Commit f4b00eab authored by Roman Gushchin's avatar Roman Gushchin Committed by Linus Torvalds
Browse files

mm: kmem: rename memcg_kmem_(un)charge() into memcg_kmem_(un)charge_page() 



Rename (__)memcg_kmem_(un)charge() into (__)memcg_kmem_(un)charge_page()
to better reflect what they are actually doing:

1) call __memcg_kmem_(un)charge_memcg() to actually charge or uncharge
   the current memcg

2) set or clear the PageKmemcg flag

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/20200109202659.752357-4-guro@fb.com


Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 50591183

fs/pipe.c

+1 −1
Original line number Diff line number Diff line
@@ -146,7 +146,7 @@ static int anon_pipe_buf_steal(struct pipe_inode_info *pipe, 
	struct page *page = buf->page;



	if (page_count(page) == 1) {

		memcg_kmem_uncharge(page, 0);

		memcg_kmem_uncharge_page(page, 0);

		__SetPageLocked(page);

		return 0;

	}

include/linux/memcontrol.h

+13 −10
Original line number Diff line number Diff line
@@ -1367,8 +1367,8 @@ struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep); 
void memcg_kmem_put_cache(struct kmem_cache *cachep);



#ifdef CONFIG_MEMCG_KMEM

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

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

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);

void __memcg_kmem_uncharge_memcg(struct mem_cgroup *memcg,

				 unsigned int nr_pages);
@@ -1393,17 +1393,18 @@ static inline bool memcg_kmem_enabled(void) 
	return static_branch_unlikely(&memcg_kmem_enabled_key);

}



static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order)

static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,

					 int order)

{

	if (memcg_kmem_enabled())

		return __memcg_kmem_charge(page, gfp, order);

		return __memcg_kmem_charge_page(page, gfp, order);

	return 0;

}



static inline void memcg_kmem_uncharge(struct page *page, int order)

static inline void memcg_kmem_uncharge_page(struct page *page, int order)

{

	if (memcg_kmem_enabled())

		__memcg_kmem_uncharge(page, order);

		__memcg_kmem_uncharge_page(page, order);

}



static inline int memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp,
@@ -1435,21 +1436,23 @@ struct mem_cgroup *mem_cgroup_from_obj(void *p); 


#else



static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order)

static inline int memcg_kmem_charge_page(struct page *page, gfp_t gfp,

					 int order)

{

	return 0;

}



static inline void memcg_kmem_uncharge(struct page *page, int order)

static inline void memcg_kmem_uncharge_page(struct page *page, int order)

{

}



static inline int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order)

static inline int __memcg_kmem_charge_page(struct page *page, gfp_t gfp,

					   int order)

{

	return 0;

}



static inline void __memcg_kmem_uncharge(struct page *page, int order)

static inline void __memcg_kmem_uncharge_page(struct page *page, int order)

{

}

kernel/fork.c

+5 −4
Original line number Diff line number Diff line
@@ -281,7 +281,7 @@ static inline void free_thread_stack(struct task_struct *tsk) 
					     MEMCG_KERNEL_STACK_KB,

					     -(int)(PAGE_SIZE / 1024));



			memcg_kmem_uncharge(vm->pages[i], 0);

			memcg_kmem_uncharge_page(vm->pages[i], 0);

		}



		for (i = 0; i < NR_CACHED_STACKS; i++) {
@@ -413,12 +413,13 @@ static int memcg_charge_kernel_stack(struct task_struct *tsk) 


		for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {

			/*

			 * If memcg_kmem_charge() fails, page->mem_cgroup

			 * pointer is NULL, and both memcg_kmem_uncharge()

			 * If memcg_kmem_charge_page() fails, page->mem_cgroup

			 * pointer is NULL, and both memcg_kmem_uncharge_page()

			 * and mod_memcg_page_state() in free_thread_stack()

			 * will ignore this page. So it's safe.

			 */

			ret = memcg_kmem_charge(vm->pages[i], GFP_KERNEL, 0);

			ret = memcg_kmem_charge_page(vm->pages[i], GFP_KERNEL,

						     0);

			if (ret)

				return ret;

mm/memcontrol.c

+4 −4
Original line number Diff line number Diff line
@@ -2917,14 +2917,14 @@ int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, int order) 
}



/**

 * __memcg_kmem_charge: charge a kmem page to the current memory cgroup

 * __memcg_kmem_charge_page: charge a kmem page to the current memory cgroup

 * @page: page to charge

 * @gfp: reclaim mode

 * @order: allocation order

 *

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

 */

int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order)

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

{

	struct mem_cgroup *memcg;

	int ret = 0;
@@ -2960,11 +2960,11 @@ void __memcg_kmem_uncharge_memcg(struct mem_cgroup *memcg, 
		page_counter_uncharge(&memcg->memsw, nr_pages);

}

/**

 * __memcg_kmem_uncharge: uncharge a kmem page

 * __memcg_kmem_uncharge_page: uncharge a kmem page

 * @page: page to uncharge

 * @order: allocation order

 */

void __memcg_kmem_uncharge(struct page *page, int order)

void __memcg_kmem_uncharge_page(struct page *page, int order)

{

	struct mem_cgroup *memcg = page->mem_cgroup;

	unsigned int nr_pages = 1 << order;

mm/page_alloc.c

+2 −2
Original line number Diff line number Diff line
@@ -1153,7 +1153,7 @@ static __always_inline bool free_pages_prepare(struct page *page, 
	if (PageMappingFlags(page))

		page->mapping = NULL;

	if (memcg_kmem_enabled() && PageKmemcg(page))

		__memcg_kmem_uncharge(page, order);

		__memcg_kmem_uncharge_page(page, order);

	if (check_free)

		bad += free_pages_check(page);

	if (bad)
@@ -4753,7 +4753,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid, 


out:

	if (memcg_kmem_enabled() && (gfp_mask & __GFP_ACCOUNT) && page &&

	    unlikely(__memcg_kmem_charge(page, gfp_mask, order) != 0)) {

	    unlikely(__memcg_kmem_charge_page(page, gfp_mask, order) != 0)) {

		__free_pages(page, order);

		page = NULL;

	}

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