From: Zhou Guanghui zhouguanghui1@huawei.com Subject: mm/memcg: rename mem_cgroup_split_huge_fixup to split_page_memcg and add nr_pages argument

Rename mem_cgroup_split_huge_fixup to split_page_memcg and explicitly pass in page number argument.

In this way, the interface name is more common and can be used by potential users. In addition, the complete info(memcg and flag) of the memcg needs to be set to the tail pages.

Link: https://lkml.kernel.org/r/20210304074053.65527-2-zhouguanghui1@huawei.com Signed-off-by: Zhou Guanghui zhouguanghui1@huawei.com Acked-by: Johannes Weiner hannes@cmpxchg.org Reviewed-by: Zi Yan ziy@nvidia.com Reviewed-by: Shakeel Butt shakeelb@google.com Acked-by: Michal Hocko mhocko@suse.com Cc: Hugh Dickins hughd@google.com Cc: "Kirill A. Shutemov" kirill.shutemov@linux.intel.com Cc: Nicholas Piggin npiggin@gmail.com Cc: Kefeng Wang wangkefeng.wang@huawei.com Cc: Hanjun Guo guohanjun@huawei.com Cc: Tianhong Ding dingtianhong@huawei.com Cc: Weilong Chen chenweilong@huawei.com Cc: Rui Xiang rui.xiang@huawei.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

include/linux/memcontrol.h | 6 ++---- mm/huge_memory.c | 2 +- mm/memcontrol.c | 15 ++++++--------- 3 files changed, 9 insertions(+), 14 deletions(-)

--- a/include/linux/memcontrol.h~mm-memcg-rename-mem_cgroup_split_huge_fixup-to-split_page_memcg +++ a/include/linux/memcontrol.h @@ -1061,9 +1061,7 @@ static inline void memcg_memory_event_mm rcu_read_unlock(); }

-#ifdef CONFIG_TRANSPARENT_HUGEPAGE -void mem_cgroup_split_huge_fixup(struct page *head); -#endif +void split_page_memcg(struct page *head, unsigned int nr);

#else /* CONFIG_MEMCG */

@@ -1400,7 +1398,7 @@ unsigned long mem_cgroup_soft_limit_recl return 0; }

-static inline void mem_cgroup_split_huge_fixup(struct page *head) +static inline void split_page_memcg(struct page *head, unsigned int nr) { }

--- a/mm/huge_memory.c~mm-memcg-rename-mem_cgroup_split_huge_fixup-to-split_page_memcg +++ a/mm/huge_memory.c @@ -2467,7 +2467,7 @@ static void __split_huge_page(struct pag int i;

/* complete memcg works before add pages to LRU */ - mem_cgroup_split_huge_fixup(head); + split_page_memcg(head, nr);

if (PageAnon(head) && PageSwapCache(head)) { swp_entry_t entry = { .val = page_private(head) }; --- a/mm/memcontrol.c~mm-memcg-rename-mem_cgroup_split_huge_fixup-to-split_page_memcg +++ a/mm/memcontrol.c @@ -3287,24 +3287,21 @@ void obj_cgroup_uncharge(struct obj_cgro

#endif /* CONFIG_MEMCG_KMEM */

-#ifdef CONFIG_TRANSPARENT_HUGEPAGE /* - * Because page_memcg(head) is not set on compound tails, set it now. + * Because page_memcg(head) is not set on tails, set it now. */ -void mem_cgroup_split_huge_fixup(struct page *head) +void split_page_memcg(struct page *head, unsigned int nr) { struct mem_cgroup *memcg = page_memcg(head); int i;

- if (mem_cgroup_disabled()) + if (mem_cgroup_disabled() || !memcg) return;

- for (i = 1; i < HPAGE_PMD_NR; i++) { - css_get(&memcg->css); - head[i].memcg_data = (unsigned long)memcg; - } + for (i = 1; i < nr; i++) + head[i].memcg_data = head->memcg_data; + css_get_many(&memcg->css, nr - 1); } -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#ifdef CONFIG_MEMCG_SWAP /** _