linux-kernel - [PATCH v3 8/9] perf record: implement control commands handling

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Message-ID: <25f98682-5ef2-4257-f302-93b29da707a9@linux.intel.com>
Date:   Wed, 13 May 2020 11:04:25 +0300
From:   Alexey Budankov <alexey.budankov@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, 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 v3 8/9] perf record: implement control commands handling


Implement handling of 'enable' and 'disable' control commands
coming from control file descriptor.

Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
---
 tools/perf/builtin-record.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 50dc2fe626e5..72f388623364 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1505,6 +1505,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 	bool disabled = false, draining = false;
 	int fd;
 	float ratio = 0;
+	enum evlist_ctl_cmd cmd = EVLIST_CTL_CMD_UNSUPPORTED;
 
 	atexit(record__sig_exit);
 	signal(SIGCHLD, sig_handler);
@@ -1802,8 +1803,23 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 			 * Propagate error, only if there's any. Ignore positive
 			 * number of returned events and interrupt error.
 			 */
-			if (err > 0 || (err < 0 && errno == EINTR))
+			if (err > 0 || (err < 0 && errno == EINTR)) {
 				err = 0;
+				if (evlist__ctlfd_process(rec->evlist, &cmd) > 0) {
+					switch (cmd) {
+					case EVLIST_CTL_CMD_ENABLE:
+						pr_info(EVLIST_ENABLED_MSG);
+						break;
+					case EVLIST_CTL_CMD_DISABLE:
+						pr_info(EVLIST_DISABLED_MSG);
+						break;
+					case EVLIST_CTL_CMD_ACK:
+					case EVLIST_CTL_CMD_UNSUPPORTED:
+					default:
+						break;
+					}
+				}
+			}
 			waking++;
 
 			if (evlist__filter_pollfd(rec->evlist, POLLERR | POLLHUP) == 0)
-- 
2.24.1