Provided by: linux-tools-common_4.18.0-10.11_all
perf-ftrace - simple wrapper for kernel's ftrace functionality
perf ftrace <command>
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.
-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