175 lines
3.9 KiB
Plaintext
175 lines
3.9 KiB
Plaintext
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perf-lock(1)
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============
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NAME
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----
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perf-lock - Analyze lock events
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SYNOPSIS
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--------
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[verse]
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'perf lock' {record|report|script|info|contention}
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DESCRIPTION
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-----------
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You can analyze various lock behaviours
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and statistics with this 'perf lock' command.
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'perf lock record <command>' records lock events
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between start and end <command>. And this command
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produces the file "perf.data" which contains tracing
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results of lock events.
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'perf lock report' reports statistical data.
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'perf lock script' shows raw lock events.
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'perf lock info' shows metadata like threads or addresses
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of lock instances.
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'perf lock contention' shows contention statistics.
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COMMON OPTIONS
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--------------
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-i::
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--input=<file>::
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Input file name. (default: perf.data unless stdin is a fifo)
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-v::
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--verbose::
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Be more verbose (show symbol address, etc).
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-q::
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--quiet::
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Do not show any warnings or messages. (Suppress -v)
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-D::
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--dump-raw-trace::
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Dump raw trace in ASCII.
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-f::
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--force::
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Don't complain, do it.
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--vmlinux=<file>::
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vmlinux pathname
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--kallsyms=<file>::
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kallsyms pathname
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REPORT OPTIONS
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--------------
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-k::
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--key=<value>::
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Sorting key. Possible values: acquired (default), contended,
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avg_wait, wait_total, wait_max, wait_min.
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-F::
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--field=<value>::
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Output fields. By default it shows all the fields but users can
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customize that using this. Possible values: acquired, contended,
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avg_wait, wait_total, wait_max, wait_min.
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-c::
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--combine-locks::
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Merge lock instances in the same class (based on name).
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-t::
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--threads::
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The -t option is to show per-thread lock stat like below:
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$ perf lock report -t -F acquired,contended,avg_wait
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Name acquired contended avg wait (ns)
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perf 240569 9 5784
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swapper 106610 19 543
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:15789 17370 2 14538
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ContainerMgr 8981 6 874
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sleep 5275 1 11281
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ContainerThread 4416 4 944
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RootPressureThr 3215 5 1215
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rcu_preempt 2954 0 0
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ContainerMgr 2560 0 0
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unnamed 1873 0 0
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EventManager_De 1845 1 636
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futex-default-S 1609 0 0
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-E::
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--entries=<value>::
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Display this many entries.
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INFO OPTIONS
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------------
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-t::
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--threads::
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dump thread list in perf.data
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-m::
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--map::
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dump map of lock instances (address:name table)
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CONTENTION OPTIONS
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--------------
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-k::
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--key=<value>::
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Sorting key. Possible values: contended, wait_total (default),
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wait_max, wait_min, avg_wait.
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-F::
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--field=<value>::
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Output fields. By default it shows all but the wait_min fields
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and users can customize that using this. Possible values:
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contended, wait_total, wait_max, wait_min, avg_wait.
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-t::
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--threads::
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Show per-thread lock contention stat
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-b::
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--use-bpf::
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Use BPF program to collect lock contention stats instead of
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using the input data.
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-a::
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--all-cpus::
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System-wide collection from all CPUs.
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-C::
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--cpu::
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Collect samples only on the list of CPUs provided. Multiple CPUs can be
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provided as a comma-separated list with no space: 0,1. Ranges of CPUs
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are specified with -: 0-2. Default is to monitor all CPUs.
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-p::
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--pid=::
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Record events on existing process ID (comma separated list).
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--tid=::
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Record events on existing thread ID (comma separated list).
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--map-nr-entries::
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Maximum number of BPF map entries (default: 10240).
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--max-stack::
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Maximum stack depth when collecting lock contention (default: 8).
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--stack-skip
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Number of stack depth to skip when finding a lock caller (default: 3).
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-E::
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--entries=<value>::
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Display this many entries.
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SEE ALSO
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--------
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linkperf:perf[1]
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