Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: rzNmS4yBbc0OB0qugDU3l6drX7lfMDjXsdSHJXUHn4nYeqMNsrzUkEBfFFVjkzOWnUaVS8OzyU
 x+IrNt9Hl+bg==
IronPort-SDR: hvfmiW9n/dexrwztqT/5I5mS1V6ijzXjhh41vo0KbnBPK7m+JfGf1zzjs6OwR1n5vzONKWeoT4
 GpTjzuNT0z7g==
Subject: [PATCH v3 8/9] perf record: implement control commands handling
From:   Alexey Budankov <alexey.budankov@linux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@redhat.com>
Cc:     Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Andi Kleen <ak@linux.intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>
References: <eb38e9e5-754f-d410-1d9b-e26b702d51b7@linux.intel.com>
Organization: Intel Corp.
Message-ID: <25f98682-5ef2-4257-f302-93b29da707a9@linux.intel.com>
Date:   Wed, 13 May 2020 11:04:25 +0300
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101
 Thunderbird/68.7.0
MIME-Version: 1.0
In-Reply-To: <eb38e9e5-754f-d410-1d9b-e26b702d51b7@linux.intel.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


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

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