perf/builtin-stat.c | 10 ++++++++++
tools/perf/util/stat.h | 2 ++
2 files changed, 12 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 5aab3ff1bbea..60c0d9521f74 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,
@@ -984,6 +986,10 @@ 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 ('e': enable events, 'd': disable events)"),
+ OPT_INTEGER(0, "ctl-fd-ack", &stat_config.ctl_fd_ack,
+ "Send control command completion ('a') to fd ack descriptor"),
OPT_END()
};

@@ -2180,6 +2186,8 @@ 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)
@@ -2199,6 +2207,8 @@ 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/stat.h b/tools/perf/util/stat.h
index 027b9dcd902f..0b0fa3a2cde2 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -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