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

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Date:   Wed, 6 May 2020 21:22:19 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 06/11] perf stat: introduce --ctl-fd[-ack] options


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

Signed-off-by: Alexey Budankov <alexey.budankov@...ux.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