perf daemon: Add up time for daemon/session list

Display up time for both daemon and sessions.

Example:

  # cat ~/.perfconfig
  [daemon]
  base=/opt/perfdata

  [session-cycles]
  run = -m 10M -e cycles --overwrite --switch-output -a

  [session-sched]
  run = -m 20M -e sched:* --overwrite --switch-output -a

Starting the daemon:

  # perf daemon start

Get the details with up time:

  # perf daemon -v
  [778315:daemon] base: /opt/perfdata
    output:  /opt/perfdata/output
    lock:    /opt/perfdata/lock
    up:      15 minutes
  [778316:cycles] perf record -m 20M -e cycles --overwrite --switch-output -a
    base:    /opt/perfdata/session-cycles
    output:  /opt/perfdata/session-cycles/output
    control: /opt/perfdata/session-cycles/control
    ack:     /opt/perfdata/session-cycles/ack
    up:      10 minutes
  [778317:sched] perf record -m 20M -e sched:* --overwrite --switch-output -a
    base:    /opt/perfdata/session-sched
    output:  /opt/perfdata/session-sched/output
    control: /opt/perfdata/session-sched/control
    ack:     /opt/perfdata/session-sched/ack
    up:      2 minutes
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: https://lore.kernel.org/r/20210208200908.1019149-18-jolsa@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-daemon.c

@@ -25,6 +25,7 @@
 #include <sys/wait.h>
 #include <poll.h>
 #include <sys/stat.h>
+#include <time.h>
 #include "builtin.h"
 #include "perf.h"
 #include "debug.h"
@@ -80,6 +81,7 @@ struct daemon_session {
 	int				 pid;
 	struct list_head		 list;
 	enum daemon_session_state	 state;
+	time_t				 start;
 };
 
 struct daemon {
@@ -93,6 +95,7 @@ struct daemon {
 	FILE			*out;
 	char			 perf[PATH_MAX];
 	int			 signal_fd;
+	time_t			 start;
 };
 
 static struct daemon __daemon = {
@@ -335,6 +338,8 @@ static int daemon_session__run(struct daemon_session *session,
 		return -1;
 	}
 
+	session->start = time(NULL);
+
 	session->pid = fork();
 	if (session->pid < 0)
 		return -1;
@@ -665,6 +670,7 @@ static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out)
 {
 	char csv_sep = cmd->list.csv_sep;
 	struct daemon_session *session;
+	time_t curr = time(NULL);
 
 	if (csv_sep) {
 		fprintf(out, "%d%c%s%c%s%c%s/%s",
@@ -679,6 +685,10 @@ static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out)
 			/* lock */
 			csv_sep, daemon->base, "lock");
 
+		fprintf(out, "%c%lu",
+			/* session up time */
+			csv_sep, (curr - daemon->start) / 60);
+
 		fprintf(out, "\n");
 	} else {
 		fprintf(out, "[%d:daemon] base: %s\n", getpid(), daemon->base);
@@ -687,6 +697,8 @@ static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out)
 				daemon->base, SESSION_OUTPUT);
 			fprintf(out, "  lock:    %s/lock\n",
 				daemon->base);
+			fprintf(out, "  up:      %lu minutes\n",
+				(curr - daemon->start) / 60);
 		}
 	}
 
@@ -712,6 +724,10 @@ static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out)
 				/* session ack */
 				csv_sep, session->base, SESSION_ACK);
 
+			fprintf(out, "%c%lu",
+				/* session up time */
+				csv_sep, (curr - session->start) / 60);
+
 			fprintf(out, "\n");
 		} else {
 			fprintf(out, "[%d:%s] perf record %s\n",
@@ -726,6 +742,8 @@ static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out)
 				session->base, SESSION_CONTROL);
 			fprintf(out, "  ack:     %s/%s\n",
 				session->base, SESSION_ACK);
+			fprintf(out, "  up:      %lu minutes\n",
+				(curr - session->start) / 60);
 		}
 	}
 
@@ -1239,6 +1257,8 @@ static int __cmd_start(struct daemon *daemon, struct option parent_options[],
 	if (argc)
 		usage_with_options(daemon_usage, start_options);
 
+	daemon->start = time(NULL);
+
 	if (setup_config(daemon)) {
 		pr_err("failed: config not found\n");
 		return -1;