6 perf-probe - Define new dynamic tracepoints
11 'perf probe' [options] --add='PROBE' [...]
13 'perf probe' [options] PROBE
15 'perf probe' [options] --del='[GROUP:]EVENT' [...]
19 'perf probe' --line='FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]'
23 This command defines dynamic tracepoint events, by symbol and registers
24 without debuginfo, or by C expressions (C line numbers, C function names,
25 and C local variables) with debuginfo.
32 Specify vmlinux path which has debuginfo (Dwarf binary).
36 Be more verbose (show parsed arguments, etc).
40 Define a probe event (see PROBE SYNTAX for detail).
44 Delete probe events. This accepts glob wildcards('*', '?') and character
45 classes(e.g. [a-z], [!A-Z]).
49 List up current probe events.
53 Show source code lines which can be probed. This needs an argument
54 which specifies a range of the source code. (see LINE SYNTAX for detail)
58 Forcibly add events with existing name.
62 Probe points are defined by following syntax.
64 1) Define event based on function name
65 [EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
67 2) Define event based on source file with line number
68 [EVENT=]SRC:ALN [ARG ...]
70 3) Define event based on source file with lazy pattern
71 [EVENT=]SRC;PTN [ARG ...]
74 'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. Currently, event group name is set as 'probe'.
75 'FUNC' specifies a probed function name, and it may have one of the following options; '+OFFS' is the offset from function entry address in bytes, ':RLN' is the relative-line number from function entry line, and '%return' means that it probes function return. And ';PTN' means lazy matching pattern (see LAZY MATCHING). Note that ';PTN' must be the end of the probe point definition. In addition, '@SRC' specifies a source file which has that function.
76 It is also possible to specify a probe point by the source line number or lazy matching by using 'SRC:ALN' or 'SRC;PTN' syntax, where 'SRC' is the source file path, ':ALN' is the line number and ';PTN' is the lazy matching pattern.
77 'ARG' specifies the arguments of this probe point. You can use the name of local variable, or kprobe-tracer argument format (e.g. $retval, %ax, etc).
81 Line range is descripted by following syntax.
83 "FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]"
85 FUNC specifies the function name of showing lines. 'RLN' is the start line
86 number from function entry line, and 'RLN2' is the end line number. As same as
87 probe syntax, 'SRC' means the source file path, 'ALN' is start line number,
88 and 'ALN2' is end line number in the file. It is also possible to specify how
89 many lines to show by using 'NUM'.
90 So, "source.c:100-120" shows lines between 100th to l20th in source.c file. And "func:10+20" shows 20 lines from 10th line of func function.
94 The lazy line matching is similar to glob matching but ignoring spaces in both of pattern and target. So this accepts wildcards('*', '?') and character classes(e.g. [a-z], [!A-Z]).
97 'a=*' can matches 'a=b', 'a = b', 'a == b' and so on.
99 This provides some sort of flexibility and robustness to probe point definitions against minor code changes. For example, actual 10th line of schedule() can be moved easily by modifying schedule(), but the same line matching 'rq=cpu_rq*' may still exist in the function.)
104 Display which lines in schedule() can be probed:
106 ./perf probe --line schedule
108 Add a probe on schedule() function 12th line with recording cpu local variable:
110 ./perf probe schedule:12 cpu
112 ./perf probe --add='schedule:12 cpu'
114 this will add one or more probes which has the name start with "schedule".
116 Add probes on lines in schedule() function which calls update_rq_clock().
118 ./perf probe 'schedule;update_rq_clock*'
120 ./perf probe --add='schedule;update_rq_clock*'
122 Delete all probes on schedule().
124 ./perf probe --del='schedule*'
129 linkperf:perf-trace[1], linkperf:perf-record[1]