Commit 8456a648 authored by Joonsoo Kim's avatar Joonsoo Kim Committed by Pekka Enberg
Browse files

slab: use struct page for slab management 



Now, there are a few field in struct slab, so we can overload these
over struct page. This will save some memory and reduce cache footprint.

After this change, slabp_cache and slab_size no longer related to
a struct slab, so rename them as freelist_cache and freelist_size.

These changes are just mechanical ones and there is no functional change.

Acked-by: default avatarAndi Kleen <ak@linux.intel.com>
Acked-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: default avatarPekka Enberg <penberg@iki.fi>
parent 106a74e1

include/linux/mm_types.h

+13 −8
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ struct page { 
	/* First double word block */

	unsigned long flags;		/* Atomic flags, some possibly

					 * updated asynchronously */

	union {

		struct address_space *mapping;	/* If low bit clear, points to

						 * inode address_space, or NULL.

						 * If page mapped as anonymous
@@ -49,11 +50,14 @@ struct page { 
						 * it points to anon_vma object:

						 * see PAGE_MAPPING_ANON below.

						 */

		void *s_mem;			/* slab first object */

	};



	/* Second double word */

	struct {

		union {

			pgoff_t index;		/* Our offset within mapping. */

			void *freelist;		/* slub/slob first free object */

			void *freelist;		/* sl[aou]b first free object */

			bool pfmemalloc;	/* If set by the page allocator,

						 * ALLOC_NO_WATERMARKS was set

						 * and the low watermark was not
@@ -109,6 +113,7 @@ struct page { 
				};

				atomic_t _count;		/* Usage count, see below. */

			};

			unsigned int active;	/* SLAB */

		};

	};

include/linux/slab_def.h

+2 −2
Original line number Diff line number Diff line
@@ -41,8 +41,8 @@ struct kmem_cache { 


	size_t colour;			/* cache colouring range */

	unsigned int colour_off;	/* colour offset */

	struct kmem_cache *slabp_cache;

	unsigned int slab_size;

	struct kmem_cache *freelist_cache;

	unsigned int freelist_size;



	/* constructor func */

	void (*ctor)(void *obj);

mm/slab.c

+143 −163

File changed.

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