diff options
| -rw-r--r-- | arch/blackfin/Kconfig | 8 | ||||
| -rw-r--r-- | arch/frv/Kconfig | 8 | ||||
| -rw-r--r-- | arch/m68knommu/Kconfig | 8 | ||||
| -rw-r--r-- | arch/v850/Kconfig | 8 | ||||
| -rw-r--r-- | include/linux/kmalloc_sizes.h | 20 | ||||
| -rw-r--r-- | include/linux/slab.h | 15 | ||||
| -rw-r--r-- | include/linux/slub_def.h | 19 | ||||
| -rw-r--r-- | mm/slab.c | 19 |
8 files changed, 34 insertions, 71 deletions
diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig index 1a4930509325..d80e5b1d686e 100644 --- a/arch/blackfin/Kconfig +++ b/arch/blackfin/Kconfig @@ -560,14 +560,6 @@ endchoice source "mm/Kconfig" -config LARGE_ALLOCS - bool "Allow allocating large blocks (> 1MB) of memory" - help - Allow the slab memory allocator to keep chains for very large - memory sizes - upto 32MB. You may need this if your system has - a lot of RAM, and you need to able to allocate very large - contiguous chunks. If unsure, say N. - config BFIN_DMA_5XX bool "Enable DMA Support" depends on (BF533 || BF532 || BF531 || BF537 || BF536 || BF534 || BF561) diff --git a/arch/frv/Kconfig b/arch/frv/Kconfig index 114738a45582..74eef7111f2b 100644 --- a/arch/frv/Kconfig +++ b/arch/frv/Kconfig @@ -102,14 +102,6 @@ config HIGHPTE with a lot of RAM, this can be wasteful of precious low memory. Setting this option will put user-space page tables in high memory. -config LARGE_ALLOCS - bool "Allow allocating large blocks (> 1MB) of memory" - help - Allow the slab memory allocator to keep chains for very large memory - sizes - up to 32MB. You may need this if your system has a lot of - RAM, and you need to able to allocate very large contiguous chunks. - If unsure, say N. - source "mm/Kconfig" choice diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig index 823f73736bb5..adc64a2bafbb 100644 --- a/arch/m68knommu/Kconfig +++ b/arch/m68knommu/Kconfig @@ -470,14 +470,6 @@ config AVNET default y depends on (AVNET5282) -config LARGE_ALLOCS - bool "Allow allocating large blocks (> 1MB) of memory" - help - Allow the slab memory allocator to keep chains for very large - memory sizes - upto 32MB. You may need this if your system has - a lot of RAM, and you need to able to allocate very large - contiguous chunks. If unsure, say N. - config 4KSTACKS bool "Use 4Kb for kernel stacks instead of 8Kb" default y diff --git a/arch/v850/Kconfig b/arch/v850/Kconfig index 5f54c1236c18..ace479ab273f 100644 --- a/arch/v850/Kconfig +++ b/arch/v850/Kconfig @@ -240,14 +240,6 @@ menu "Processor type and features" config RESET_GUARD bool "Reset Guard" - config LARGE_ALLOCS - bool "Allow allocating large blocks (> 1MB) of memory" - help - Allow the slab memory allocator to keep chains for very large - memory sizes - upto 32MB. You may need this if your system has - a lot of RAM, and you need to able to allocate very large - contiguous chunks. If unsure, say N. - source "mm/Kconfig" endmenu diff --git a/include/linux/kmalloc_sizes.h b/include/linux/kmalloc_sizes.h index bda23e00ed71..e576b848ce10 100644 --- a/include/linux/kmalloc_sizes.h +++ b/include/linux/kmalloc_sizes.h @@ -19,17 +19,27 @@ CACHE(32768) CACHE(65536) CACHE(131072) -#if (NR_CPUS > 512) || (MAX_NUMNODES > 256) || !defined(CONFIG_MMU) +#if KMALLOC_MAX_SIZE >= 262144 CACHE(262144) #endif -#ifndef CONFIG_MMU +#if KMALLOC_MAX_SIZE >= 524288 CACHE(524288) +#endif +#if KMALLOC_MAX_SIZE >= 1048576 CACHE(1048576) -#ifdef CONFIG_LARGE_ALLOCS +#endif +#if KMALLOC_MAX_SIZE >= 2097152 CACHE(2097152) +#endif +#if KMALLOC_MAX_SIZE >= 4194304 CACHE(4194304) +#endif +#if KMALLOC_MAX_SIZE >= 8388608 CACHE(8388608) +#endif +#if KMALLOC_MAX_SIZE >= 16777216 CACHE(16777216) +#endif +#if KMALLOC_MAX_SIZE >= 33554432 CACHE(33554432) -#endif /* CONFIG_LARGE_ALLOCS */ -#endif /* CONFIG_MMU */ +#endif diff --git a/include/linux/slab.h b/include/linux/slab.h index 6fb2ae214152..a015236cc572 100644 --- a/include/linux/slab.h +++ b/include/linux/slab.h @@ -74,6 +74,21 @@ static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep, #endif /* + * The largest kmalloc size supported by the slab allocators is + * 32 megabyte (2^25) or the maximum allocatable page order if that is + * less than 32 MB. + * + * WARNING: Its not easy to increase this value since the allocators have + * to do various tricks to work around compiler limitations in order to + * ensure proper constant folding. + */ +#define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT) <= 25 ? \ + (MAX_ORDER + PAGE_SHIFT) : 25) + +#define KMALLOC_MAX_SIZE (1UL << KMALLOC_SHIFT_HIGH) +#define KMALLOC_MAX_ORDER (KMALLOC_SHIFT_HIGH - PAGE_SHIFT) + +/* * Common kmalloc functions provided by all allocators */ void *__kmalloc(size_t, gfp_t); diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index a9fb92862aaa..0764c829d967 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -58,17 +58,6 @@ struct kmem_cache { */ #define KMALLOC_SHIFT_LOW 3 -#ifdef CONFIG_LARGE_ALLOCS -#define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT) =< 25 ? \ - (MAX_ORDER + PAGE_SHIFT - 1) : 25) -#else -#if !defined(CONFIG_MMU) || NR_CPUS > 512 || MAX_NUMNODES > 256 -#define KMALLOC_SHIFT_HIGH 20 -#else -#define KMALLOC_SHIFT_HIGH 18 -#endif -#endif - /* * We keep the general caches in an array of slab caches that are used for * 2^x bytes of allocations. @@ -79,7 +68,7 @@ extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1]; * Sorry that the following has to be that ugly but some versions of GCC * have trouble with constant propagation and loops. */ -static inline int kmalloc_index(int size) +static inline int kmalloc_index(size_t size) { /* * We should return 0 if size == 0 but we use the smallest object @@ -87,7 +76,7 @@ static inline int kmalloc_index(int size) */ WARN_ON_ONCE(size == 0); - if (size > (1 << KMALLOC_SHIFT_HIGH)) + if (size > KMALLOC_MAX_SIZE) return -1; if (size > 64 && size <= 96) @@ -110,17 +99,13 @@ static inline int kmalloc_index(int size) if (size <= 64 * 1024) return 16; if (size <= 128 * 1024) return 17; if (size <= 256 * 1024) return 18; -#if KMALLOC_SHIFT_HIGH > 18 if (size <= 512 * 1024) return 19; if (size <= 1024 * 1024) return 20; -#endif -#if KMALLOC_SHIFT_HIGH > 20 if (size <= 2 * 1024 * 1024) return 21; if (size <= 4 * 1024 * 1024) return 22; if (size <= 8 * 1024 * 1024) return 23; if (size <= 16 * 1024 * 1024) return 24; if (size <= 32 * 1024 * 1024) return 25; -#endif return -1; /* diff --git a/mm/slab.c b/mm/slab.c index 1dc0ce1d0d5d..528243e15cc8 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -569,21 +569,6 @@ static void **dbg_userword(struct kmem_cache *cachep, void *objp) #endif /* - * Maximum size of an obj (in 2^order pages) and absolute limit for the gfp - * order. - */ -#if defined(CONFIG_LARGE_ALLOCS) -#define MAX_OBJ_ORDER 13 /* up to 32Mb */ -#define MAX_GFP_ORDER 13 /* up to 32Mb */ -#elif defined(CONFIG_MMU) -#define MAX_OBJ_ORDER 5 /* 32 pages */ -#define MAX_GFP_ORDER 5 /* 32 pages */ -#else -#define MAX_OBJ_ORDER 8 /* up to 1Mb */ -#define MAX_GFP_ORDER 8 /* up to 1Mb */ -#endif - -/* * Do not go above this order unless 0 objects fit into the slab. */ #define BREAK_GFP_ORDER_HI 1 @@ -2002,7 +1987,7 @@ static size_t calculate_slab_order(struct kmem_cache *cachep, size_t left_over = 0; int gfporder; - for (gfporder = 0; gfporder <= MAX_GFP_ORDER; gfporder++) { + for (gfporder = 0; gfporder <= KMALLOC_MAX_ORDER; gfporder++) { unsigned int num; size_t remainder; @@ -2148,7 +2133,7 @@ kmem_cache_create (const char *name, size_t size, size_t align, * Sanity checks... these are all serious usage bugs. */ if (!name || in_interrupt() || (size < BYTES_PER_WORD) || - (size > (1 << MAX_OBJ_ORDER) * PAGE_SIZE) || dtor) { + size > KMALLOC_MAX_SIZE || dtor) { printk(KERN_ERR "%s: Early error in slab %s\n", __FUNCTION__, name); BUG(); |