From 64daa5d818ae3430f0785206b0af13ef528cb9ef Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Thu, 12 May 2022 20:23:03 -0700 Subject: [PATCH] vmscan: convert lazy freeing to folios Remove a hidden call to compound_head(), and account nr_pages instead of a single page. This matches the code in lru_lazyfree_fn() that accounts nr_pages to PGLAZYFREE. Link: https://lkml.kernel.org/r/20220504182857.4013401-12-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Signed-off-by: Andrew Morton --- include/linux/memcontrol.h | 14 ++++++++++++++ mm/vmscan.c | 18 +++++++++--------- 2 files changed, 23 insertions(+), 9 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index fe580cb96..8ea4b54 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1057,6 +1057,15 @@ static inline void count_memcg_page_event(struct page *page, count_memcg_events(memcg, idx, 1); } +static inline void count_memcg_folio_events(struct folio *folio, + enum vm_event_item idx, unsigned long nr) +{ + struct mem_cgroup *memcg = folio_memcg(folio); + + if (memcg) + count_memcg_events(memcg, idx, nr); +} + static inline void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx) { @@ -1494,6 +1503,11 @@ static inline void count_memcg_page_event(struct page *page, { } +static inline void count_memcg_folio_events(struct folio *folio, + enum vm_event_item idx, unsigned long nr) +{ +} + static inline void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx) { diff --git a/mm/vmscan.c b/mm/vmscan.c index 00b985c..972557e 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1902,20 +1902,20 @@ retry: } } - if (PageAnon(page) && !PageSwapBacked(page)) { + if (folio_test_anon(folio) && !folio_test_swapbacked(folio)) { /* follow __remove_mapping for reference */ - if (!page_ref_freeze(page, 1)) + if (!folio_ref_freeze(folio, 1)) goto keep_locked; /* - * The page has only one reference left, which is + * The folio has only one reference left, which is * from the isolation. After the caller puts the - * page back on lru and drops the reference, the - * page will be freed anyway. It doesn't matter - * which lru it goes. So we don't bother checking - * PageDirty here. + * folio back on the lru and drops the reference, the + * folio will be freed anyway. It doesn't matter + * which lru it goes on. So we don't bother checking + * the dirty flag here. */ - count_vm_event(PGLAZYFREED); - count_memcg_page_event(page, PGLAZYFREED); + count_vm_events(PGLAZYFREED, nr_pages); + count_memcg_folio_events(folio, PGLAZYFREED, nr_pages); } else if (!mapping || !__remove_mapping(mapping, folio, true, sc->target_mem_cgroup)) goto keep_locked; -- 2.7.4