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mm: memcg: make memcg huge page split support any order split

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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>
This commit is contained in:
Zi Yan 2024-02-26 15:55:31 -05:00 committed by Andrew Morton
parent 9a581c12cd
commit b8791381d7
4 changed files with 11 additions and 10 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
include/linux/memcontrol.h
View file

@ -1163,7 +1163,7 @@ 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,
@ -1621,7 +1621,7 @@ 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)
{
}

2
mm/huge_memory.c
View file

@ -2894,7 +2894,7 @@ 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);

11
mm/memcontrol.c
View file

@ -3606,23 +3606,24 @@ 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

4
mm/page_alloc.c
View file

@ -2617,7 +2617,7 @@ 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);
@ -4802,7 +4802,7 @@ 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);