PERF-LOCK(1)

NAME
perf-lock - Analyze lock events

SYNOPSIS

perf lock {record|report|script|info}

DESCRIPTION

You can analyze various lock behaviours and statistics with this perf lock command.

    'perf lock record <command>' records lock events
    between start and end <command>. And this command
    produces the file "perf.data" which contains tracing
    results of lock events.

    'perf lock report' reports statistical data.

    'perf lock script' shows raw lock events.

    'perf lock info' shows metadata like threads or addresses
    of lock instances.

COMMON OPTIONS

-i, --input=<file>
    Input file name. (default: perf.data unless stdin is a fifo)

-v, --verbose
    Be more verbose (show symbol address, etc).

-D, --dump-raw-trace
    Dump raw trace in ASCII.

-f, --force
    Don’t complain, do it.

REPORT OPTIONS

-k, --key=<value>
    Sorting key. Possible values: acquired (default), contended, avg_wait, wait_total, wait_max, wait_min.

-F, --field=<value>
    Output fields. By default it shows all the fields but users can customize that using this. Possible values: acquired, contended, avg_wait, wait_total, wait_max, wait_min.

-c, --combine-locks
    Merge lock instances in the same class (based on name).

-t, --threads
    The -t option is to show per-thread lock stat like below:

        $ perf lock report -t -F acquired,contended,avg_wait

        Name   acquired  contended   avg wait (ns)

                   perf     240569          9            5784
                swapper     106610         19             543
                 :15789      17370          2           14538
           ContainerMgr       8981          6             874
                  sleep       5275          1           11281
        ContainerThread       4416          4             944
        RootPressureThr       3215          5            1215
            rcu_preempt       2954          0               0
           ContainerMgr       2560          0               0
                unnamed       1873          0               0
        EventManager_De       1845          1             636
        futex-default-S       1609          0               0

INFO OPTIONS

-t, --threads
    dump thread list in perf.data

-m, --map
    dump map of lock instances (address:name table)

SEE ALSO

perf(1)