linux-kernel - [PATCH mm-unstable v1 5/7] mm: multi-gen LRU: improve lru_gen_exit

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Message-ID: <20230118001827.1040870-6-talumbau@google.com>
Date:   Wed, 18 Jan 2023 00:18:25 +0000
From:   "T.J. Alumbaugh" <talumbau@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-mm@...gle.com, "T.J. Alumbaugh" <talumbau@...gle.com>
Subject: [PATCH mm-unstable v1 5/7] mm: multi-gen LRU: improve lru_gen_exit_memcg()

Add warnings and poison ->next.

Signed-off-by: T.J. Alumbaugh <talumbau@...gle.com>
---
 mm/vmscan.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 796d4ca65e97..c2e6ad53447b 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -6168,12 +6168,17 @@ void lru_gen_exit_memcg(struct mem_cgroup *memcg)
 	int i;
 	int nid;
 
+	VM_WARN_ON_ONCE(!list_empty(&memcg->mm_list.fifo));
+
 	for_each_node(nid) {
 		struct lruvec *lruvec = get_lruvec(memcg, nid);
 
+		VM_WARN_ON_ONCE(lruvec->mm_state.nr_walkers);
 		VM_WARN_ON_ONCE(memchr_inv(lruvec->lrugen.nr_pages, 0,
 					   sizeof(lruvec->lrugen.nr_pages)));
 
+		lruvec->lrugen.list.next = LIST_POISON1;
+
 		for (i = 0; i < NR_BLOOM_FILTERS; i++) {
 			bitmap_free(lruvec->mm_state.filters[i]);
 			lruvec->mm_state.filters[i] = NULL;
-- 
2.39.0.314.g84b9a713c41-goog