diff options
author | Christoph Lameter <clameter@sgi.com> | 2007-02-10 10:43:10 +0100 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-11 19:51:18 +0100 |
commit | 4b51d66989218aad731a721b5b28c79bf5388c09 (patch) | |
tree | 8ff7acbd219f699c20c2f1fd201ffb3db5a64062 /mm | |
parent | [PATCH] optional ZONE_DMA: introduce CONFIG_ZONE_DMA (diff) | |
download | linux-4b51d66989218aad731a721b5b28c79bf5388c09.tar.xz linux-4b51d66989218aad731a721b5b28c79bf5388c09.zip |
[PATCH] optional ZONE_DMA: optional ZONE_DMA in the VM
Make ZONE_DMA optional in core code.
- ifdef all code for ZONE_DMA and related definitions following the example
for ZONE_DMA32 and ZONE_HIGHMEM.
- Without ZONE_DMA, ZONE_HIGHMEM and ZONE_DMA32 we get to a ZONES_SHIFT of
0.
- Modify the VM statistics to work correctly without a DMA zone.
- Modify slab to not create DMA slabs if there is no ZONE_DMA.
[akpm@osdl.org: cleanup]
[jdike@addtoit.com: build fix]
[apw@shadowen.org: Simplify calculation of the number of bits we need for ZONES_SHIFT]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <willy@debian.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r-- | mm/Kconfig | 6 | ||||
-rw-r--r-- | mm/page_alloc.c | 4 | ||||
-rw-r--r-- | mm/slab.c | 20 | ||||
-rw-r--r-- | mm/vmstat.c | 8 |
4 files changed, 30 insertions, 8 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 50f7cfc15b78..79360cf519bf 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -161,3 +161,9 @@ config RESOURCES_64BIT default 64BIT help This option allows memory and IO resources to be 64 bit. + +config ZONE_DMA_FLAG + int + default "0" if !ZONE_DMA + default "1" + diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 6cff13840c6d..d461b23a27a1 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -73,7 +73,9 @@ static void __free_pages_ok(struct page *page, unsigned int order); * don't need any ZONE_NORMAL reservation */ int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { +#ifdef CONFIG_ZONE_DMA 256, +#endif #ifdef CONFIG_ZONE_DMA32 256, #endif @@ -85,7 +87,9 @@ int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { EXPORT_SYMBOL(totalram_pages); static char * const zone_names[MAX_NR_ZONES] = { +#ifdef CONFIG_ZONE_DMA "DMA", +#endif #ifdef CONFIG_ZONE_DMA32 "DMA32", #endif diff --git a/mm/slab.c b/mm/slab.c index caa8f87e04eb..348396d691a1 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -793,8 +793,10 @@ static inline struct kmem_cache *__find_general_cachep(size_t size, * has cs_{dma,}cachep==NULL. Thus no special case * for large kmalloc calls required. */ +#ifdef CONFIG_ZONE_DMA if (unlikely(gfpflags & GFP_DMA)) return csizep->cs_dmacachep; +#endif return csizep->cs_cachep; } @@ -1493,13 +1495,15 @@ void __init kmem_cache_init(void) ARCH_KMALLOC_FLAGS|SLAB_PANIC, NULL, NULL); } - - sizes->cs_dmacachep = kmem_cache_create(names->name_dma, +#ifdef CONFIG_ZONE_DMA + sizes->cs_dmacachep = kmem_cache_create( + names->name_dma, sizes->cs_size, ARCH_KMALLOC_MINALIGN, ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| SLAB_PANIC, NULL, NULL); +#endif sizes++; names++; } @@ -2321,7 +2325,7 @@ kmem_cache_create (const char *name, size_t size, size_t align, cachep->slab_size = slab_size; cachep->flags = flags; cachep->gfpflags = 0; - if (flags & SLAB_CACHE_DMA) + if (CONFIG_ZONE_DMA_FLAG && (flags & SLAB_CACHE_DMA)) cachep->gfpflags |= GFP_DMA; cachep->buffer_size = size; cachep->reciprocal_buffer_size = reciprocal_value(size); @@ -2643,10 +2647,12 @@ static void cache_init_objs(struct kmem_cache *cachep, static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags) { - if (flags & GFP_DMA) - BUG_ON(!(cachep->gfpflags & GFP_DMA)); - else - BUG_ON(cachep->gfpflags & GFP_DMA); + if (CONFIG_ZONE_DMA_FLAG) { + if (flags & GFP_DMA) + BUG_ON(!(cachep->gfpflags & GFP_DMA)); + else + BUG_ON(cachep->gfpflags & GFP_DMA); + } } static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, diff --git a/mm/vmstat.c b/mm/vmstat.c index 5ffa8c27ead8..6c488d6ac425 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -408,6 +408,12 @@ const struct seq_operations fragmentation_op = { .show = frag_show, }; +#ifdef CONFIG_ZONE_DMA +#define TEXT_FOR_DMA(xx) xx "_dma", +#else +#define TEXT_FOR_DMA(xx) +#endif + #ifdef CONFIG_ZONE_DMA32 #define TEXT_FOR_DMA32(xx) xx "_dma32", #else @@ -420,7 +426,7 @@ const struct seq_operations fragmentation_op = { #define TEXT_FOR_HIGHMEM(xx) #endif -#define TEXTS_FOR_ZONES(xx) xx "_dma", TEXT_FOR_DMA32(xx) xx "_normal", \ +#define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \ TEXT_FOR_HIGHMEM(xx) static const char * const vmstat_text[] = { |