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Message-ID: <20230802025606.346758-3-kaleshsingh@google.com>
Date: Tue, 1 Aug 2023 19:56:04 -0700
From: Kalesh Singh <kaleshsingh@...gle.com>
To: yuzhao@...gle.com, akpm@...ux-foundation.org
Cc: surenb@...gle.com, android-mm@...gle.com, kernel-team@...roid.com,
Kalesh Singh <kaleshsingh@...gle.com>,
Matthias Brugger <matthias.bgg@...il.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
Suleiman Souhlal <suleiman@...gle.com>,
Steven Barrett <steven@...uorix.net>,
Oleksandr Natalenko <oleksandr@...alenko.name>,
"Jan Alexander Steffens (heftig)" <heftig@...hlinux.org>,
Qi Zheng <zhengqi.arch@...edance.com>,
Brian Geffon <bgeffon@...gle.com>,
Barry Song <baohua@...nel.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org
Subject: [PATCH v2 3/3] mm-unstable: Multi-gen LRU: Fix can_swap in lru_gen_look_around()
walk->can_swap might be invalid since it's not guaranteed to be
initialized for the particular lruvec. Instead deduce it from the folio
type (anon/file).
Fixes: 018ee47f1489 ("mm: multi-gen LRU: exploit locality in rmap")
Cc: Yu Zhao <yuzhao@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Kalesh Singh <kaleshsingh@...gle.com>
---
Changes in v2:
- Add Fixes tag
mm/vmscan.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 6eecd291756c..b4329f93a682 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -4656,6 +4656,7 @@ void lru_gen_look_around(struct page_vma_mapped_walk *pvmw)
pte_t *pte = pvmw->pte;
unsigned long addr = pvmw->address;
struct folio *folio = pfn_folio(pvmw->pfn);
+ bool can_swap = !folio_is_file_lru(folio);
struct mem_cgroup *memcg = folio_memcg(folio);
struct pglist_data *pgdat = folio_pgdat(folio);
struct lruvec *lruvec = mem_cgroup_lruvec(memcg, pgdat);
@@ -4704,7 +4705,7 @@ void lru_gen_look_around(struct page_vma_mapped_walk *pvmw)
if (!pte_young(ptent))
continue;
- folio = get_pfn_folio(pfn, memcg, pgdat, !walk || walk->can_swap);
+ folio = get_pfn_folio(pfn, memcg, pgdat, can_swap);
if (!folio)
continue;
--
2.41.0.255.g8b1d071c50-goog
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