path: root/Documentation/trace
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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2011-06-27 16:26:56 +0900
committerSteven Rostedt <rostedt@goodmis.org>2011-07-15 15:17:14 -0400
commit614243181050436785f5a621749a7da2336a7916 (patch)
treed64445cc0bc14420b993e82bd4bb4723ea8e34fa /Documentation/trace
parentbc81d48d13d8839fae6833c95794c403b2133f36 (diff)
tracing/kprobes: Support module init function probing
To support probing module init functions, kprobe-tracer allows user to define a probe on non-existed function when it is given with a module name. This also enables user to set a probe on a function on a specific module, even if a same name (but different) function is locally defined in another module. The module name must be in the front of function name and separated by a ':'. e.g. btrfs:btrfs_init_sysfs Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Link: http://lkml.kernel.org/r/20110627072656.6528.89970.stgit@fedora15 Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/trace')
1 files changed, 5 insertions, 4 deletions
diff --git a/Documentation/trace/kprobetrace.txt b/Documentation/trace/kprobetrace.txt
index c83bd6b4e6e..d0d0bb9e3e2 100644
--- a/Documentation/trace/kprobetrace.txt
+++ b/Documentation/trace/kprobetrace.txt
@@ -22,14 +22,15 @@ current_tracer. Instead of that, add probe points via
Synopsis of kprobe_events
- p[:[GRP/]EVENT] SYMBOL[+offs]|MEMADDR [FETCHARGS] : Set a probe
- r[:[GRP/]EVENT] SYMBOL[+0] [FETCHARGS] : Set a return probe
+ p[:[GRP/]EVENT] [MOD:]SYM[+offs]|MEMADDR [FETCHARGS] : Set a probe
+ r[:[GRP/]EVENT] [MOD:]SYM[+0] [FETCHARGS] : Set a return probe
-:[GRP/]EVENT : Clear a probe
GRP : Group name. If omitted, use "kprobes" for it.
EVENT : Event name. If omitted, the event name is generated
- based on SYMBOL+offs or MEMADDR.
- SYMBOL[+offs] : Symbol+offset where the probe is inserted.
+ based on SYM+offs or MEMADDR.
+ MOD : Module name which has given SYM.
+ SYM[+offs] : Symbol+offset where the probe is inserted.
MEMADDR : Address where the probe is inserted.
FETCHARGS : Arguments. Each probe can have up to 128 args.