2c85f51d22
This is being done by allowing boot time allocations to specify that they
may want a sub-page sized amount of memory.
Overall this seems more consistent with the other hash table allocations,
and allows making two supposedly mm-only variables really mm-only
(nr_{kernel,all}_pages).
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
159 lines
4.7 KiB
C
159 lines
4.7 KiB
C
/*
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* Discontiguous memory support, Kanoj Sarcar, SGI, Nov 1999
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*/
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#ifndef _LINUX_BOOTMEM_H
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#define _LINUX_BOOTMEM_H
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#include <linux/mmzone.h>
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#include <asm/dma.h>
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/*
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* simple boot-time physical memory area allocator.
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*/
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extern unsigned long max_low_pfn;
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extern unsigned long min_low_pfn;
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/*
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* highest page
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*/
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extern unsigned long max_pfn;
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#ifdef CONFIG_CRASH_DUMP
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extern unsigned long saved_max_pfn;
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#endif
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/*
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* node_bootmem_map is a map pointer - the bits represent all physical
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* memory pages (including holes) on the node.
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*/
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typedef struct bootmem_data {
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unsigned long node_min_pfn;
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unsigned long node_low_pfn;
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void *node_bootmem_map;
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unsigned long last_end_off;
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unsigned long hint_idx;
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struct list_head list;
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} bootmem_data_t;
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extern bootmem_data_t bootmem_node_data[];
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extern unsigned long bootmem_bootmap_pages(unsigned long);
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extern unsigned long init_bootmem_node(pg_data_t *pgdat,
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unsigned long freepfn,
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unsigned long startpfn,
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unsigned long endpfn);
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extern unsigned long init_bootmem(unsigned long addr, unsigned long memend);
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extern unsigned long free_all_bootmem_node(pg_data_t *pgdat);
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extern unsigned long free_all_bootmem(void);
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extern void free_bootmem_node(pg_data_t *pgdat,
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unsigned long addr,
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unsigned long size);
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extern void free_bootmem(unsigned long addr, unsigned long size);
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/*
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* Flags for reserve_bootmem (also if CONFIG_HAVE_ARCH_BOOTMEM_NODE,
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* the architecture-specific code should honor this).
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*
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* If flags is 0, then the return value is always 0 (success). If
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* flags contains BOOTMEM_EXCLUSIVE, then -EBUSY is returned if the
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* memory already was reserved.
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*/
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#define BOOTMEM_DEFAULT 0
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#define BOOTMEM_EXCLUSIVE (1<<0)
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extern int reserve_bootmem(unsigned long addr,
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unsigned long size,
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int flags);
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extern int reserve_bootmem_node(pg_data_t *pgdat,
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unsigned long physaddr,
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unsigned long size,
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int flags);
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extern void *__alloc_bootmem(unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem_nopanic(unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem_node(pg_data_t *pgdat,
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unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem_node_nopanic(pg_data_t *pgdat,
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unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem_low(unsigned long size,
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unsigned long align,
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unsigned long goal);
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extern void *__alloc_bootmem_low_node(pg_data_t *pgdat,
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unsigned long size,
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unsigned long align,
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unsigned long goal);
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#define alloc_bootmem(x) \
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__alloc_bootmem(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_nopanic(x) \
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__alloc_bootmem_nopanic(x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_pages(x) \
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__alloc_bootmem(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_pages_nopanic(x) \
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__alloc_bootmem_nopanic(x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_node(pgdat, x) \
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__alloc_bootmem_node(pgdat, x, SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_pages_node(pgdat, x) \
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__alloc_bootmem_node(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_pages_node_nopanic(pgdat, x) \
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__alloc_bootmem_node_nopanic(pgdat, x, PAGE_SIZE, __pa(MAX_DMA_ADDRESS))
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#define alloc_bootmem_low(x) \
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__alloc_bootmem_low(x, SMP_CACHE_BYTES, 0)
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#define alloc_bootmem_low_pages(x) \
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__alloc_bootmem_low(x, PAGE_SIZE, 0)
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#define alloc_bootmem_low_pages_node(pgdat, x) \
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__alloc_bootmem_low_node(pgdat, x, PAGE_SIZE, 0)
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extern int reserve_bootmem_generic(unsigned long addr, unsigned long size,
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int flags);
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extern void *alloc_bootmem_section(unsigned long size,
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unsigned long section_nr);
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#ifdef CONFIG_HAVE_ARCH_ALLOC_REMAP
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extern void *alloc_remap(int nid, unsigned long size);
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#else
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static inline void *alloc_remap(int nid, unsigned long size)
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{
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return NULL;
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}
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#endif /* CONFIG_HAVE_ARCH_ALLOC_REMAP */
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extern void *alloc_large_system_hash(const char *tablename,
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unsigned long bucketsize,
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unsigned long numentries,
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int scale,
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int flags,
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unsigned int *_hash_shift,
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unsigned int *_hash_mask,
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unsigned long limit);
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#define HASH_EARLY 0x00000001 /* Allocating during early boot? */
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#define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min
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* shift passed via *_hash_shift */
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/* Only NUMA needs hash distribution. 64bit NUMA architectures have
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* sufficient vmalloc space.
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*/
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#if defined(CONFIG_NUMA) && defined(CONFIG_64BIT)
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#define HASHDIST_DEFAULT 1
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#else
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#define HASHDIST_DEFAULT 0
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#endif
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extern int hashdist; /* Distribute hashes across NUMA nodes? */
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#endif /* _LINUX_BOOTMEM_H */
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