linux/tools/perf/Documentation/perf-lock.txt

perf-lock(1)
============

NAME
----
perf-lock - Analyze lock events

SYNOPSIS
--------
[verse]
'perf lock' {record|report|script|info|contention}

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.

  'perf lock contention' shows contention statistics.

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.

--vmlinux=<file>::
        vmlinux pathname

--kallsyms=<file>::
        kallsyms pathname


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
--------
linkperf:perf[1]