1PERF-FTRACE(1)                    perf Manual                   PERF-FTRACE(1)
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NAME

6       perf-ftrace - simple wrapper for kernel's ftrace functionality
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SYNOPSIS

9       perf ftrace <command>
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DESCRIPTION

12       The perf ftrace command is a simple wrapper of kernel’s ftrace
13       functionality. It only supports single thread tracing currently and
14       just reads trace_pipe in text and then write it to stdout.
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16       The following options apply to perf ftrace.
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OPTIONS

19       -t, --tracer=
20           Tracer to use when neither -G nor -F option is not specified:
21           function_graph or function.
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23       -v, --verbose
24           Increase the verbosity level.
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26       -F, --funcs
27           List available functions to trace. It accepts a pattern to only
28           list interested functions.
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30       -p, --pid=
31           Trace on existing process id (comma separated list).
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33       --tid=
34           Trace on existing thread id (comma separated list).
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36       -D, --delay
37           Time (ms) to wait before starting tracing after program start.
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39       -a, --all-cpus
40           Force system-wide collection. Scripts run without a <command>
41           normally use -a by default, while scripts run with a <command>
42           normally don’t - this option allows the latter to be run in
43           system-wide mode.
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45       -C, --cpu=
46           Only trace for the list of CPUs provided. Multiple CPUs can be
47           provided as a comma separated list with no space like: 0,1. Ranges
48           of CPUs are specified with -: 0-2. Default is to trace on all
49           online CPUs.
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51       -m, --buffer-size
52           Set the size of per-cpu tracing buffer, <size> is expected to be a
53           number with appended unit character - B/K/M/G.
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55       --inherit
56           Trace children processes spawned by our target.
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58       -T, --trace-funcs=
59           Select function tracer and set function filter on the given
60           function (or a glob pattern). Multiple functions can be given by
61           using this option more than once. The function argument also can be
62           a glob pattern. It will be passed to set_ftrace_filter in tracefs.
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64       -N, --notrace-funcs=
65           Select function tracer and do not trace functions given by the
66           argument. Like -T option, this can be used more than once to
67           specify multiple functions (or glob patterns). It will be passed to
68           set_ftrace_notrace in tracefs.
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70       --func-opts
71           List of options allowed to set: call-graph - Display kernel stack
72           trace for function tracer. irq-info - Display irq context info for
73           function tracer.
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75       -G, --graph-funcs=
76           Select function_graph tracer and set graph filter on the given
77           function (or a glob pattern). This is useful to trace for functions
78           executed from the given function. This can be used more than once
79           to specify multiple functions. It will be passed to
80           set_graph_function in tracefs.
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82       -g, --nograph-funcs=
83           Select function_graph tracer and set graph notrace filter on the
84           given function (or a glob pattern). Like -G option, this is useful
85           for the function_graph tracer only and disables tracing for
86           function executed from the given function. This can be used more
87           than once to specify multiple functions. It will be passed to
88           set_graph_notrace in tracefs.
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90       --graph-opts
91           List of options allowed to set: nosleep-time - Measure on-CPU time
92           only for function_graph tracer. noirqs - Ignore functions that
93           happen inside interrupt. verbose - Show process names, PIDs,
94           timestamps, etc. thresh=<n> - Setup trace duration threshold in
95           microseconds. depth=<n> - Set max depth for function graph tracer
96           to follow.
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SEE ALSO

99       perf-record(1), perf-trace(1)
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103perf                              06/03/2021                    PERF-FTRACE(1)
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