linux-kernel - [RFC PATCH 10/10] ftrace: Factorize search and insertion in the function hashlist

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Date:	Fri, 22 Jan 2010 02:16:22 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>
Subject: [RFC PATCH 10/10] ftrace: Factorize search and insertion in the function hashlist

Factorize search and insertion operations in the function hashlist
to remove some redundant code.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/trace/ftrace.c                |   18 ++++++------------
 kernel/trace/functions_hlist.h       |   12 ++++++++++++
 kernel/trace/trace_functions_graph.c |   17 +++++++----------
 3 files changed, 25 insertions(+), 22 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index d719078..785d077 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -385,12 +385,9 @@ function_profile_call(unsigned long ip, unsigned long parent_ip)
 
 	hlist = &__get_cpu_var(func_hlist_cpu);
 
-	rec = function_find_hlist_node(hlist, ip);
-	if (!rec) {
-		rec = function_hlist_record_alloc(hlist, ip);
-		if (!rec)
-			goto out;
-	}
+	rec = function_get_hlist_node(hlist, ip);
+	if (!rec)
+		goto out;
 
 	rec->counter++;
  out:
@@ -2198,12 +2195,9 @@ change_graph_function_hlist(unsigned long ip, int val, struct func_hlist *hlist)
 {
 	struct func_node *rec;
 
-	rec = function_find_hlist_node(hlist, ip);
-	if (!rec) {
-		rec = function_hlist_record_alloc(hlist, ip);
-		if (!rec)
-			return 1;
-	}
+	rec = function_get_hlist_node(hlist, ip);
+	if (!rec)
+		return 1;
 
 	rec->graph_start = val;
 
diff --git a/kernel/trace/functions_hlist.h b/kernel/trace/functions_hlist.h
index 39d89b4..3baf4bb 100644
--- a/kernel/trace/functions_hlist.h
+++ b/kernel/trace/functions_hlist.h
@@ -40,3 +40,15 @@ int get_function_hlist(void);
 void put_function_hlist(void);
 void function_hlist_reset_profile(void);
 void function_hlist_reset_graph(void);
+
+static inline struct func_node *
+function_get_hlist_node(struct func_hlist *hlist, unsigned long ip)
+{
+	struct func_node *rec;
+
+	rec = function_find_hlist_node(hlist, ip);
+	if (!rec)
+		rec = function_hlist_record_alloc(hlist, ip);
+
+	return rec;
+}
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index da24add..0fa0691 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -213,16 +213,13 @@ static inline int ftrace_graph_addr(unsigned long addr)
 
 	hlist = &__get_cpu_var(func_hlist_cpu);
 
-	rec = function_find_hlist_node(hlist, addr);
-	if (!rec) {
-		/*
-		 * TODO: send a retrieval error event
-		 * to keep track of this.
-		 */
-		rec = function_hlist_record_alloc(hlist, addr);
-		if (!rec)
-			return 0;
-	}
+	/*
+	 * TODO: send a retrieval error event
+	 * to keep track of failures
+	 */
+	rec = function_get_hlist_node(hlist, addr);
+	if (!rec)
+		return 0;
 
 	if (rec->graph_start)
 		return 1;
-- 
1.6.2.3

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