Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 484748f0 authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

slab: infrastructure for bulk object allocation and freeing 



Add the basic infrastructure for alloc/free operations on pointer arrays.
It includes a generic function in the common slab code that is used in
this infrastructure patch to create the unoptimized functionality for slab
bulk operations.

Allocators can then provide optimized allocation functions for situations
in which large numbers of objects are needed.  These optimization may
avoid taking locks repeatedly and bypass metadata creation if all objects
in slab pages can be used to provide the objects required.

Allocators can extend the skeletons provided and add their own code to the
bulk alloc and free functions.  They can keep the generic allocation and
freeing and just fall back to those if optimizations would not work (like
for example when debugging is on).

Signed-off-by: default avatarChristoph Lameter <cl@linux.com>
Signed-off-by: default avatarJesper Dangaard Brouer <brouer@redhat.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2ae44005

include/linux/slab.h

+10 −0
Original line number Diff line number Diff line
@@ -290,6 +290,16 @@ void *__kmalloc(size_t size, gfp_t flags); 
void *kmem_cache_alloc(struct kmem_cache *, gfp_t flags);

void kmem_cache_free(struct kmem_cache *, void *);



/*

 * Bulk allocation and freeing operations. These are accellerated in an

 * allocator specific way to avoid taking locks repeatedly or building

 * metadata structures unnecessarily.

 *

 * Note that interrupts must be enabled when calling these functions.

 */

void kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);

bool kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);



#ifdef CONFIG_NUMA

void *__kmalloc_node(size_t size, gfp_t flags, int node);

void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);

mm/slab.c

+13 −0
Original line number Diff line number Diff line
@@ -3416,6 +3416,19 @@ void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) 
}

EXPORT_SYMBOL(kmem_cache_alloc);



void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)

{

	__kmem_cache_free_bulk(s, size, p);

}

EXPORT_SYMBOL(kmem_cache_free_bulk);



bool kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,

								void **p)

{

	return __kmem_cache_alloc_bulk(s, flags, size, p);

}

EXPORT_SYMBOL(kmem_cache_alloc_bulk);



#ifdef CONFIG_TRACING

void *

kmem_cache_alloc_trace(struct kmem_cache *cachep, gfp_t flags, size_t size)

mm/slab.h

+9 −0
Original line number Diff line number Diff line
@@ -163,6 +163,15 @@ void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *s); 
ssize_t slabinfo_write(struct file *file, const char __user *buffer,

		       size_t count, loff_t *ppos);



/*

 * Generic implementation of bulk operations

 * These are useful for situations in which the allocator cannot

 * perform optimizations. In that case segments of the objecct listed

 * may be allocated or freed using these operations.

 */

void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);

bool __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);



#ifdef CONFIG_MEMCG_KMEM

/*

 * Iterate over all memcg caches of the given root cache. The caller must hold

mm/slab_common.c

+23 −0
Original line number Diff line number Diff line
@@ -104,6 +104,29 @@ static inline int kmem_cache_sanity_check(const char *name, size_t size) 
}

#endif



void __kmem_cache_free_bulk(struct kmem_cache *s, size_t nr, void **p)

{

	size_t i;



	for (i = 0; i < nr; i++)

		kmem_cache_free(s, p[i]);

}



bool __kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t nr,

								void **p)

{

	size_t i;



	for (i = 0; i < nr; i++) {

		void *x = p[i] = kmem_cache_alloc(s, flags);

		if (!x) {

			__kmem_cache_free_bulk(s, i, p);

			return false;

		}

	}

	return true;

}



#ifdef CONFIG_MEMCG_KMEM

void slab_init_memcg_params(struct kmem_cache *s)

{

mm/slob.c

+13 −0
Original line number Diff line number Diff line
@@ -611,6 +611,19 @@ void kmem_cache_free(struct kmem_cache *c, void *b) 
}

EXPORT_SYMBOL(kmem_cache_free);



void kmem_cache_free_bulk(struct kmem_cache *s, size_t size, void **p)

{

	__kmem_cache_free_bulk(s, size, p);

}

EXPORT_SYMBOL(kmem_cache_free_bulk);



bool kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,

								void **p)

{

	return __kmem_cache_alloc_bulk(s, flags, size, p);

}

EXPORT_SYMBOL(kmem_cache_alloc_bulk);



int __kmem_cache_shutdown(struct kmem_cache *c)

{

	/* No way to check for remaining objects */