linux-kernel - [PATCH 4/5] tracing/uprobes: Support event triggering

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Date:	Fri, 17 Jan 2014 17:08:39 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Tom Zanussi <tom.zanussi@...ux.intel.com>
Subject: [PATCH 4/5] tracing/uprobes: Support event triggering

Add support for event triggering to uprobes.  This is same as kprobes
support added by Tom (plus cleanup by Steven).

Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@...wei.com>
Cc: Tom Zanussi <tom.zanussi@...ux.intel.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 kernel/trace/trace_uprobe.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 349c6df9e332..01fcb0db75cb 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -776,6 +776,9 @@ static void __uprobe_trace_func(struct trace_uprobe *tu,
 	if (WARN_ON_ONCE(tu->tp.size + dsize > PAGE_SIZE))
 		return;
 
+	if (ftrace_trigger_soft_disabled(ftrace_file))
+		return;
+
 	esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
 	size = esize + tu->tp.size + dsize;
 	event = trace_event_buffer_lock_reserve(&buffer, ftrace_file,
@@ -795,8 +798,7 @@ static void __uprobe_trace_func(struct trace_uprobe *tu,
 
 	memcpy(data, ucb->buf, tu->tp.size + dsize);
 
-	if (!call_filter_check_discard(call, entry, buffer, event))
-		trace_buffer_unlock_commit(buffer, event, 0, 0);
+	event_trigger_unlock_commit(ftrace_file, buffer, event, entry, 0, 0);
 }
 
 /* uprobe handler */
-- 
1.7.11.7

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