bdc8cb9845
See the "fixup bad_range()" patch for more information, but this actually creates a the lock to protect things making assumptions about a zone's size staying constant at runtime. Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
638 lines
19 KiB
C
638 lines
19 KiB
C
#ifndef _LINUX_MMZONE_H
|
|
#define _LINUX_MMZONE_H
|
|
|
|
#ifdef __KERNEL__
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/list.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/threads.h>
|
|
#include <linux/numa.h>
|
|
#include <linux/init.h>
|
|
#include <linux/seqlock.h>
|
|
#include <asm/atomic.h>
|
|
|
|
/* Free memory management - zoned buddy allocator. */
|
|
#ifndef CONFIG_FORCE_MAX_ZONEORDER
|
|
#define MAX_ORDER 11
|
|
#else
|
|
#define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER
|
|
#endif
|
|
|
|
struct free_area {
|
|
struct list_head free_list;
|
|
unsigned long nr_free;
|
|
};
|
|
|
|
struct pglist_data;
|
|
|
|
/*
|
|
* zone->lock and zone->lru_lock are two of the hottest locks in the kernel.
|
|
* So add a wild amount of padding here to ensure that they fall into separate
|
|
* cachelines. There are very few zone structures in the machine, so space
|
|
* consumption is not a concern here.
|
|
*/
|
|
#if defined(CONFIG_SMP)
|
|
struct zone_padding {
|
|
char x[0];
|
|
} ____cacheline_maxaligned_in_smp;
|
|
#define ZONE_PADDING(name) struct zone_padding name;
|
|
#else
|
|
#define ZONE_PADDING(name)
|
|
#endif
|
|
|
|
struct per_cpu_pages {
|
|
int count; /* number of pages in the list */
|
|
int low; /* low watermark, refill needed */
|
|
int high; /* high watermark, emptying needed */
|
|
int batch; /* chunk size for buddy add/remove */
|
|
struct list_head list; /* the list of pages */
|
|
};
|
|
|
|
struct per_cpu_pageset {
|
|
struct per_cpu_pages pcp[2]; /* 0: hot. 1: cold */
|
|
#ifdef CONFIG_NUMA
|
|
unsigned long numa_hit; /* allocated in intended node */
|
|
unsigned long numa_miss; /* allocated in non intended node */
|
|
unsigned long numa_foreign; /* was intended here, hit elsewhere */
|
|
unsigned long interleave_hit; /* interleaver prefered this zone */
|
|
unsigned long local_node; /* allocation from local node */
|
|
unsigned long other_node; /* allocation from other node */
|
|
#endif
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
#ifdef CONFIG_NUMA
|
|
#define zone_pcp(__z, __cpu) ((__z)->pageset[(__cpu)])
|
|
#else
|
|
#define zone_pcp(__z, __cpu) (&(__z)->pageset[(__cpu)])
|
|
#endif
|
|
|
|
#define ZONE_DMA 0
|
|
#define ZONE_NORMAL 1
|
|
#define ZONE_HIGHMEM 2
|
|
|
|
#define MAX_NR_ZONES 3 /* Sync this with ZONES_SHIFT */
|
|
#define ZONES_SHIFT 2 /* ceil(log2(MAX_NR_ZONES)) */
|
|
|
|
|
|
/*
|
|
* When a memory allocation must conform to specific limitations (such
|
|
* as being suitable for DMA) the caller will pass in hints to the
|
|
* allocator in the gfp_mask, in the zone modifier bits. These bits
|
|
* are used to select a priority ordered list of memory zones which
|
|
* match the requested limits. GFP_ZONEMASK defines which bits within
|
|
* the gfp_mask should be considered as zone modifiers. Each valid
|
|
* combination of the zone modifier bits has a corresponding list
|
|
* of zones (in node_zonelists). Thus for two zone modifiers there
|
|
* will be a maximum of 4 (2 ** 2) zonelists, for 3 modifiers there will
|
|
* be 8 (2 ** 3) zonelists. GFP_ZONETYPES defines the number of possible
|
|
* combinations of zone modifiers in "zone modifier space".
