linux-kernel - [PATCH 5.9 213/391] io-wq: assign NUMA node locality if appropriate

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Date:   Tue,  3 Nov 2020 21:34:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.9 213/391] io-wq: assign NUMA node locality if appropriate

From: Jens Axboe <axboe@...nel.dk>

commit a8b595b22d31f83b715511f59012f152a269d83b upstream.

There was an assumption that kthread_create_on_node() would properly set
NUMA affinities in terms of CPUs allowed, but it doesn't. Make sure we
do this when creating an io-wq context on NUMA.

Cc: stable@...r.kernel.org
Stefan Metzmacher <metze@...ba.org>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/io-wq.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -654,6 +654,7 @@ static bool create_io_worker(struct io_w
 		kfree(worker);
 		return false;
 	}
+	kthread_bind_mask(worker->task, cpumask_of_node(wqe->node));
 
 	raw_spin_lock_irq(&wqe->lock);
 	hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list);