From 949d49ec306dfca51d63d89bc316211a2a008cfc Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@redhat.com>
Date: Wed, 13 Jul 2022 07:05:51 -0400
Subject: [PATCH] dm kcopyd: use __GFP_HIGHMEM when allocating pages
Git-commit: 949d49ec306dfca51d63d89bc316211a2a008cfc
Patch-mainline: v6.0-rc1
References: jsc#PED-2765
dm-kcopyd doesn't access the allocated pages directly, it only passes
them to dm-io which adds them to a bio list - thus, we can allocate
the pages from high memory. This will reduce pressure on the low
memory when there are a large number of kcopyd jobs in progress.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Coly Li <colyli@suse.de>
---
drivers/md/dm-kcopyd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/md/dm-kcopyd.c b/drivers/md/dm-kcopyd.c
index 37b03ab7e5c9..6aa821a02d44 100644
--- a/drivers/md/dm-kcopyd.c
+++ b/drivers/md/dm-kcopyd.c
@@ -219,7 +219,7 @@ static struct page_list *alloc_pl(gfp_t gfp)
if (!pl)
return NULL;
- pl->page = alloc_page(gfp);
+ pl->page = alloc_page(gfp | __GFP_HIGHMEM);
if (!pl->page) {
kfree(pl);
return NULL;
--
2.35.3