From: Zi Yan ziy@nvidia.com
mainline inclusion from mainline-v6.9-rc1 commit b8791381d7edae3706edde207f52d9e483ed400c category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I9OCYO CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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It sets memcg information for the pages after the split. A new parameter new_order is added to tell the order of subpages in the new page, always 0 for now. It prepares for upcoming changes to support split huge page to any lower order.
Link: https://lkml.kernel.org/r/20240226205534.1603748-6-zi.yan@sent.com Signed-off-by: Zi Yan ziy@nvidia.com Acked-by: David Hildenbrand david@redhat.com Cc: Hugh Dickins hughd@google.com Cc: Kirill A. Shutemov kirill.shutemov@linux.intel.com Cc: Luis Chamberlain mcgrof@kernel.org Cc: "Matthew Wilcox (Oracle)" willy@infradead.org Cc: Michal Koutny mkoutny@suse.com Cc: Roman Gushchin roman.gushchin@linux.dev Cc: Ryan Roberts ryan.roberts@arm.com Cc: Yang Shi shy828301@gmail.com Cc: Yu Zhao yuzhao@google.com Cc: Zach O'Keefe zokeefe@google.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Liu Shixin liushixin2@huawei.com --- include/linux/memcontrol.h | 4 ++-- mm/huge_memory.c | 2 +- mm/memcontrol.c | 11 ++++++----- mm/page_alloc.c | 4 ++-- 4 files changed, 11 insertions(+), 10 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 830d4a67fe9b..8c199fe368c2 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1278,7 +1278,7 @@ static inline void memcg_memory_event_mm(struct mm_struct *mm, rcu_read_unlock(); }
-void split_page_memcg(struct page *head, int order); +void split_page_memcg(struct page *head, int old_order, int new_order);
unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order, gfp_t gfp_mask, @@ -1742,7 +1742,7 @@ void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx) { }
-static inline void split_page_memcg(struct page *head, int order) +static inline void split_page_memcg(struct page *head, int old_order, int new_order) { }
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 96620dec3311..9f7b29f3b10c 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2761,7 +2761,7 @@ static void __split_huge_page(struct page *page, struct list_head *list, unsigned int nr = 1 << order;
/* complete memcg works before add pages to LRU */ - split_page_memcg(head, order); + split_page_memcg(head, order, 0);
if (folio_test_anon(folio) && folio_test_swapcache(folio)) { offset = swp_offset(folio->swap); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 9768adeb2110..f1cf73835cba 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3657,23 +3657,24 @@ 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, int order) +void split_page_memcg(struct page *head, int old_order, int new_order) { struct folio *folio = page_folio(head); struct mem_cgroup *memcg = folio_memcg(folio); int i; - unsigned int nr = 1 << order; + unsigned int old_nr = 1 << old_order; + unsigned int new_nr = 1 << new_order;
if (mem_cgroup_disabled() || !memcg) return;
- for (i = 1; i < nr; i++) + for (i = new_nr; i < old_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), old_nr / new_nr - 1); else - css_get_many(&memcg->css, nr - 1); + css_get_many(&memcg->css, old_nr / new_nr - 1); }
#ifdef CONFIG_SWAP diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f241b2fdc09f..fc3286da1eec 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2661,7 +2661,7 @@ 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, order); - split_page_memcg(page, order); + split_page_memcg(page, order, 0); } EXPORT_SYMBOL_GPL(split_page);
@@ -5055,7 +5055,7 @@ static void *make_alloc_exact(unsigned long addr, unsigned int order, struct page *last = page + nr;
split_page_owner(page, order); - split_page_memcg(page, order); + split_page_memcg(page, order, 0); while (page < --last) set_page_refcounted(last);