![Paul Mundt](/assets/img/avatar_default.png)
This adds preliminary NUMA support to SLOB, primarily aimed at systems with small nodes (tested all the way down to a 128kB SRAM block), whether asymmetric or otherwise. We follow the same conventions as SLAB/SLUB, preferring current node placement for new pages, or with explicit placement, if a node has been specified. Presently on UP NUMA this has the side-effect of preferring node#0 allocations (since numa_node_id() == 0, though this could be reworked if we could hand off a pfn to determine node placement), so single-CPU NUMA systems will want to place smaller nodes further out in terms of node id. Once a page has been bound to a node (via explicit node id typing), we only do block allocations from partial free pages that have a matching node id in the page flags. The current implementation does have some scalability problems, in that all partial free pages are tracked in the global freelist (with contention due to the single spinlock). However, these are things that are being reworked for SMP scalability first, while things like per-node freelists can easily be built on top of this sort of functionality once it's been added. More background can be found in: http://marc.info/?l=linux-mm&m=118117916022379&w=2 http://marc.info/?l=linux-mm&m=118170446306199&w=2 http://marc.info/?l=linux-mm&m=118187859420048&w=2 and subsequent threads. Acked-by: Christoph Lameter <clameter@sgi.com> Acked-by: Matt Mackall <mpm@selenic.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org> Acked-by: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
#ifndef __LINUX_SLOB_DEF_H
|
|
#define __LINUX_SLOB_DEF_H
|
|
|
|
void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
|
|
|
|
static inline void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
|
|
{
|
|
return kmem_cache_alloc_node(cachep, flags, -1);
|
|
}
|
|
|
|
void *__kmalloc_node(size_t size, gfp_t flags, int node);
|
|
|
|
static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
|
|
{
|
|
return __kmalloc_node(size, flags, node);
|
|
}
|
|
|
|
/**
|
|
* kmalloc - allocate memory
|
|
* @size: how many bytes of memory are required.
|
|
* @flags: the type of memory to allocate (see kcalloc).
|
|
*
|
|
* kmalloc is the normal method of allocating memory
|
|
* in the kernel.
|
|
*/
|
|
static inline void *kmalloc(size_t size, gfp_t flags)
|
|
{
|
|
return __kmalloc_node(size, flags, -1);
|
|
}
|
|
|
|
static inline void *__kmalloc(size_t size, gfp_t flags)
|
|
{
|
|
return kmalloc(size, flags);
|
|
}
|
|
|
|
/**
|
|
* kzalloc - allocate memory. The memory is set to zero.
|
|
* @size: how many bytes of memory are required.
|
|
* @flags: the type of memory to allocate (see kcalloc).
|
|
*/
|
|
static inline void *kzalloc(size_t size, gfp_t flags)
|
|
{
|
|
return __kzalloc(size, flags);
|
|
}
|
|
|
|
#endif /* __LINUX_SLOB_DEF_H */
|