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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)

2022-09-24 perf