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Subject[PATCH 14/24] perf daemon: Set control fifo for session
Date
Setup control fifos for session and add --control
option to session arguments.

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

Use can list control fifos with (control and ack files):

# perf daemon -v
[776459:daemon] base: /opt/perfdata
output: /opt/perfdata/output
lock: /opt/perfdata/lock
[776460: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
[776461: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

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/Documentation/perf-daemon.txt | 3 +++
tools/perf/builtin-daemon.c | 26 +++++++++++++++++++++++-
2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-daemon.txt b/tools/perf/Documentation/perf-daemon.txt
index 3c9e265858b2..b1acd468b89c 100644
--- a/tools/perf/Documentation/perf-daemon.txt
+++ b/tools/perf/Documentation/perf-daemon.txt
@@ -37,6 +37,9 @@ flight recorder sessions in above example or session that is configured
to produce data periodically, like with --switch-output configuration
for time and size.

+Each session is started with control setup (with perf record --control
+options).
+
OPTIONS
-------
-v::
diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index 22b2ec18b01b..7414041ae31d 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -32,6 +32,8 @@
#include "util.h"

#define SESSION_OUTPUT "output"
+#define SESSION_CONTROL "control"
+#define SESSION_ACK "ack"

/*
* Session states:
@@ -74,6 +76,7 @@ struct daemon_session {
char *base;
char *name;
char *run;
+ char *control;
int pid;
struct list_head list;
enum daemon_session_state state;
@@ -365,7 +368,18 @@ static int daemon_session__run(struct daemon_session *session,
dup2(fd, 2);
close(fd);

- scnprintf(buf, sizeof(buf), "%s record %s", daemon->perf, session->run);
+ if (mkfifo(SESSION_CONTROL, O_RDWR) && errno != EEXIST) {
+ perror("failed: create control fifo");
+ return -1;
+ }
+
+ if (mkfifo(SESSION_ACK, O_RDWR) && errno != EEXIST) {
+ perror("failed: create ack fifo");
+ return -1;
+ }
+
+ scnprintf(buf, sizeof(buf), "%s record --control=fifo:%s,%s %s",
+ daemon->perf, SESSION_CONTROL, SESSION_ACK, session->run);

argv = argv_split(buf, &argc);
if (!argv)
@@ -603,6 +617,12 @@ static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out)
/* session output */
csv_sep, session->base, SESSION_OUTPUT);

+ fprintf(out, "%c%s/%s%c%s/%s",
+ /* session control */
+ csv_sep, session->base, SESSION_CONTROL,
+ /* session ack */
+ csv_sep, session->base, SESSION_ACK);
+
fprintf(out, "\n");
} else {
fprintf(out, "[%d:%s] perf record %s\n",
@@ -613,6 +633,10 @@ static int cmd_session_list(struct daemon *daemon, union cmd *cmd, FILE *out)
session->base);
fprintf(out, " output: %s/%s\n",
session->base, SESSION_OUTPUT);
+ fprintf(out, " control: %s/%s\n",
+ session->base, SESSION_CONTROL);
+ fprintf(out, " ack: %s/%s\n",
+ session->base, SESSION_ACK);
}
}

--
2.29.2
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