Linux/tools/perf/Documentation/perf-ftrace.txt

Version: ~ [ linux-6.12-rc7 ] ~ [ linux-6.11.7 ] ~ [ linux-6.10.14 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.60 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.116 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.171 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.229 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.285 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.323 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.12 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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1 perf-ftrace(1) 1 perf-ftrace(1) 2 ============== !! 2 ============= 3 3 4 NAME 4 NAME 5 ---- 5 ---- 6 perf-ftrace - simple wrapper for kernel's ftra 6 perf-ftrace - simple wrapper for kernel's ftrace functionality 7 7 8 8 9 SYNOPSIS 9 SYNOPSIS 10 -------- 10 -------- 11 [verse] 11 [verse] 12 'perf ftrace' {trace|latency|profile} <command !! 12 'perf ftrace' <command> 13 13 14 DESCRIPTION 14 DESCRIPTION 15 ----------- 15 ----------- 16 The 'perf ftrace' command provides a collectio !! 16 The 'perf ftrace' command is a simple wrapper of kernel's ftrace 17 kernel's ftrace infrastructure. !! 17 functionality. It only supports single thread tracing currently and 18 !! 18 just reads trace_pipe in text and then write it to stdout. 19 'perf ftrace trace' is a simple wrapper of t << 20 single thread tracing currently and just rea << 21 write it to stdout. << 22 << 23 'perf ftrace latency' calculates execution l << 24 (optionally with BPF) and display it as a hi << 25 << 26 'perf ftrace profile' show a execution profi << 27 total, average, max time and the number of c << 28 19 29 The following options apply to perf ftrace. 20 The following options apply to perf ftrace. 30 21 31 COMMON OPTIONS !! 22 OPTIONS 32 -------------- !! 23 ------- 33 << 34 -p:: << 35 --pid=:: << 36 Trace on existing process id (comma se << 37 << 38 --tid=:: << 39 Trace on existing thread id (comma sep << 40 << 41 -a:: << 42 --all-cpus:: << 43 Force system-wide collection. Scripts << 44 normally use -a by default, while scri << 45 normally don't - this option allows th << 46 system-wide mode. << 47 << 48 -C:: << 49 --cpu=:: << 50 Only trace for the list of CPUs provid << 51 be provided as a comma separated list << 52 Ranges of CPUs are specified with -: 0 << 53 Default is to trace on all online CPUs << 54 << 55 -v:: << 56 --verbose:: << 57 Increase the verbosity level. << 58 << 59 << 60 OPTIONS for 'perf ftrace trace' << 61 ------------------------------- << 62 24 63 -t:: 25 -t:: 64 --tracer=:: 26 --tracer=:: 65 Tracer to use when neither -G nor -F o !! 27 Tracer to use: function_graph or function. 66 specified: function_graph or function. << 67 28 68 -F:: !! 29 -v:: 69 --funcs:: !! 30 --verbose=:: 70 List available functions to trace. It !! 31 Verbosity level. 71 only list interested functions. << 72 << 73 -D:: << 74 --delay:: << 75 Time (ms) to wait before starting trac << 76 << 77 -m:: << 78 --buffer-size:: << 79 Set the size of per-cpu tracing buffer << 80 be a number with appended unit charact << 81 << 82 --inherit:: << 83 Trace children processes spawned by ou << 84 << 85 -T:: << 86 --trace-funcs=:: << 87 Select function tracer and set functio << 88 function (or a glob pattern). Multiple << 89 by using this option more than once. T << 90 can be a glob pattern. It will be pass << 91 in tracefs. << 92 << 93 -N:: << 94 --notrace-funcs=:: << 95 Select function tracer and do not trac << 96 argument. Like -T option, this can be << 97 specify multiple functions (or glob pa << 98 passed to 'set_ftrace_notrace' in trac << 99 << 100 --func-opts:: << 101 List of options allowed to set: << 102 << 103 - call-graph - Display kernel stack << 104 - irq-info - Display irq context i << 105 << 106 -G:: << 107 --graph-funcs=:: << 108 Select function_graph tracer and set g << 109 function (or a glob pattern). This is << 110 functions executed from the given func << 111 than once to specify multiple function << 112 'set_graph_function' in tracefs. << 113 << 114 -g:: << 115 --nograph-funcs=:: << 116 Select function_graph tracer and set g << 117 given function (or a glob pattern). Li << 118 for the function_graph tracer only and << 119 executed from the given function. This << 120 specify multiple functions. It will be << 121 in tracefs. << 122 << 123 --graph-opts:: << 124 List of options allowed to set: << 125 << 126 - nosleep-time - Measure on-CPU time << 127 - noirqs - Ignore functions th << 128 - verbose - Show process names, << 129 - thresh=<n> - Setup trace duratio << 130 - depth=<n> - Set max depth for f << 131 - tail - Print function name << 132 << 133 << 134 OPTIONS for 'perf ftrace latency' << 135 --------------------------------- << 136 << 137 -T:: << 138 --trace-funcs=:: << 139 Set the function name to get the histo << 140 it only allows single function to calc << 141 << 142 -b:: << 143 --use-bpf:: << 144 Use BPF to measure function latency in << 145 uses function_graph tracer internally) << 146 << 147 -n:: << 148 --use-nsec:: << 149 Use nano-second instead of micro-secon << 150 << 151 << 152 OPTIONS for 'perf ftrace profile' << 153 --------------------------------- << 154 << 155 -T:: << 156 --trace-funcs=:: << 157 Set function filter on the given funct << 158 Multiple functions can be given by usi << 159 The function argument also can be a gl << 160 to 'set_ftrace_filter' in tracefs. << 161 << 162 -N:: << 163 --notrace-funcs=:: << 164 Do not trace functions given by the ar << 165 can be used more than once to specify << 166 patterns). It will be passed to 'set_ << 167 << 168 -G:: << 169 --graph-funcs=:: << 170 Set graph filter on the given function << 171 useful to trace for functions executed << 172 can be used more than once to specify << 173 passed to 'set_graph_function' in trac << 174 << 175 -g:: << 176 --nograph-funcs=:: << 177 Set graph notrace filter on the given << 178 Like -G option, this is useful for the << 179 disables tracing for function executed << 180 can be used more than once to specify << 181 passed to 'set_graph_notrace' in trace << 182 << 183 -m:: << 184 --buffer-size:: << 185 Set the size of per-cpu tracing buffer << 186 be a number with appended unit charact << 187 << 188 -s:: << 189 --sort=:: << 190 Sort the result by the given field. A << 191 total, avg, max, count, name. Default << 192 32 193 33 194 SEE ALSO 34 SEE ALSO 195 -------- 35 -------- 196 linkperf:perf-record[1], linkperf:perf-trace[1 36 linkperf:perf-record[1], linkperf:perf-trace[1]

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Linux/tools/perf/Documentation/perf-ftrace.txt