From: Zi Yan <[email protected]>
It sets memcg information for the pages after the split. A new parameter
new_order is added to tell the new page order, always 0 for now. It
prepares for upcoming changes to support split huge page to any lower
order.
Signed-off-by: Zi Yan <[email protected]>
---
include/linux/memcontrol.h | 2 +-
mm/huge_memory.c | 2 +-
mm/memcontrol.c | 10 +++++-----
mm/page_alloc.c | 2 +-
4 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 89b14729d59f..e71189454bf0 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1116,7 +1116,7 @@ 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_order);
unsigned long mem_cgroup_soft_limit_reclaim(pg_data_t *pgdat, int order,
gfp_t gfp_mask,
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 2fe38212e07c..640040c386f0 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2371,7 +2371,7 @@ 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, 0);
if (PageAnon(head) && PageSwapCache(head)) {
swp_entry_t entry = { .val = page_private(head) };
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 43b2a22ce812..e7da413ac174 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3262,22 +3262,22 @@ 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_order)
{
struct folio *folio = page_folio(head);
struct mem_cgroup *memcg = folio_memcg(folio);
- int i;
+ int i, new_nr = 1 << new_order;
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_MEMCG_SWAP
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f648decfe39d..d982919b9e51 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3515,7 +3515,7 @@ 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, 0);
}
EXPORT_SYMBOL_GPL(split_page);
--
2.35.1