linux-kernel - [RFC][PATCH -tip 9/9] tracing: kprobe-tracer plugin supports module

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Message-ID: <49C2B4D9.6040602@redhat.com>
Date:	Thu, 19 Mar 2009 17:10:49 -0400
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>
CC:	systemtap-ml <systemtap@...rces.redhat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [RFC][PATCH -tip 9/9] tracing: kprobe-tracer plugin supports module_probe

Use register/unregister_module_*probe functions for tracing
module .init/.exit functions.

Signed-off-by: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Ingo Molnar <mingo@...e.hu>
---
 kernel/trace/trace_kprobe.c |   15 ++++++++++-----
 1 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index e801e8c..7b7ab53 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -226,6 +226,11 @@ static void free_trace_probe(struct trace_probe *tp)
 	kfree(tp);
 }

+static int activate_handler(void *offset, struct module *mod)
+{
+	return ((unsigned long)offset == 0) ? 1 : 0;
+}
+
 static int register_trace_probe(struct trace_probe *tp)
 {
 	int ret;
@@ -234,9 +239,10 @@ static int register_trace_probe(struct trace_probe *tp)
 	list_add_tail(&tp->list, &probe_list);

 	if (probe_is_return(tp))
-		ret = register_kretprobe(&tp->rp);
+		ret = register_module_kretprobe(&tp->rp, activate_handler, 0);
 	else
-		ret = register_kprobe(&tp->kp);
+		ret = register_module_kprobe(&tp->kp, activate_handler,
+					     (void *)(tp->kp.offset));

 	if (ret) {
 		pr_warning("Probe registering error: %d\n", ret);
@@ -249,9 +255,9 @@ static int register_trace_probe(struct trace_probe *tp)
 static void unregister_trace_probe(struct trace_probe *tp)
 {
 	if (probe_is_return(tp))
-		unregister_kretprobe(&tp->rp);
+		unregister_module_kretprobe(&tp->rp);
 	else
-		unregister_kprobe(&tp->kp);
+		unregister_module_kprobe(&tp->kp);
 	list_del(&tp->list);
 }

@@ -301,7 +307,6 @@ static int create_trace_probe(int argc, char **argv)
 	} else {
 		/* a symbol specified */
 		symbol = argv[1];
-		/* TODO: support .init module functions */
 		tmp = strchr(symbol, '+');
 		if (!tmp)
 			tmp = strchr(symbol, '-');
-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com


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