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perf/probes: Update Documentation/perf-probe.txt

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Update Documentation/perf-probe.txt accoding to recent
syntax changes.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
LKML-Reference: <20091104001212.3454.19415.stgit@harusame>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2009-11-03 19:12:13 -05:00 committed by Ingo Molnar
parent 12e4db4790
commit c43f9d1e61
1 changed files with 9 additions and 8 deletions
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17
tools/perf/Documentation/perf-probe.txt
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@ -8,7 +8,9 @@ perf-probe - Define new dynamic tracepoints
SYNOPSIS
--------
[verse]
'perf probe' [-k <file>] -P 'PROBE' [-P 'PROBE' ...]
'perf probe' [options] --add 'PROBE' [--add 'PROBE' ...]
or
'perf probe' [options] 'PROBE' ['PROBE' ...]
DESCRIPTION
@ -21,26 +23,25 @@ and C local variables) with debuginfo.
OPTIONS
-------
-k::
--vmlinux::
--vmlinux=PATH::
Specify vmlinux path which has debuginfo (Dwarf binary).
-v::
--verbose::
Be more verbose (show parsed arguments, etc).
-P::
--probe::
-a::
--add::
Define a probe point (see PROBE SYNTAX for detail)
PROBE SYNTAX
------------
Probe points are defined by following syntax.
"TYPE:[GRP/]NAME FUNC[+OFFS][@SRC]|@SRC:LINE [ARG ...]"
"FUNC[+OFFS|:RLN|%return][@SRC]|SRC:ALN [ARG ...]"
'TYPE' specifies the type of probe point, you can use either "p" (kprobe) or "r" (kretprobe) for 'TYPE'. 'GRP' specifies the group name of this probe, and 'NAME' specifies the event name. If 'GRP' is omitted, "kprobes" is used for its group name.
'FUNC' and 'OFFS' specifies function and offset (in byte) where probe will be put. In addition, 'SRC' specifies a source file which has that function (this is mainly for inline functions).
You can specify a probe point by the source line number by using '@SRC:LINE' syntax, where 'SRC' is the source file path and 'LINE' is the line number.
'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