linux-kernel - [PATCH 15/22] perf daemon: Use control to stop session

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Message-Id: <20210102220441.794923-16-jolsa@kernel.org>
Date:   Sat,  2 Jan 2021 23:04:34 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexei Budankov <abudankov@...wei.com>
Subject: [PATCH 15/22] perf daemon: Use control to stop session

Using 'stop' control command to stop perf record session.
If that fails, falling back to current SIGTERM/SIGKILL pair.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/builtin-daemon.c | 56 ++++++++++++++++++++++++++++++-------
 1 file changed, 46 insertions(+), 10 deletions(-)

diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index 260bcffd9ae8..e45a1acaad18 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -502,11 +502,33 @@ session__control(struct session *session, const char *msg, bool do_ack)
 
 static void session__kill(struct session *session, struct daemon *daemon)
 {
-	session__signal(session, SIGTERM);
-	if (session__wait(session, daemon, 10)) {
-		session__signal(session, SIGKILL);
-		session__wait(session, daemon, 10);
-	}
+	int how = 0;
+
+	do {
+		switch (how) {
+		case 0:
+			session__control(session, "stop", false);
+			break;
+		case 1:
+			session__signal(session, SIGTERM);
+			break;
+		case 2:
+			session__signal(session, SIGKILL);
+			break;
+		default:
+			break;
+		}
+		how++;
+
+	} while (session__wait(session, daemon, 10));
+}
+
+static void daemon__stop(struct daemon *daemon)
+{
+	struct session *session;
+
+	list_for_each_entry(session, &daemon->sessions, list)
+		session__control(session, "stop", false);
 }
 
 static int daemon__reconfig(struct daemon *daemon)
@@ -545,11 +567,25 @@ static int daemon__reconfig(struct daemon *daemon)
 
 static void daemon__kill(struct daemon *daemon)
 {
-	daemon__signal(daemon, SIGTERM);
-	if (daemon__wait(daemon, 10)) {
-		daemon__signal(daemon, SIGKILL);
-		daemon__wait(daemon, 10);
-	}
+	int how = 0;
+
+	do {
+		switch (how) {
+		case 0:
+			daemon__stop(daemon);
+			break;
+		case 1:
+			daemon__signal(daemon, SIGTERM);
+			break;
+		case 2:
+			daemon__signal(daemon, SIGKILL);
+			break;
+		default:
+			break;
+		}
+		how++;
+
+	} while (daemon__wait(daemon, 10));
 }
 
 static void daemon__free(struct daemon *daemon)
-- 
2.26.2