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Diffstat (limited to '')
| -rw-r--r-- | tools/perf/Documentation/perf-lock.txt | 108 |
1 files changed, 106 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt index 74d774592196..3b1e16563b79 100644 --- a/tools/perf/Documentation/perf-lock.txt +++ b/tools/perf/Documentation/perf-lock.txt @@ -8,7 +8,7 @@ perf-lock - Analyze lock events SYNOPSIS -------- [verse] -'perf lock' {record|report|script|info} +'perf lock' {record|report|script|info|contention} DESCRIPTION ----------- @@ -27,6 +27,8 @@ and statistics with this 'perf lock' command. 'perf lock info' shows metadata like threads or addresses of lock instances. + 'perf lock contention' shows contention statistics. + COMMON OPTIONS -------------- @@ -38,13 +40,24 @@ COMMON OPTIONS --verbose:: Be more verbose (show symbol address, etc). +-q:: +--quiet:: + Do not show any message. (Suppress -v) + -D:: --dump-raw-trace:: Dump raw trace in ASCII. -f:: --force:: - Don't complan, do it. + Don't complain, do it. + +--vmlinux=<file>:: + vmlinux pathname + +--kallsyms=<file>:: + kallsyms pathname + REPORT OPTIONS -------------- @@ -54,6 +67,42 @@ REPORT OPTIONS 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 ------------ @@ -65,6 +114,61 @@ INFO OPTIONS --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] |