linux-kernel - [PATCH] mm: vmscan: reset sc->priority on retry

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Date: Wed, 29 May 2024 08:49:11 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>
Cc: Rik van Riel <riel@...riel.com>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Michal Hocko <mhocko@...nel.org>,
	Facebook Kernel Team <kernel-team@...com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	syzbot+17416257cb95200cba44@...kaller.appspotmail.com
Subject: [PATCH] mm: vmscan: reset sc->priority on retry

The commit 6be5e186fd65 ("mm: vmscan: restore incremental cgroup
iteration") added a retry reclaim heuristic to iterate all the cgroups
before returning an unsuccessful reclaim but missed to reset the
sc->priority. Let's fix it.

Reported-and-tested-by: syzbot+17416257cb95200cba44@...kaller.appspotmail.com
Fixes: 6be5e186fd65 ("mm: vmscan: restore incremental cgroup iteration")
Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>
---
 mm/vmscan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index b9170f767353..731b009a142b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -6317,6 +6317,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist,
 	 * meaningful forward progress. Avoid false OOMs in this case.
 	 */
 	if (!sc->memcg_full_walk) {
+		sc->priority = initial_priority;
 		sc->memcg_full_walk = 1;
 		goto retry;
 	}
-- 
2.43.0