From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Date: Tue, 29 Sep 2009 03:34:52 +0000 (-0400)
Subject: Align registry data on cache line size
X-Git-Tag: v0.1~6
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=bd1a5e15ab6d3e42be1af622bbc53a30f5ae3769;p=userspace-rcu.git

Align registry data on cache line size

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
---

diff --git a/urcu-qsbr-static.h b/urcu-qsbr-static.h
index 1cac56c..8735c7f 100644
--- a/urcu-qsbr-static.h
+++ b/urcu-qsbr-static.h
@@ -184,8 +184,10 @@ static inline void reader_barrier()
 extern unsigned long urcu_gp_ctr;
 
 struct urcu_reader {
+	/* Data used by both reader and synchronize_rcu() */
 	unsigned long ctr;
-	struct list_head head;
+	/* Data used for registry */
+	struct list_head head __attribute__((aligned(CACHE_LINE_SIZE)));
 	pthread_t tid;
 };
 
diff --git a/urcu-static.h b/urcu-static.h
index f2a463c..3b7ea32 100644
--- a/urcu-static.h
+++ b/urcu-static.h
@@ -220,10 +220,12 @@ static inline void reader_barrier()
 extern long urcu_gp_ctr;
 
 struct urcu_reader {
+	/* Data used by both reader and synchronize_rcu() */
 	long ctr;
-	struct list_head head;
-	pthread_t tid;
 	char need_mb;
+	/* Data used for registry */
+	struct list_head head __attribute__((aligned(CACHE_LINE_SIZE)));
+	pthread_t tid;
 };
 
 extern struct urcu_reader __thread urcu_reader;