slab common: add functions for kmem_cache_node access (44c5356f) · Commits · 戴 / test

The patchset provides two new functions in mm/slab.h and modifies SLAB and SLUB to use these. The kmem_cache_node structure is shared between both allocators and the use of common accessors will allow us to move more code into slab_common.c in the future. This patch (of 3): These functions allow to eliminate repeatedly used code in both SLAB and SLUB and also allow for the insertion of debugging code that may be needed in the development process. Signed-off-by:

Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Acked-by:

David Rientjes <rientjes@google.com> Acked-by:

Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

mm/slab.h

+16 −1

Original line number	Diff line number	Diff line
		@@ -262,7 +262,7 @@ static inline struct kmem_cache cache_from_obj(struct kmem_cache s, void *x)
		}
		#endif


		#ifndef CONFIG_SLOB
		/*
		* The slab lists for all objects.
		*/
		@@ -294,5 +294,20 @@ struct kmem_cache_node {

		};

		static inline struct kmem_cache_node get_node(struct kmem_cache s, int node)
		{
		return s->node[node];
		}

		/*
		* Iterator over all nodes. The body will be executed for each node that has
		* a kmem_cache_node structure allocated (which is true for all online nodes)
		*/
		#define for_each_kmem_cache_node(__s, __node, __n) \
		for (__node = 0; __n = get_node(__s, __node), __node < nr_node_ids; __node++) \
		if (__n)

		#endif

		void slab_next(struct seq_file m, void p, loff_t pos);
		void slab_stop(struct seq_file m, void p);

mm/slub.c

+0 −5

Original line number	Diff line number	Diff line
		@@ -233,11 +233,6 @@ static inline void stat(const struct kmem_cache *s, enum stat_item si)
		* Core slab cache functions
		*******************************************************************/

		static inline struct kmem_cache_node get_node(struct kmem_cache s, int node)
		{
		return s->node[node];
		}

		/* Verify that a pointer has an address that is valid within a slab page */
		static inline int check_valid_pointer(struct kmem_cache *s,
		struct page page, const void object)

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