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rcu: Allocate WQ with WQ_MEM_RECLAIM bit set

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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: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
This commit is contained in:
Uladzislau Rezki (Sony) 2024-03-08 18:34:09 +01:00
parent 462df2f543
commit 0fd210baa0
1 changed files with 5 additions and 1 deletions
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6
kernel/rcu/tree.c
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@ -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)