Commit 0fd210ba authored by Uladzislau Rezki (Sony)'s avatar Uladzislau Rezki (Sony)
Browse files

rcu: Allocate WQ with WQ_MEM_RECLAIM bit set 



synchronize_rcu() users have to be processed regardless
of memory pressure so our private WQ needs to have at least
one execution context what WQ_MEM_RECLAIM flag guarantees.

Reviewed-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Reviewed-by: default avatarJoel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: default avatarUladzislau Rezki (Sony) <urezki@gmail.com>
parent 462df2f5

kernel/rcu/tree.c

+5 −1
Original line number Diff line number Diff line
@@ -1582,6 +1582,7 @@ static void rcu_sr_put_wait_head(struct llist_node *node) 
/* Disabled by default. */

static int rcu_normal_wake_from_gp;

module_param(rcu_normal_wake_from_gp, int, 0644);

static struct workqueue_struct *sync_wq;



static void rcu_sr_normal_complete(struct llist_node *node)

{
@@ -1680,7 +1681,7 @@ static void rcu_sr_normal_gp_cleanup(void) 
	 * of outstanding users(if still left) and releasing wait-heads

	 * added by rcu_sr_normal_gp_init() call.

	 */

	schedule_work(&rcu_state.srs_cleanup_work);

	queue_work(sync_wq, &rcu_state.srs_cleanup_work);

}



/*
@@ -5585,6 +5586,9 @@ void __init rcu_init(void) 
	rcu_gp_wq = alloc_workqueue("rcu_gp", WQ_MEM_RECLAIM, 0);

	WARN_ON(!rcu_gp_wq);



	sync_wq = alloc_workqueue("sync_wq", WQ_MEM_RECLAIM, 0);

	WARN_ON(!sync_wq);



	/* Fill in default value for rcutree.qovld boot parameter. */

	/* -After- the rcu_node ->lock fields are initialized! */

	if (qovld < 0)