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authorChristoph Lameter <clameter@sgi.com>2008-04-14 20:11:40 +0400
committerPekka Enberg <penberg@cs.helsinki.fi>2008-04-27 19:28:18 +0400
commit65c3376aaca96c66aa76014aaf430398964b68cb (patch)
tree9cd8d64a2cf211e76afbad0de5ec1484af6bfafb /include/linux
parent205ab99dd103e3dd5b0964dad8a16dfe2db69b2e (diff)
downloadlinux-65c3376aaca96c66aa76014aaf430398964b68cb.tar.xz
slub: Fallback to minimal order during slab page allocation
If any higher order allocation fails then fall back the smallest order necessary to contain at least one object. This enables fallback for all allocations to order 0 pages. The fallback will waste more memory (objects will not fit neatly) and the fallback slabs will be not as efficient as larger slabs since they contain less objects. Note that SLAB also depends on order 1 allocations for some slabs that waste too much memory if forced into PAGE_SIZE'd page. SLUB now can now deal with failing order 1 allocs which SLAB cannot do. Add a new field min that will contain the objects for the smallest possible order for a slab cache. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/slub_def.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 4236b5dee812..71e43a12ebbb 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -29,6 +29,7 @@ enum stat_item {
DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
+ ORDER_FALLBACK, /* Number of times fallback was necessary */
NR_SLUB_STAT_ITEMS };
struct kmem_cache_cpu {
@@ -81,6 +82,7 @@ struct kmem_cache {
/* Allocation and freeing of slabs */
struct kmem_cache_order_objects max;
+ struct kmem_cache_order_objects min;
gfp_t allocflags; /* gfp flags to use on each alloc */
int refcount; /* Refcount for slab cache destroy */
void (*ctor)(struct kmem_cache *, void *);