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authorChristoph Lameter <clameter@sgi.com>2008-02-14 14:28:09 -0800
committerChristoph Lameter <christoph@stapp.engr.sgi.com>2008-02-14 15:30:02 -0800
commit331dc558fa020451ff773973cee855fd721aa88e (patch)
tree12adf10a7e53c8d07835487694d8180b991304cd /include
parent71c7a06ff0a2ba0434ace4d7aa679537c4211d9d (diff)
slub: Support 4k kmallocs again to compensate for page allocator slowness
Currently we hand off PAGE_SIZEd kmallocs to the page allocator in the mistaken belief that the page allocator can handle these allocations effectively. However, measurements indicate a minimum slowdown by the factor of 8 (and that is only SMP, NUMA is much worse) vs the slub fastpath which causes regressions in tbench. Increase the number of kmalloc caches by one so that we again handle 4k kmallocs directly from slub. 4k page buffering for the page allocator will be performed by slub like done by slab. At some point the page allocator fastpath should be fixed. A lot of the kernel would benefit from a faster ability to allocate a single page. If that is done then the 4k allocs may again be forwarded to the page allocator and this patch could be reverted. Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Christoph Lameter <clameter@sgi.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/slub_def.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 98be113cf93..57deecc79d5 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -111,7 +111,7 @@ struct kmem_cache {
* We keep the general caches in an array of slab caches that are used for
* 2^x bytes of allocations.
*/
-extern struct kmem_cache kmalloc_caches[PAGE_SHIFT];
+extern struct kmem_cache kmalloc_caches[PAGE_SHIFT + 1];
/*
* Sorry that the following has to be that ugly but some versions of GCC
@@ -197,7 +197,7 @@ static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
static __always_inline void *kmalloc(size_t size, gfp_t flags)
{
if (__builtin_constant_p(size)) {
- if (size > PAGE_SIZE / 2)
+ if (size > PAGE_SIZE)
return kmalloc_large(size, flags);
if (!(flags & SLUB_DMA)) {
@@ -219,7 +219,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
if (__builtin_constant_p(size) &&
- size <= PAGE_SIZE / 2 && !(flags & SLUB_DMA)) {
+ size <= PAGE_SIZE && !(flags & SLUB_DMA)) {
struct kmem_cache *s = kmalloc_slab(size);
if (!s)