-l::
--list[=[GROUP:]EVENT]::
- List up current probe events. This can also accept filtering patterns of event names.
+ List up current probe events. This can also accept filtering patterns of
+ event names.
+ When this is used with --cache, perf shows all cached probes instead of
+ the live probes.
-L::
--line=::
Dry run. With this option, --add and --del doesn't execute actual
adding and removal operations.
+--cache::
+ (With --add) Cache the probes. Any events which successfully added
+ are also stored in the cache file.
+ (With --list) Show cached probes.
+ (With --del) Remove cached probes.
+
--max-probes=NUM::
Set the maximum number of probe points for an event. Default is 128.
Probe points are defined by following syntax.
1) Define event based on function name
- [EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
+ [[GROUP:]EVENT=]FUNC[@SRC][:RLN|+OFFS|%return|;PTN] [ARG ...]
2) Define event based on source file with line number
- [EVENT=]SRC:ALN [ARG ...]
+ [[GROUP:]EVENT=]SRC:ALN [ARG ...]
3) Define event based on source file with lazy pattern
- [EVENT=]SRC;PTN [ARG ...]
+ [[GROUP:]EVENT=]SRC;PTN [ARG ...]
-'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'.
+'EVENT' specifies the name of new event, if omitted, it will be set the name of the probed function. You can also specify a group name by 'GROUP', if omitted, set 'probe' is used for kprobe and 'probe_<bin>' is used for uprobe.
+Note that using existing group name can conflict with other events. Especially, using the group name reserved for kernel modules can hide embedded events in the
+modules.
'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.
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.
'ARG' specifies the arguments of this probe point, (see PROBE ARGUMENT).