From: Kai Krakow kai@kaishome.de

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 --- drivers/md/bcache/btree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 952f022db5a5..fe6dce125aba 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;