X-Git-Url: https://git.liburcu.org/?a=blobdiff_plain;f=urcu-call-rcu-impl.h;h=4e5879f381eadc8ebacd2efd079bfa588ac41c4b;hb=0b8ab7df078a6d8e1439b1db5849638892e1cc83;hp=cf65992f4e57a8bc86187744271c5ee4c58b6d26;hpb=5161f31e09ce33dd79afad8d08a2372fbf1c4fbe;p=urcu.git

diff --git a/urcu-call-rcu-impl.h b/urcu-call-rcu-impl.h
index cf65992..4e5879f 100644
--- a/urcu-call-rcu-impl.h
+++ b/urcu-call-rcu-impl.h
@@ -48,12 +48,13 @@
 
 struct call_rcu_data {
 	/*
-	 * Align the tail on cache line size to eliminate false-sharing
-	 * with head.
+	 * We do not align head on a different cache-line than tail
+	 * mainly because call_rcu callback-invocation threads use
+	 * batching ("splice") to get an entire list of callbacks, which
+	 * effectively empties the queue, and requires to touch the tail
+	 * anyway.
 	 */
-	struct cds_wfcq_tail __attribute__((aligned(CAA_CACHE_LINE_SIZE))) cbs_tail;
-	/* Alignment on cache line size will add padding here */
-
+	struct cds_wfcq_tail cbs_tail;
 	struct cds_wfcq_head cbs_head;
 	unsigned long flags;
 	int32_t futex;