From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Fri, 24 Oct 2014 11:07:48 +0000 (-0400)
Subject: workqueue: steal all: only steal from workers when steal flag is set
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=2e1ced1f1ec38b5c9e85fe407a6e8390b9ac6416;p=userspace-rcu.git

workqueue: steal all: only steal from workers when steal flag is set

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/urcu/workqueue-fifo.h b/urcu/workqueue-fifo.h
index ff0c650..c2766e5 100644
--- a/urcu/workqueue-fifo.h
+++ b/urcu/workqueue-fifo.h
@@ -514,13 +514,15 @@ bool urcu_workqueue_steal_all(struct urcu_workqueue *queue,
 	struct urcu_worker *sibling;
 	bool has_work = false;
 
-	rcu_read_lock();
-	/* Steal from each worker */
-	cds_list_for_each_entry_rcu(sibling, &queue->sibling_head,
-			sibling_node)
-		has_work |= ___urcu_grab_work(worker, &sibling->head,
-					&sibling->tail, 1);
-	rcu_read_unlock();
+	if (worker->flags & URCU_WORKER_STEAL) {
+		rcu_read_lock();
+		/* Steal from each worker */
+		cds_list_for_each_entry_rcu(sibling, &queue->sibling_head,
+				sibling_node)
+			has_work |= ___urcu_grab_work(worker, &sibling->head,
+						&sibling->tail, 1);
+		rcu_read_unlock();
+	}
 
 	/* Steal from global workqueue */
 	has_work |= ___urcu_grab_work(worker, &queue->head, &queue->tail, 0);