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PERF-LOCK(1) perf Manual 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)

2022-08-02 perf