[LEDE-DEV] [PATCH v3] procd: add timing to start/stop logging

[Karl Vogel]

Shows how long an initd task took, for example:

 procd: stop /etc/init.d/dropbear running - took 0.088824s
 procd: Update service dnsmasq
 procd: Update instance dnsmasq::dnsmasq
 procd: running /etc/init.d/dnsmasq running
 procd: start /etc/init.d/dnsmasq running
 procd: stop /etc/init.d/dnsmasq running - took 0.092586s

 v2: rename variables, correct time unit
 v3: use CLOCK_MONOTONIC_RAW to prevent issues with NTP and adjtime

Signed-off-by: Karl Vogel <karl.vogel at gmail.com>
---
 rcS.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/rcS.c b/rcS.c
index dd3b76d..c2e1abb 100644
--- a/rcS.c
+++ b/rcS.c
@@ -37,6 +37,7 @@ static struct runqueue q, r;
 struct initd {
 	struct ustream_fd fd;
 	struct runqueue_process proc;
+	struct timespec ts_start;
 	char *file;
 	char *param;
 };
@@ -70,6 +71,7 @@ static void q_initd_run(struct runqueue *q, struct runqueue_task *t)
 	int pipefd[2];
 	pid_t pid;
 
+	clock_gettime(CLOCK_MONOTONIC_RAW, &s->ts_start);
 	DEBUG(2, "start %s %s \n", s->file, s->param);
 	if (pipe(pipefd) == -1) {
 		ERROR("Failed to create pipe: %m\n");
@@ -106,8 +108,17 @@ static void q_initd_run(struct runqueue *q, struct runqueue_task *t)
 static void q_initd_complete(struct runqueue *q, struct runqueue_task *p)
 {
 	struct initd *s = container_of(p, struct initd, proc.task);
+	struct timespec ts_stop, ts_res;
+
+	clock_gettime(CLOCK_MONOTONIC_RAW, &ts_stop);
+	ts_res.tv_sec = ts_stop.tv_sec - s->ts_start.tv_sec;
+	ts_res.tv_nsec = ts_stop.tv_nsec - s->ts_start.tv_nsec;
+	if (ts_res.tv_nsec < 0) {
+		--ts_res.tv_sec;
+		ts_res.tv_nsec += 1000000000;
+	}
 
-	DEBUG(2, "stop %s %s \n", s->file, s->param);
+	DEBUG(2, "stop %s %s - took %lu.%09lus\n", s->file, s->param, ts_res.tv_sec, ts_res.tv_nsec);
 	ustream_free(&s->fd.stream);
 	close(s->fd.fd.fd);
 	free(s);
-- 
2.15.1