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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).

Link: https://lkml.kernel.org/r/20230802025606.346758-3-kaleshsingh@google.com
Fixes: 018ee47f14 ("mm: multi-gen LRU: exploit locality in rmap")
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> [mediatek]
Tested-by: Charan Teja Kalla <quic_charante@quicinc.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Aneesh Kumar K V <aneesh.kumar@linux.ibm.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Brian Geffon <bgeffon@google.com>
Cc: Jan Alexander Steffens (heftig) <heftig@archlinux.org>
Cc: Lecopzer Chen <lecopzer.chen@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Steven Barrett <steven@liquorix.net>
Cc: Suleiman Souhlal <suleiman@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kalesh Singh 2023-08-01 19:56:04 -07:00 committed by Andrew Morton
parent bb5e7f234e
commit a3235ea2a8
1 changed files with 2 additions and 1 deletions
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3
mm/vmscan.c
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@ -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;