Commit 92d0510c authored by Roman Gushchin's avatar Roman Gushchin Committed by Linus Torvalds
Browse files

mm: kmem: switch to nr_pages in (__)memcg_kmem_charge_memcg() 



These functions are charging the given number of kernel pages to the given
memory cgroup.  The number doesn't have to be a power of two.  Let's make
them to take the unsigned int nr_pages as an argument instead of the page
order.

It makes them look consistent with the corresponding uncharge functions
and functions like: mem_cgroup_charge_skmem(memcg, nr_pages).

Signed-off-by: default avatarRoman Gushchin <guro@fb.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Reviewed-by: default avatarShakeel Butt <shakeelb@google.com>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Link: http://lkml.kernel.org/r/20200109202659.752357-5-guro@fb.com


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f4b00eab

include/linux/memcontrol.h

+6 −5
Original line number Diff line number Diff line
@@ -1369,7 +1369,8 @@ void memcg_kmem_put_cache(struct kmem_cache *cachep); 
#ifdef CONFIG_MEMCG_KMEM

int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order);

void __memcg_kmem_uncharge_page(struct page *page, int order);

int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, int order);

int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp,

			      unsigned int nr_pages);

void __memcg_kmem_uncharge_memcg(struct mem_cgroup *memcg,

				 unsigned int nr_pages);
@@ -1408,18 +1409,18 @@ static inline void memcg_kmem_uncharge_page(struct page *page, int order) 
}



static inline int memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp,

					  int order)

					  unsigned int nr_pages)

{

	if (memcg_kmem_enabled())

		return __memcg_kmem_charge_memcg(memcg, gfp, order);

		return __memcg_kmem_charge_memcg(memcg, gfp, nr_pages);

	return 0;

}



static inline void memcg_kmem_uncharge_memcg(struct mem_cgroup *memcg,

					     int order)

					     unsigned int nr_pages)

{

	if (memcg_kmem_enabled())

		__memcg_kmem_uncharge_memcg(memcg, 1 << order);

		__memcg_kmem_uncharge_memcg(memcg, nr_pages);

}



/*

mm/memcontrol.c

+4 −4
Original line number Diff line number Diff line
@@ -2884,13 +2884,13 @@ void memcg_kmem_put_cache(struct kmem_cache *cachep) 
 * __memcg_kmem_charge_memcg: charge a kmem page

 * @memcg: memory cgroup to charge

 * @gfp: reclaim mode

 * @order: allocation order

 * @nr_pages: number of pages to charge

 *

 * Returns 0 on success, an error code on failure.

 */

int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, int order)

int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp,

			      unsigned int nr_pages)

{

	unsigned int nr_pages = 1 << order;

	struct page_counter *counter;

	int ret;
@@ -2934,7 +2934,7 @@ int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order) 


	memcg = get_mem_cgroup_from_current();

	if (!mem_cgroup_is_root(memcg)) {

		ret = __memcg_kmem_charge_memcg(memcg, gfp, order);

		ret = __memcg_kmem_charge_memcg(memcg, gfp, 1 << order);

		if (!ret) {

			page->mem_cgroup = memcg;

			__SetPageKmemcg(page);

mm/slab.h

+1 −1
Original line number Diff line number Diff line
@@ -365,7 +365,7 @@ static __always_inline int memcg_charge_slab(struct page *page, 
		return 0;

	}



	ret = memcg_kmem_charge_memcg(memcg, gfp, order);

	ret = memcg_kmem_charge_memcg(memcg, gfp, 1 << order);

	if (ret)

		goto out;

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