This is a note to let you know that I've just added the patch titled
bcache: Give btree_io_wq correct semantics again
to the 5.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bcache-give-btree_io_wq-correct-semantics-again.patch
and it can be found in the queue-5.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d797bd9897e3559eb48d68368550d637d32e468c Mon Sep 17 00:00:00 2001
From: Kai Krakow <kai@xxxxxxxxxxx>
Date: Wed, 10 Feb 2021 13:07:26 +0800
Subject: bcache: Give btree_io_wq correct semantics again
From: Kai Krakow <kai@xxxxxxxxxxx>
commit d797bd9897e3559eb48d68368550d637d32e468c upstream.
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@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 5.4+
Signed-off-by: Kai Krakow <kai@xxxxxxxxxxx>
Signed-off-by: Coly Li <colyli@xxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/bcache/btree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- 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;
Patches currently in stable-queue which might be from kai@xxxxxxxxxxx are
queue-5.11/revert-bcache-kill-btree_io_wq.patch
queue-5.11/bcache-give-btree_io_wq-correct-semantics-again.patch
queue-5.11/bcache-move-journal-work-to-new-flush-wq.patch
