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-rw-r--r--Documentation/trace/kprobetrace.txt5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/trace/kprobetrace.txt b/Documentation/trace/kprobetrace.txt
index 5ea85059db3b..1a3a3d6bc2a8 100644
--- a/Documentation/trace/kprobetrace.txt
+++ b/Documentation/trace/kprobetrace.txt
@@ -24,7 +24,7 @@ current_tracer. Instead of that, add probe points via
Synopsis of kprobe_events
-------------------------
p[:[GRP/]EVENT] [MOD:]SYM[+offs]|MEMADDR [FETCHARGS] : Set a probe
- r[:[GRP/]EVENT] [MOD:]SYM[+0] [FETCHARGS] : Set a return probe
+ r[MAXACTIVE][:[GRP/]EVENT] [MOD:]SYM[+0] [FETCHARGS] : Set a return probe
-:[GRP/]EVENT : Clear a probe
GRP : Group name. If omitted, use "kprobes" for it.
@@ -33,6 +33,9 @@ Synopsis of kprobe_events
MOD : Module name which has given SYM.
SYM[+offs] : Symbol+offset where the probe is inserted.
MEMADDR : Address where the probe is inserted.
+ MAXACTIVE : Maximum number of instances of the specified function that
+ can be probed simultaneously, or 0 for the default value
+ as defined in Documentation/kprobes.txt section 1.3.1.
FETCHARGS : Arguments. Each probe can have up to 128 args.
%REG : Fetch register REG