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1096c35aa8
The -D/--graph-depth option is to set max graph depth. The following
example traces max 2-depth of page fault handler.
$ sudo perf ftrace -G __do_page_fault -D 2 -- hello
...
0) | __do_page_fault() {
0) 0.063 us | down_read_trylock();
0) 0.251 us | find_vma();
0) 5.374 us | handle_mm_fault();
0) 0.054 us | up_read();
0) 7.463 us | }
...
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: kernel-team@lge.com
Link: http://lkml.kernel.org/r/20170618142302.25390-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
88 lines
2.3 KiB
Plaintext
88 lines
2.3 KiB
Plaintext
perf-ftrace(1)
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=============
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NAME
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----
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perf-ftrace - simple wrapper for kernel's ftrace functionality
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SYNOPSIS
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--------
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[verse]
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'perf ftrace' <command>
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DESCRIPTION
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-----------
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The 'perf ftrace' command is a simple wrapper of kernel's ftrace
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functionality. It only supports single thread tracing currently and
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just reads trace_pipe in text and then write it to stdout.
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The following options apply to perf ftrace.
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OPTIONS
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-------
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-t::
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--tracer=::
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Tracer to use: function_graph or function.
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-v::
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--verbose=::
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Verbosity level.
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-p::
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--pid=::
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Trace on existing process id (comma separated list).
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-a::
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--all-cpus::
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Force system-wide collection. Scripts run without a <command>
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normally use -a by default, while scripts run with a <command>
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normally don't - this option allows the latter to be run in
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system-wide mode.
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-C::
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--cpu=::
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Only trace for the list of CPUs provided. Multiple CPUs can
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be provided as a comma separated list with no space like: 0,1.
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Ranges of CPUs are specified with -: 0-2.
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Default is to trace on all online CPUs.
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-T::
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--trace-funcs=::
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Only trace functions given by the argument. Multiple functions
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can be given by using this option more than once. The function
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argument also can be a glob pattern. It will be passed to
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'set_ftrace_filter' in tracefs.
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-N::
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--notrace-funcs=::
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Do not trace functions given by the argument. Like -T option,
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this can be used more than once to specify multiple functions
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(or glob patterns). It will be passed to 'set_ftrace_notrace'
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in tracefs.
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-G::
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--graph-funcs=::
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Set graph filter on the given function (or a glob pattern).
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This is useful for the function_graph tracer only and enables
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tracing for functions executed from the given function.
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This can be used more than once to specify multiple functions.
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It will be passed to 'set_graph_function' in tracefs.
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-g::
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--nograph-funcs=::
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Set graph notrace filter on the given function (or a glob pattern).
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Like -G option, this is useful for the function_graph tracer only
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and disables tracing for function executed from the given function.
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This can be used more than once to specify multiple functions.
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It will be passed to 'set_graph_notrace' in tracefs.
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-D::
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--graph-depth=::
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Set max depth for function graph tracer to follow
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SEE ALSO
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--------
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linkperf:perf-record[1], linkperf:perf-trace[1]
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