projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| d01f4e8d NK |
1 | perf-ftrace(1) |
| 2 | ============= | |
| 3 | ||
| 4 | NAME | |
| 5 | ---- | |
| 6 | perf-ftrace - simple wrapper for kernel's ftrace functionality | |
| 7 | ||
| 8 | ||
| 9 | SYNOPSIS | |
| 10 | -------- | |
| 11 | [verse] | |
| 12 | 'perf ftrace' <command> | |
| 13 | ||
| 14 | DESCRIPTION | |
| 15 | ----------- | |
| 16 | The 'perf ftrace' command is a simple wrapper of kernel's ftrace | |
| 17 | functionality. It only supports single thread tracing currently and | |
| 18 | just reads trace_pipe in text and then write it to stdout. | |
| 19 | ||
| 20 | The following options apply to perf ftrace. | |
| 21 | ||
| 22 | OPTIONS | |
| 23 | ------- | |
| 24 | ||
| 25 | -t:: | |
| 26 | --tracer=:: | |
| 27 | Tracer to use: function_graph or function. | |
| 28 | ||
| 29 | -v:: | |
| 30 | --verbose=:: | |
| 31 | Verbosity level. | |
| 32 | ||
| a9af6be5 NK |
33 | -p:: |
| 34 | --pid=:: | |
| 35 | Trace on existing process id (comma separated list). | |
| 36 | ||
| dc231032 NK |
37 | -a:: |
| 38 | --all-cpus:: | |
| 39 | Force system-wide collection. Scripts run without a <command> | |
| 40 | normally use -a by default, while scripts run with a <command> | |
| 41 | normally don't - this option allows the latter to be run in | |
| 42 | system-wide mode. | |
| 43 | ||
| 44 | -C:: | |
| 45 | --cpu=:: | |
| 46 | Only trace for the list of CPUs provided. Multiple CPUs can | |
| 47 | be provided as a comma separated list with no space like: 0,1. | |
| 48 | Ranges of CPUs are specified with -: 0-2. | |
| 49 | Default is to trace on all online CPUs. | |
| 50 | ||
| d01f4e8d NK |
51 | |
| 52 | SEE ALSO | |
| 53 | -------- | |
| 54 | linkperf:perf-record[1], linkperf:perf-trace[1] |