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| author | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2024-03-08 18:34:09 +0100 |
|---|---|---|
| committer | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2024-04-15 19:51:26 +0200 |
| commit | 0fd210baa07a9e3f15df1bc687293eafb119283a (patch) | |
| tree | 21cff89c99d8ca11c62fbfe79d986e95504c0ebf /kernel/rcu | |
| parent | 462df2f543ae360e79fcaa1b498d2a1a0c2a5b63 (diff) | |
| download | lwn-0fd210baa07a9e3f15df1bc687293eafb119283a.tar.gz lwn-0fd210baa07a9e3f15df1bc687293eafb119283a.zip | |
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: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tree.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 2a270abade4d..1d5c000e5c7a 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -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) |