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Documentation: tracing: Add %return suffix description

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Add a description of the %return suffix option for kprobe event and
uprobe event.

Link: https://lkml.kernel.org/r/159972815624.428528.10450874184415697524.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu
2020-09-10 17:55:56 +09:00
committed by Steven Rostedt (VMware)
parent 3dd3aae32d
commit 638e476d1d
2 changed files with 4 additions and 0 deletions
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Documentation/trace/kprobetrace.rst
+2
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@@ -30,6 +30,7 @@ Synopsis of kprobe_events
p[:[GRP/]EVENT] [MOD:]SYM[+offs]|MEMADDR [FETCHARGS] : Set a probe p[:[GRP/]EVENT] [MOD:]SYM[+offs]|MEMADDR [FETCHARGS] : Set a probe
r[MAXACTIVE][:[GRP/]EVENT] [MOD:]SYM[+0] [FETCHARGS] : Set a return probe r[MAXACTIVE][:[GRP/]EVENT] [MOD:]SYM[+0] [FETCHARGS] : Set a return probe
p:[GRP/]EVENT] [MOD:]SYM[+0]%return [FETCHARGS] : Set a return probe
-:[GRP/]EVENT : Clear a probe -:[GRP/]EVENT : Clear a probe
GRP : Group name. If omitted, use "kprobes" for it. GRP : Group name. If omitted, use "kprobes" for it.
@@ -37,6 +38,7 @@ Synopsis of kprobe_events
based on SYM+offs or MEMADDR. based on SYM+offs or MEMADDR.
MOD : Module name which has given SYM. MOD : Module name which has given SYM.
SYM[+offs] : Symbol+offset where the probe is inserted. SYM[+offs] : Symbol+offset where the probe is inserted.
SYM%return : Return address of the symbol
MEMADDR : Address where the probe is inserted. MEMADDR : Address where the probe is inserted.
MAXACTIVE : Maximum number of instances of the specified function that MAXACTIVE : Maximum number of instances of the specified function that
can be probed simultaneously, or 0 for the default value can be probed simultaneously, or 0 for the default value
Documentation/trace/uprobetracer.rst
+2
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@@ -28,6 +28,7 @@ Synopsis of uprobe_tracer
p[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a uprobe p[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a uprobe
r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a return uprobe (uretprobe) r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] : Set a return uprobe (uretprobe)
p[:[GRP/]EVENT] PATH:OFFSET%return [FETCHARGS] : Set a return uprobe (uretprobe)
-:[GRP/]EVENT : Clear uprobe or uretprobe event -:[GRP/]EVENT : Clear uprobe or uretprobe event
GRP : Group name. If omitted, "uprobes" is the default value. GRP : Group name. If omitted, "uprobes" is the default value.
@@ -35,6 +36,7 @@ Synopsis of uprobe_tracer
on PATH+OFFSET. on PATH+OFFSET.
PATH : Path to an executable or a library. PATH : Path to an executable or a library.
OFFSET : Offset where the probe is inserted. OFFSET : Offset where the probe is inserted.
OFFSET%return : Offset where the return probe is inserted.
FETCHARGS : Arguments. Each probe can have up to 128 args. FETCHARGS : Arguments. Each probe can have up to 128 args.
%REG : Fetch register REG %REG : Fetch register REG