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[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>
This commit is contained in:
Christoph Lameter 2007-02-10 01:43:10 -08:00 committed by Linus Torvalds
parent 66701b1499
commit 4b51d66989
8 changed files with 90 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/gfp.h
View File

@ -85,8 +85,10 @@ struct vm_area_struct;
static inline enum zone_type gfp_zone(gfp_t flags)
{
#ifdef CONFIG_ZONE_DMA
if (flags & __GFP_DMA)
return ZONE_DMA;
#endif
#ifdef CONFIG_ZONE_DMA32
if (flags & __GFP_DMA32)
return ZONE_DMA32;

26
include/linux/mmzone.h
View File

@ -96,6 +96,7 @@ struct per_cpu_pageset {
#endif
enum zone_type {
#ifdef CONFIG_ZONE_DMA
/*
* ZONE_DMA is used when there are devices that are not able
* to do DMA to all of addressable memory (ZONE_NORMAL). Then we
@ -116,6 +117,7 @@ enum zone_type {
* <16M.
*/
ZONE_DMA,
#endif
#ifdef CONFIG_ZONE_DMA32
/*
* x86_64 needs two ZONE_DMAs because it supports devices that are
@ -152,11 +154,27 @@ enum zone_type {
* match the requested limits. See gfp_zone() in include/linux/gfp.h
*/
#if !defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_HIGHMEM)
/*
* Count the active zones. Note that the use of defined(X) outside
* #if and family is not necessarily defined so ensure we cannot use
* it later. Use __ZONE_COUNT to work out how many shift bits we need.
*/
#define __ZONE_COUNT ( \
defined(CONFIG_ZONE_DMA) \
+ defined(CONFIG_ZONE_DMA32) \
+ 1 \
+ defined(CONFIG_HIGHMEM) \
)
#if __ZONE_COUNT < 2
#define ZONES_SHIFT 0
#elif __ZONE_COUNT <= 2
#define ZONES_SHIFT 1
#else
#elif __ZONE_COUNT <= 4
#define ZONES_SHIFT 2
#else
#error ZONES_SHIFT -- too many zones configured adjust calculation
#endif
#undef __ZONE_COUNT
struct zone {
/* Fields commonly accessed by the page allocator */
@ -523,7 +541,11 @@ static inline int is_dma32(struct zone *zone)
static inline int is_dma(struct zone *zone)
{
#ifdef CONFIG_ZONE_DMA
return zone == zone->zone_pgdat->node_zones + ZONE_DMA;
#else
return 0;
#endif
}
/* These two functions are used to setup the per zone pages min values */

30
include/linux/slab_def.h
View File

@ -19,7 +19,9 @@
struct cache_sizes {
size_t cs_size;
struct kmem_cache *cs_cachep;
#ifdef CONFIG_ZONE_DMA
struct kmem_cache *cs_dmacachep;
#endif
};
extern struct cache_sizes malloc_sizes[];
@ -39,9 +41,12 @@ static inline void *kmalloc(size_t size, gfp_t flags)
__you_cannot_kmalloc_that_much();
}
found:
return kmem_cache_alloc((flags & GFP_DMA) ?
malloc_sizes[i].cs_dmacachep :
malloc_sizes[i].cs_cachep, flags);
#ifdef CONFIG_ZONE_DMA
if (flags & GFP_DMA)
return kmem_cache_alloc(malloc_sizes[i].cs_dmacachep,
flags);
#endif
return kmem_cache_alloc(malloc_sizes[i].cs_cachep, flags);
}
return __kmalloc(size, flags);
}
@ -62,9 +67,12 @@ static inline void *kzalloc(size_t size, gfp_t flags)
__you_cannot_kzalloc_that_much();
}
found:
return kmem_cache_zalloc((flags & GFP_DMA) ?
malloc_sizes[i].cs_dmacachep :
malloc_sizes[i].cs_cachep, flags);
#ifdef CONFIG_ZONE_DMA
if (flags & GFP_DMA)
return kmem_cache_zalloc(malloc_sizes[i].cs_dmacachep,
flags);
#endif
return kmem_cache_zalloc(malloc_sizes[i].cs_cachep, flags);
}
return __kzalloc(size, flags);
}
@ -88,9 +96,13 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
__you_cannot_kmalloc_that_much();
}
found:
return kmem_cache_alloc_node((flags & GFP_DMA) ?
malloc_sizes[i].cs_dmacachep :
malloc_sizes[i].cs_cachep, flags, node);
#ifdef CONFIG_ZONE_DMA
if (flags & GFP_DMA)
return kmem_cache_alloc_node(malloc_sizes[i].cs_dmacachep,
flags, node);
#endif
return kmem_cache_alloc_node(malloc_sizes[i].cs_cachep,
flags, node);
}
return __kmalloc_node(size, flags, node);
}

17
include/linux/vmstat.h
View File

@ -19,6 +19,12 @@
* generated will simply be the increment of a global address.
*/
#ifdef CONFIG_ZONE_DMA
#define DMA_ZONE(xx) xx##_DMA,
#else
#define DMA_ZONE(xx)
#endif
#ifdef CONFIG_ZONE_DMA32
#define DMA32_ZONE(xx) xx##_DMA32,
#else
@ -31,7 +37,7 @@
#define HIGHMEM_ZONE(xx)
#endif
#define FOR_ALL_ZONES(xx) xx##_DMA, DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
#define FOR_ALL_ZONES(xx) DMA_ZONE(xx) DMA32_ZONE(xx) xx##_NORMAL HIGHMEM_ZONE(xx)
enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
FOR_ALL_ZONES(PGALLOC),
@ -96,7 +102,8 @@ static inline void vm_events_fold_cpu(int cpu)
#endif /* CONFIG_VM_EVENT_COUNTERS */
#define __count_zone_vm_events(item, zone, delta) \
__count_vm_events(item##_DMA + zone_idx(zone), delta)
__count_vm_events(item##_NORMAL - ZONE_NORMAL + \
zone_idx(zone), delta)
/*
* Zone based page accounting with per cpu differentials.
@ -143,14 +150,16 @@ static inline unsigned long node_page_state(int node,
struct zone *zones = NODE_DATA(node)->node_zones;
return
#ifdef CONFIG_ZONE_DMA
zone_page_state(&zones[ZONE_DMA], item) +
#endif
#ifdef CONFIG_ZONE_DMA32
zone_page_state(&zones[ZONE_DMA32], item) +
#endif
zone_page_state(&zones[ZONE_NORMAL], item) +
#ifdef CONFIG_HIGHMEM
zone_page_state(&zones[ZONE_HIGHMEM], item) +
#endif
zone_page_state(&zones[ZONE_DMA], item);
zone_page_state(&zones[ZONE_NORMAL], item);
}
extern void zone_statistics(struct zonelist *, struct zone *);

6
mm/Kconfig
View File

@ -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"

4
mm/page_alloc.c
View File

@ -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

12
mm/slab.c
View File

@ -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);
@ -2643,11 +2647,13 @@ static void cache_init_objs(struct kmem_cache *cachep,
static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags)
{
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,
int nodeid)

8
mm/vmstat.c
View File

@ -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[] = {