|
|
*/
|
|
#define GFP_ZONEMASK 0x03
|
|
/*
|
|
* As an optimisation any zone modifier bits which are only valid when
|
|
* no other zone modifier bits are set (loners) should be placed in
|
|
* the highest order bits of this field. This allows us to reduce the
|
|
* extent of the zonelists thus saving space. For example in the case
|
|
* of three zone modifier bits, we could require up to eight zonelists.
|
|
* If the left most zone modifier is a "loner" then the highest valid
|
|
* zonelist would be four allowing us to allocate only five zonelists.
|
|
* Use the first form when the left most bit is not a "loner", otherwise
|
|
* use the second.
|
|
*/
|
|
/* #define GFP_ZONETYPES (GFP_ZONEMASK + 1) */ /* Non-loner */
|
|
#define GFP_ZONETYPES ((GFP_ZONEMASK + 1) / 2 + 1) /* Loner */
|
|
|
|
/*
|
|
* On machines where it is needed (eg PCs) we divide physical memory
|
|
* into multiple physical zones. On a PC we have 3 zones:
|
|
*
|
|
* ZONE_DMA < 16 MB ISA DMA capable memory
|
|
* ZONE_NORMAL 16-896 MB direct mapped by the kernel
|
|
* ZONE_HIGHMEM > 896 MB only page cache and user processes
|
|
*/
|
|
|
|
struct zone {
|
|
/* Fields commonly accessed by the page allocator */
|
|
unsigned long free_pages;
|
|
unsigned long pages_min, pages_low, pages_high;
|
|
/*
|
|
* We don't know if the memory that we're going to allocate will be freeable
|
|
* or/and it will be released eventually, so to avoid totally wasting several
|
|
* GB of ram we must reserve some of the lower zone memory (otherwise we risk
|
|
* to run OOM on the lower zones despite there's tons of freeable ram
|
|
* on the higher zones). This array is recalculated at runtime if the
|
|
* sysctl_lowmem_reserve_ratio sysctl changes.
|
|
*/
|
|
unsigned long lowmem_reserve[MAX_NR_ZONES];
|
|
|
|
#ifdef CONFIG_NUMA
|
|
struct per_cpu_pageset *pageset[NR_CPUS];
|
|
#else
|
|
struct per_cpu_pageset pageset[NR_CPUS];
|
|
#endif
|
|
/*
|
|
* free areas of different sizes
|
|
*/
|
|
spinlock_t lock;
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
/* see spanned/present_pages for more description */
|
|
seqlock_t span_seqlock;
|
|
#endif
|
|
struct free_area free_area[MAX_ORDER];
|
|
|
|
|
|
ZONE_PADDING(_pad1_)
|
|
|
|
/* Fields commonly accessed by the page reclaim scanner */
|
|
spinlock_t lru_lock;
|
|
struct list_head active_list;
|
|
struct list_head inactive_list;
|
|
unsigned long nr_scan_active;
|
|
unsigned long nr_scan_inactive;
|
|
unsigned long nr_active;
|
|
unsigned long nr_inactive;
|
|
unsigned long pages_scanned; /* since last reclaim */
|
|
int all_unreclaimable; /* All pages pinned */
|
|
|
|
/*
|
|
* Does the allocator try to reclaim pages from the zone as soon
|
|
* as it fails a watermark_ok() in __alloc_pages?
|
|
*/
|
|
int reclaim_pages;
|
|
/* A count of how many reclaimers are scanning this zone */
|
|
atomic_t reclaim_in_progress;
|
|
|
|
/*
|
|
* prev_priority holds the scanning priority for this zone. It is
|
|
* defined as the scanning priority at which we achieved our reclaim
|
|
* target at the previous try_to_free_pages() or balance_pgdat()
|
|
* invokation.
|
|
*
|
|
* We use prev_priority as a measure of how much stress page reclaim is
|
|
* under - it drives the swappiness decision: whether to unmap mapped
|
|
* pages.
|
|
*
|
|
* temp_priority is used to remember the scanning priority at which
|
|
* this zone was successfully refilled to free_pages == pages_high.
|
|
*
|
|
* Access to both these fields is quite racy even on uniprocessor. But
|
|
* it is expected to average out OK.
