perf-ftrace (1)
Leading comments
Title: perf-ftrace
Author: [FIXME: author] [see http://docbook.sf.net/el/author]
Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
Date: 09/12/2017
Manual: perf Manual
Source: perf
Language: English
NAME
perf-ftrace - simple wrapper for kernel's ftrace functionalitySYNOPSIS
perf ftrace <command>
DESCRIPTION
The perf ftrace command is a simple wrapper of kernelcqs 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 doncqt - 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