From ad5e00cfb9105d7c9a6b79a59580b1075fbf06e5 Mon Sep 17 00:00:00 2001
From: Samy Al Bahra <sbahra@appnexus.com>
Date: Thu, 2 Jan 2014 09:11:36 -0500
Subject: [PATCH] ck_epoch: Read-side latency improvements on x86.

---
 include/ck_epoch.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/ck_epoch.h b/include/ck_epoch.h
index 277f9fb..9de8780 100644
--- a/include/ck_epoch.h
+++ b/include/ck_epoch.h
@@ -100,8 +100,15 @@ ck_epoch_begin(ck_epoch_t *epoch, ck_epoch_record_t *record)
 		 * For this reason, store to load serialization is necessary.
 		 */
 		ck_pr_store_uint(&record->epoch, g_epoch);
+
+#if defined(__x86__) || defined(__x86_64__)
+		ck_pr_fas_uint(&record->active, 1);
+		ck_pr_fence_atomic_load();
+#else
 		ck_pr_store_uint(&record->active, 1);
 		ck_pr_fence_store_load();
+#endif
+
 		return;
 	}