linux-kernel - [PATCH 2/2 v6] tracing/uprobes: Support soft-mode disabling

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Message-ID: <51D556BB.50400@huawei.com>
Date:	Thu, 4 Jul 2013 19:04:27 +0800
From:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2 v6] tracing/uprobes: Support soft-mode disabling

Support soft-mode disabling on uprobe-based dynamic events.
Soft-disabling is just ignoring recording if the soft disabled
flag is set.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwe@...wei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
---
 kernel/trace/trace_uprobe.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 2fc9931..94f180d 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -530,6 +530,9 @@ static void uprobe_trace_print(struct trace_uprobe *tu,

 	WARN_ON(call != ftrace_file->event_call);

+	if (test_bit(FTRACE_EVENT_FL_SOFT_DISABLED_BIT, &ftrace_file->flags))
+		return;
+
 	size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
 	event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
 						call->event.type,
-- 
1.7.9.7


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