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authorPaul Mundt <lethal@linux-sh.org>2007-07-16 02:38:22 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-16 12:05:36 -0400
commit6193a2ff180920f84ee06977165ebf32431fc2d2 (patch)
treed3c6423c50463ea741080a58a2e654cf103431f3 /include/linux/slab_def.h
parentf7977793240d836e60ff413e94e6914f08e10941 (diff)
slob: initial NUMA support
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>
Diffstat (limited to 'include/linux/slab_def.h')
-rw-r--r--include/linux/slab_def.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 8d81a60518e4..365d036c454a 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -25,6 +25,9 @@ struct cache_sizes {
25}; 25};
26extern struct cache_sizes malloc_sizes[]; 26extern struct cache_sizes malloc_sizes[];
27 27
28void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
29void *__kmalloc(size_t size, gfp_t flags);
30
28static inline void *kmalloc(size_t size, gfp_t flags) 31static inline void *kmalloc(size_t size, gfp_t flags)
29{ 32{
30 if (__builtin_constant_p(size)) { 33 if (__builtin_constant_p(size)) {
@@ -79,6 +82,7 @@ found:
79 82
80#ifdef CONFIG_NUMA 83#ifdef CONFIG_NUMA
81extern void *__kmalloc_node(size_t size, gfp_t flags, int node); 84extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
85extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
82 86
83static inline void *kmalloc_node(size_t size, gfp_t flags, int node) 87static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
84{ 88{