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Diffstat (limited to 'tools/perf/Documentation/perf-daemon.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-daemon.txt | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-daemon.txt b/tools/perf/Documentation/perf-daemon.txt index 1a4158cd973e..173b3f9f3a41 100644 --- a/tools/perf/Documentation/perf-daemon.txt +++ b/tools/perf/Documentation/perf-daemon.txt @@ -20,6 +20,20 @@ DESCRIPTION This command allows to run simple daemon process that starts and monitors configured record sessions. +You can imagine 'perf daemon' of background process with several +'perf record' child tasks, like: + + # ps axjf + ... + 1 916507 ... perf daemon start + 916507 916508 ... \_ perf record --control=fifo:control,ack -m 10M -e cycles --overwrite --switch-output -a + 916507 916509 ... \_ perf record --control=fifo:control,ack -m 20M -e sched:* --overwrite --switch-output -a + +Not every 'perf record' session is suitable for running under daemon. +User need perf session that either produces data on query, like the +flight recorder sessions in above example or session that is configured +to produce data periodically, like with --switch-output configuration +for time and size. OPTIONS ------- @@ -43,6 +57,22 @@ START COMMAND The start command creates the daemon process. +CONFIG FILE +----------- +The daemon is configured within standard perf config file by +following new variables: + +daemon.base: + Base path for daemon data. All sessions data are + stored under this path. + +session-<NAME>.run: + Defines new record session. The value is record's command + line without the 'record' keyword. + +Each perf record session is run in daemon.base/<NAME> directory. + + SEE ALSO -------- linkperf:perf-record[1], linkperf:perf-config[1] |