>
> 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.
>
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
> ---
> kernel/rcu/tree.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
> index 475647620b12..59881a68dd26 100644
> --- a/kernel/rcu/tree.c
> +++ b/kernel/rcu/tree.c
> @@ -1581,6 +1581,7 @@ 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)
> {
> @@ -1679,7 +1680,7 @@ 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.
> */
> - queue_work(system_highpri_wq, &rcu_state.srs_cleanup_work);
> + queue_work(sync_wq, &rcu_state.srs_cleanup_work);
> }
>
> /*
> @@ -5584,6 +5585,9 @@ 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);
Why was WQ_HIGHPRI removed?
Thanks
Zqiang
> + WARN_ON(!sync_wq);
> +
> /* Fill in default value for rcutree.qovld boot parameter. */
> /* -After- the rcu_node ->lock fields are initialized! */
> if (qovld < 0)
> --
> 2.39.2
>
>
