| perf-ftrace(1) |
| ============== |
| |
| NAME |
| ---- |
| perf-ftrace - simple wrapper for kernel's ftrace functionality |
| |
| |
| SYNOPSIS |
| -------- |
| [verse] |
| 'perf ftrace' <command> |
| |
| DESCRIPTION |
| ----------- |
| The 'perf ftrace' command is a simple wrapper of kernel's ftrace |
| functionality. It only supports single thread tracing currently and |
| just reads trace_pipe in text and then write it to stdout. |
| |
| The following options apply to perf ftrace. |
| |
| OPTIONS |
| ------- |
| |
| -t:: |
| --tracer=:: |
| Tracer to use: function_graph or function. |
| |
| -v:: |
| --verbose=:: |
| Verbosity level. |
| |
| -p:: |
| --pid=:: |
| Trace on existing process id (comma separated list). |
| |
| -a:: |
| --all-cpus:: |
| Force system-wide collection. Scripts run without a <command> |
| normally use -a by default, while scripts run with a <command> |
| normally don't - this option allows the latter to be run in |
| system-wide mode. |
| |
| -C:: |
| --cpu=:: |
| Only trace for the list of CPUs provided. Multiple CPUs can |
| be provided as a comma separated list with no space like: 0,1. |
| Ranges of CPUs are specified with -: 0-2. |
| Default is to trace on all online CPUs. |
| |
| -T:: |
| --trace-funcs=:: |
| Only trace functions given by the argument. Multiple functions |
| can be given by using this option more than once. The function |
| argument also can be a glob pattern. It will be passed to |
| 'set_ftrace_filter' in tracefs. |
| |
| -N:: |
| --notrace-funcs=:: |
| Do not trace functions given by the argument. Like -T option, |
| this can be used more than once to specify multiple functions |
| (or glob patterns). It will be passed to 'set_ftrace_notrace' |
| in tracefs. |
| |
| -G:: |
| --graph-funcs=:: |
| Set graph filter on the given function (or a glob pattern). |
| This is useful for the function_graph tracer only and enables |
| tracing for functions executed from the given function. |
| This can be used more than once to specify multiple functions. |
| It will be passed to 'set_graph_function' in tracefs. |
| |
| -g:: |
| --nograph-funcs=:: |
| Set graph notrace filter on the given function (or a glob pattern). |
| Like -G option, this is useful for the function_graph tracer only |
| and disables tracing for function executed from the given function. |
| This can be used more than once to specify multiple functions. |
| It will be passed to 'set_graph_notrace' in tracefs. |
| |
| -D:: |
| --graph-depth=:: |
| Set max depth for function graph tracer to follow |
| |
| SEE ALSO |
| -------- |
| linkperf:perf-record[1], linkperf:perf-trace[1] |
