perf-ftrace man page

perf-ftrace — simple wrapper for kernel's ftrace functionality

Synopsis

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

perf-record(1), perf-trace(1)

Info

04/16/2018 perf Manual