linux-kernel - [PATCH 18/24] perf daemon: Add examples to man page

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Date:   Mon,  8 Feb 2021 21:09:02 +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>,
        Alexei Budankov <abudankov@...wei.com>
Subject: [PATCH 18/24] perf daemon: Add examples to man page

Adding usage examples to the man page.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/Documentation/perf-daemon.txt | 98 ++++++++++++++++++++++++
 1 file changed, 98 insertions(+)

diff --git a/tools/perf/Documentation/perf-daemon.txt b/tools/perf/Documentation/perf-daemon.txt
index 90b20bea6356..f558f8e4bc9b 100644
--- a/tools/perf/Documentation/perf-daemon.txt
+++ b/tools/perf/Documentation/perf-daemon.txt
@@ -41,6 +41,10 @@ for time and size.
 Each session is started with control setup (with perf record --control
 options).
 
+Sessions are configured through config file, see CONFIG FILE section
+with EXAMPLES.
+
+
 OPTIONS
 -------
 -v::
@@ -105,6 +109,100 @@ session-<NAME>.run:
 Each perf record session is run in daemon.base/<NAME> directory.
 
 
+EXAMPLES
+--------
+Example with 2 record sessions:
+
+  # 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
+
+
+Check sessions:
+
+  # perf daemon
+  [603349:daemon] base: /opt/perfdata
+  [603350:cycles] perf record -m 10M -e cycles --overwrite --switch-output -a
+  [603351:sched] perf record -m 20M -e sched:* --overwrite --switch-output -a
+
+First line is daemon process info with configured daemon base.
+
+
+Check sessions with more info:
+
+  # perf daemon -v
+  [603349:daemon] base: /opt/perfdata
+    output:  /opt/perfdata/output
+    lock:    /opt/perfdata/lock
+    up:      1 minutes
+  [603350:cycles] perf record -m 10M -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:      1 minutes
+  [603351: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:      1 minutes
+
+The 'base' path is daemon/session base.
+The 'lock' file is daemon's lock file guarding that no other
+daemon is running on top of the base.
+The 'output' file is perf record output for specific session.
+The 'control' and 'ack' files are perf control files.
+The 'up' number shows minutes daemon/session is running.
+
+
+Make sure control session is online:
+
+  # perf daemon ping
+  OK   cycles
+  OK   sched
+
+
+Send USR2 signal to session 'cycles' to generate perf.data file:
+
+  # perf daemon signal --session cycles
+  signal 12 sent to session 'cycles [603452]'
+
+  # tail -2  /opt/perfdata/session-cycles/output
+  [ perf record: dump data: Woken up 1 times ]
+  [ perf record: Dump perf.data.2020123017013149 ]
+
+
+Send USR2 signal to all sessions:
+
+  # perf daemon signal
+  signal 12 sent to session 'cycles [603452]'
+  signal 12 sent to session 'sched [603453]'
+
+  # tail -2  /opt/perfdata/session-cycles/output
+  [ perf record: dump data: Woken up 1 times ]
+  [ perf record: Dump perf.data.2020123017024689 ]
+  # tail -2  /opt/perfdata/session-sched/output
+  [ perf record: dump data: Woken up 1 times ]
+  [ perf record: Dump perf.data.2020123017024713 ]
+
+
+Stop daemon:
+
+  # perf daemon stop
+
+
 SEE ALSO
 --------
 linkperf:perf-record[1], linkperf:perf-config[1]
-- 
2.29.2