summaryrefslogtreecommitdiffstats
path: root/tools/perf/Documentation/perf-lock.txt
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--tools/perf/Documentation/perf-lock.txt174
1 files changed, 174 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt
new file mode 100644
index 000000000..4958a1ffa
--- /dev/null
+++ b/tools/perf/Documentation/perf-lock.txt
@@ -0,0 +1,174 @@
+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).
+
+-q::
+--quiet::
+ Do not show any warnings or messages. (Suppress -v)
+
+-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
+
+-E::
+--entries=<value>::
+ Display this many entries.
+
+
+INFO OPTIONS
+------------
+
+-t::
+--threads::
+ dump thread list in perf.data
+
+-m::
+--map::
+ dump map of lock instances (address:name table)
+
+
+CONTENTION OPTIONS
+--------------
+
+-k::
+--key=<value>::
+ Sorting key. Possible values: contended, wait_total (default),
+ wait_max, wait_min, avg_wait.
+
+-F::
+--field=<value>::
+ Output fields. By default it shows all but the wait_min fields
+ and users can customize that using this. Possible values:
+ contended, wait_total, wait_max, wait_min, avg_wait.
+
+-t::
+--threads::
+ Show per-thread lock contention stat
+
+-b::
+--use-bpf::
+ Use BPF program to collect lock contention stats instead of
+ using the input data.
+
+-a::
+--all-cpus::
+ System-wide collection from all CPUs.
+
+-C::
+--cpu::
+ Collect samples only on the list of CPUs provided. Multiple CPUs can be
+ provided as a comma-separated list with no space: 0,1. Ranges of CPUs
+ are specified with -: 0-2. Default is to monitor all CPUs.
+
+-p::
+--pid=::
+ Record events on existing process ID (comma separated list).
+
+--tid=::
+ Record events on existing thread ID (comma separated list).
+
+--map-nr-entries::
+ Maximum number of BPF map entries (default: 10240).
+
+--max-stack::
+ Maximum stack depth when collecting lock contention (default: 8).
+
+--stack-skip
+ Number of stack depth to skip when finding a lock caller (default: 3).
+
+-E::
+--entries=<value>::
+ Display this many entries.
+
+
+SEE ALSO
+--------
+linkperf:perf[1]