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.\"     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: 2018-01-15
.\"    Manual: perf Manual
.\"    Source: perf
.\"  Language: English
.\"
.TH "PERF_4.15\-FTRACE" "1" "2018\-01\-15" "perf" "perf Manual"
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.SH "NAME"
perf-ftrace \- simple wrapper for kernel\*(Aqs ftrace functionality
.SH "SYNOPSIS"
.sp
.nf
\fIperf ftrace\fR <command>
.fi
.SH "DESCRIPTION"
.sp
The \fIperf ftrace\fR command is a simple wrapper of kernel\(cqs ftrace functionality\&. It only supports single thread tracing currently and just reads trace_pipe in text and then write it to stdout\&.
.sp
The following options apply to perf ftrace\&.
.SH "OPTIONS"
.PP
\-t, \-\-tracer=
.RS 4
Tracer to use: function_graph or function\&.
.RE
.PP
\-v, \-\-verbose=
.RS 4
Verbosity level\&.
.RE
.PP
\-p, \-\-pid=
.RS 4
Trace on existing process id (comma separated list)\&.
.RE
.PP
\-a, \-\-all\-cpus
.RS 4
Force system\-wide collection\&. Scripts run without a <command> normally use \-a by default, while scripts run with a <command> normally don\(cqt \- this option allows the latter to be run in system\-wide mode\&.
.RE
.PP
\-C, \-\-cpu=
.RS 4
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\&.
.RE
.PP
\-T, \-\-trace\-funcs=
.RS 4
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
\fIset_ftrace_filter\fR
in tracefs\&.
.RE
.PP
\-N, \-\-notrace\-funcs=
.RS 4
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
\fIset_ftrace_notrace\fR
in tracefs\&.
.RE
.PP
\-G, \-\-graph\-funcs=
.RS 4
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
\fIset_graph_function\fR
in tracefs\&.
.RE
.PP
\-g, \-\-nograph\-funcs=
.RS 4
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
\fIset_graph_notrace\fR
in tracefs\&.
.RE
.PP
\-D, \-\-graph\-depth=
.RS 4
Set max depth for function graph tracer to follow
.RE
.SH "SEE ALSO"
.sp
\fBperf_4.15-record\fR(1), \fBperf_4.15-trace\fR(1)