From 325efb16da2c840e165d9b620fec8049d4d664cc Mon Sep 17 00:00:00 2001 From: Barry Song Date: Mon, 9 Sep 2024 11:21:18 +1200 Subject: [PATCH] mm: add nr argument in mem_cgroup_swapin_uncharge_swap() helper to support large folios With large folios swap-in, we might need to uncharge multiple entries all together, add nr argument in mem_cgroup_swapin_uncharge_swap(). For the existing two users, just pass nr=1. Link: https://lkml.kernel.org/r/20240908232119.2157-3-21cnbao@gmail.com Signed-off-by: Barry Song Acked-by: Chris Li Reviewed-by: Yosry Ahmed Cc: Shakeel Butt Cc: Baolin Wang Cc: Christoph Hellwig Cc: David Hildenbrand Cc: Gao Xiang Cc: "Huang, Ying" Cc: Hugh Dickins Cc: Johannes Weiner Cc: Kairui Song Cc: Kairui Song Cc: Kalesh Singh Cc: Matthew Wilcox (Oracle) Cc: Michal Hocko Cc: Minchan Kim Cc: Nhat Pham Cc: Ryan Roberts Cc: Sergey Senozhatsky Cc: Suren Baghdasaryan Cc: Yang Shi Cc: Chuanhua Han Cc: Kanchana P Sridhar Cc: Usama Arif Signed-off-by: Andrew Morton --- include/linux/memcontrol.h | 5 +++-- mm/memcontrol.c | 7 ++++--- mm/memory.c | 2 +- mm/swap_state.c | 2 +- 4 files changed, 9 insertions(+), 7 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 2ef94c74847d..34d2da05f2f1 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -699,7 +699,8 @@ int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg, gfp_t gfp, int mem_cgroup_swapin_charge_folio(struct folio *folio, struct mm_struct *mm, gfp_t gfp, swp_entry_t entry); -void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry); + +void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry, unsigned int nr_pages); void __mem_cgroup_uncharge(struct folio *folio); @@ -1206,7 +1207,7 @@ static inline int mem_cgroup_swapin_charge_folio(struct folio *folio, return 0; } -static inline void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry) +static inline void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry, unsigned int nr) { } diff --git a/mm/memcontrol.c b/mm/memcontrol.c index d632650c6a2b..ae9a9d7968cb 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4559,14 +4559,15 @@ int mem_cgroup_swapin_charge_folio(struct folio *folio, struct mm_struct *mm, /* * mem_cgroup_swapin_uncharge_swap - uncharge swap slot - * @entry: swap entry for which the page is charged + * @entry: the first swap entry for which the pages are charged + * @nr_pages: number of pages which will be uncharged * * Call this function after successfully adding the charged page to swapcache. * * Note: This function assumes the page for which swap slot is being uncharged * is order 0 page. */ -void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry) +void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry, unsigned int nr_pages) { /* * Cgroup1's unified memory+swap counter has been charged with the @@ -4586,7 +4587,7 @@ void mem_cgroup_swapin_uncharge_swap(swp_entry_t entry) * let's not wait for it. The page already received a * memory+swap charge, drop the swap entry duplicate. */ - mem_cgroup_uncharge_swap(entry, 1); + mem_cgroup_uncharge_swap(entry, nr_pages); } } diff --git a/mm/memory.c b/mm/memory.c index cca3d2907439..9bcc440dd56e 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4104,7 +4104,7 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) ret = VM_FAULT_OOM; goto out_page; } - mem_cgroup_swapin_uncharge_swap(entry); + mem_cgroup_swapin_uncharge_swap(entry, 1); shadow = get_shadow_from_swap_cache(entry); if (shadow) diff --git a/mm/swap_state.c b/mm/swap_state.c index a042720554a7..4669f29cf555 100644 --- a/mm/swap_state.c +++ b/mm/swap_state.c @@ -522,7 +522,7 @@ struct folio *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask, if (add_to_swap_cache(new_folio, entry, gfp_mask & GFP_RECLAIM_MASK, &shadow)) goto fail_unlock; - mem_cgroup_swapin_uncharge_swap(entry); + mem_cgroup_swapin_uncharge_swap(entry, 1); if (shadow) workingset_refault(new_folio, shadow);