From: Kai Krakow <kai@kaishome.de>
Date: Wed, 10 Feb 2021 05:07:26 +0000 (+0800)
Subject: bcache: Give btree_io_wq correct semantics again
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d797bd9897e3559eb48d68368550d637d32e468c;p=linux.git

bcache: Give btree_io_wq correct semantics again

Before killing `btree_io_wq`, the queue was allocated using
`create_singlethread_workqueue()` which has `WQ_MEM_RECLAIM`. After
killing it, it no longer had this property but `system_wq` is not
single threaded.

Let's combine both worlds and make it multi threaded but able to
reclaim memory.

Cc: Coly Li <colyli@suse.de>
Cc: stable@vger.kernel.org # 5.4+
Signed-off-by: Kai Krakow <kai@kaishome.de>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index 952f022db5a5f..fe6dce125aba2 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -2775,7 +2775,7 @@ void bch_btree_exit(void)
 
 int __init bch_btree_init(void)
 {
-	btree_io_wq = create_singlethread_workqueue("bch_btree_io");
+	btree_io_wq = alloc_workqueue("bch_btree_io", WQ_MEM_RECLAIM, 0);
 	if (!btree_io_wq)
 		return -ENOMEM;