perf-probe.txt

perf-probe(1)
=============

NAME
----
perf-probe - Define new dynamic tracepoints

SYNOPSIS
--------
[verse]
'perf probe' [options] --add 'PROBE' [--add 'PROBE' ...]
or
'perf probe' [options] 'PROBE' ['PROBE' ...]


DESCRIPTION
-----------
This command defines dynamic tracepoint events, by symbol and registers
without debuginfo, or by C expressions (C line numbers, C function names,
and C local variables) with debuginfo.


OPTIONS
-------
-k::
--vmlinux=PATH::
	Specify vmlinux path which has debuginfo (Dwarf binary).

-v::
--verbose::
        Be more verbose (show parsed arguments, etc).

-a::
--add::
	Define a probe point (see PROBE SYNTAX for detail)

PROBE SYNTAX
------------
Probe points are defined by following syntax.

 "FUNC[+OFFS|:RLN|%return][@SRC]|SRC:ALN [ARG ...]"

'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. In addition, 'SRC' specifies a source file which has that function.
It is also possible to specify a probe point by the source line number by using 'SRC:ALN' syntax, where 'SRC' is the source file path and 'ALN' is the line number.
'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).

SEE ALSO
--------
linkperf:perf-trace[1], linkperf:perf-record[1]