diff options
Diffstat (limited to 'include/linux/slab.h')
| -rw-r--r-- | include/linux/slab.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h index 3dd389aa91c7..307bfbe62387 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -242,6 +242,17 @@ struct kmem_cache { #define KMALLOC_MIN_SIZE (1 << KMALLOC_SHIFT_LOW) #endif +/* + * This restriction comes from byte sized index implementation. + * Page size is normally 2^12 bytes and, in this case, if we want to use + * byte sized index which can represent 2^8 entries, the size of the object + * should be equal or greater to 2^12 / 2^8 = 2^4 = 16. + * If minimum size of kmalloc is less than 16, we use it as minimum object + * size and give up to use byte sized index. + */ +#define SLAB_OBJ_MIN_SIZE (KMALLOC_MIN_SIZE < 16 ? \ + (KMALLOC_MIN_SIZE) : 16) + #ifndef CONFIG_SLOB extern struct kmem_cache *kmalloc_caches[KMALLOC_SHIFT_HIGH + 1]; #ifdef CONFIG_ZONE_DMA |