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.
Tracer to use when neither -G nor -F option is not specified:
function_graph or function.
Increase the verbosity level.
List available functions to trace. It accepts a pattern to
only list interested functions.
Trace on existing process id (comma separated list).
Trace on existing thread id (comma separated list).
Time (ms) to wait before starting tracing after program
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.
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.
Set the size of per-cpu tracing buffer, <size> is expected to
be a number with appended unit character - B/K/M/G.
Trace children processes spawned by our target.
Select function tracer and set function filter on the given
function (or a glob pattern). 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.
Select function tracer and 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.
List of options allowed to set: call-graph - Display kernel
stack trace for function tracer. irq-info - Display irq
context info for function tracer.
Select function_graph tracer and set graph filter on the
given function (or a glob pattern). This is useful to trace
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.
Select function_graph tracer and 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.
List of options allowed to set: nosleep-time - Measure on-CPU
time only for function_graph tracer. noirqs - Ignore
functions that happen inside interrupt. verbose - Show
process names, PIDs, timestamps, etc. thresh=<n> - Setup
trace duration threshold in microseconds. depth=<n> - Set max
depth for function graph tracer to follow.
This page is part of the perf (Performance analysis tools for
Linux (in Linux source tree)) project. Information about the
project can be found at
⟨https://perf.wiki.kernel.org/index.php/Main_Page⟩. If you have a
bug report for this manual page, send it to
email@example.com. This page was obtained from the
project's upstream Git repository
on 2021-04-01. (At that time, the date of the most recent commit
that was found in the repository was 2021-03-31.) If you
discover any rendering problems in this HTML version of the page,
or you believe there is a better or more up-to-date source for
the page, or you have corrections or improvements to the
information in this COLOPHON (which is not part of the original
manual page), send a mail to firstname.lastname@example.org
perf 2021-03-06 PERF-FTRACE(1)