From: Zi Yan ziy@nvidia.com
It sets memcg information for the pages after the split. A new parameter new_nr is added to tell the number of subpages in the new page, always 1 for now. It prepares for upcoming changes to support split huge page to any lower order.
Signed-off-by: Zi Yan ziy@nvidia.com --- include/linux/memcontrol.h | 5 +++-- mm/huge_memory.c | 2 +- mm/memcontrol.c | 8 ++++---- mm/page_alloc.c | 2 +- 4 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index aa69ea98e2d8..ee1021129142 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1151,7 +1151,7 @@ static inline void memcg_memory_event_mm(struct mm_struct *mm, rcu_read_unlock(); }
-void split_page_memcg(struct page *head, unsigned int nr); +void split_page_memcg(struct page *head, unsigned int nr, unsigned int new_nr);
unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, gfp_t gfp_mask, @@ -1588,7 +1588,8 @@ void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx) { }
-static inline void split_page_memcg(struct page *head, unsigned int nr) +static inline void split_page_memcg(struct page *head, unsigned int nr, + unsigned int new_nr) { }
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 81a5689806af..30e3e300c42e 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2515,7 +2515,7 @@ static void __split_huge_page(struct page *page, struct list_head *list, int i;
/* complete memcg works before add pages to LRU */ - split_page_memcg(head, nr); + split_page_memcg(head, nr, 1);
if (PageAnon(head) && PageSwapCache(head)) { swp_entry_t entry = { .val = page_private(head) }; diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 681e7528a714..8e505201baf0 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3414,7 +3414,7 @@ void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size) /* * Because page_memcg(head) is not set on tails, set it now. */ -void split_page_memcg(struct page *head, unsigned int nr) +void split_page_memcg(struct page *head, unsigned int nr, unsigned int new_nr) { struct folio *folio = page_folio(head); struct mem_cgroup *memcg = folio_memcg(folio); @@ -3423,13 +3423,13 @@ void split_page_memcg(struct page *head, unsigned int nr) if (mem_cgroup_disabled() || !memcg) return;
- for (i = 1; i < nr; i++) + for (i = new_nr; i < nr; i += new_nr) folio_page(folio, i)->memcg_data = folio->memcg_data;
if (folio_memcg_kmem(folio)) - obj_cgroup_get_many(__folio_objcg(folio), nr - 1); + obj_cgroup_get_many(__folio_objcg(folio), nr / new_nr - 1); else - css_get_many(&memcg->css, nr - 1); + css_get_many(&memcg->css, nr / new_nr - 1); }
#ifdef CONFIG_SWAP diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2e72fdbdd8db..59c2b6696698 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3531,7 +3531,7 @@ void split_page(struct page *page, unsigned int order) for (i = 1; i < (1 << order); i++) set_page_refcounted(page + i); split_page_owner(page, 1 << order); - split_page_memcg(page, 1 << order); + split_page_memcg(page, 1 << order, 1); } EXPORT_SYMBOL_GPL(split_page);