|
|
*/
|
|
int temp_priority;
|
|
int prev_priority;
|
|
|
|
|
|
ZONE_PADDING(_pad2_)
|
|
/* Rarely used or read-mostly fields */
|
|
|
|
/*
|
|
* wait_table -- the array holding the hash table
|
|
* wait_table_size -- the size of the hash table array
|
|
* wait_table_bits -- wait_table_size == (1 << wait_table_bits)
|
|
*
|
|
* The purpose of all these is to keep track of the people
|
|
* waiting for a page to become available and make them
|
|
* runnable again when possible. The trouble is that this
|
|
* consumes a lot of space, especially when so few things
|
|
* wait on pages at a given time. So instead of using
|
|
* per-page waitqueues, we use a waitqueue hash table.
|
|
*
|
|
* The bucket discipline is to sleep on the same queue when
|
|
* colliding and wake all in that wait queue when removing.
|
|
* When something wakes, it must check to be sure its page is
|
|
* truly available, a la thundering herd. The cost of a
|
|
* collision is great, but given the expected load of the
|
|
* table, they should be so rare as to be outweighed by the
|
|
* benefits from the saved space.
|
|
*
|
|
* __wait_on_page_locked() and unlock_page() in mm/filemap.c, are the
|
|
* primary users of these fields, and in mm/page_alloc.c
|
|
* free_area_init_core() performs the initialization of them.
|
|
*/
|
|
wait_queue_head_t * wait_table;
|
|
unsigned long wait_table_size;
|
|
unsigned long wait_table_bits;
|
|
|
|
/*
|
|
* Discontig memory support fields.
|
|
*/
|
|
struct pglist_data *zone_pgdat;
|
|
struct page *zone_mem_map;
|
|
/* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */
|
|
unsigned long zone_start_pfn;
|
|
|
|
/*
|
|
* zone_start_pfn, spanned_pages and present_pages are all
|
|
* protected by span_seqlock. It is a seqlock because it has
|
|
* to be read outside of zone->lock, and it is done in the main
|
|
* allocator path. But, it is written quite infrequently.
|
|
*
|
|
* The lock is declared along with zone->lock because it is
|
|
* frequently read in proximity to zone->lock. It's good to
|
|
* give them a chance of being in the same cacheline.
|
|
*/
|
|
unsigned long spanned_pages; /* total size, including holes */
|
|
unsigned long present_pages; /* amount of memory (excluding holes) */
|
|
|
|
/*
|
|
* rarely used fields:
|
|
*/
|
|
char *name;
|
|
} ____cacheline_maxaligned_in_smp;
|
|
|
|
|
|
/*
|
|
* The "priority" of VM scanning is how much of the queues we will scan in one
|
|
* go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the
|
|
* queues ("queue_length >> 12") during an aging round.
|
|
*/
|
|
#define DEF_PRIORITY 12
|
|
|
|
/*
|
|
* One allocation request operates on a zonelist. A zonelist
|
|
* is a list of zones, the first one is the 'goal' of the
|
|
* allocation, the other zones are fallback zones, in decreasing
|
|
* priority.
|
|
*
|
|
* Right now a zonelist takes up less than a cacheline. We never
|
|
* modify it apart from boot-up, and only a few indices are used,
|
|
* so despite the zonelist table being relatively big, the cache
|
|
* footprint of this construct is very small.
|
|
*/
|
|
struct zonelist {
|
|
struct zone *zones[MAX_NUMNODES * MAX_NR_ZONES + 1]; // NULL delimited
|
|
};
|
|
|
|
|
|
/*
|
|
* The pg_data_t structure is used in machines with CONFIG_DISCONTIGMEM
|
|
* (mostly NUMA machines?) to denote a higher-level memory zone than the
|
|
* zone denotes.
|
|
*
|
|
* On NUMA machines, each NUMA node would have a pg_data_t to describe
|
|
* it's memory layout.
|
|
*
|
|
* Memory statistics and page replacement data structures are maintained on a
|
|
* per-zone basis.
|
|
*/
|
|
struct bootmem_data;
|
|
typedef struct pglist_data {
|
|
struct zone node_zones[MAX_NR_ZONES];
|
|
struct zonelist node_zonelists[GFP_ZONETYPES];
|
|
int nr_zones;
|
|
#ifdef CONFIG_FLAT_NODE_MEM_MAP
|
|
struct page *node_mem_map;
|
|
#endif
|
|
struct bootmem_data *bdata;
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
/*
|
|
* Must be held any time you expect node_start_pfn, node_present_pages
|
|
* or node_spanned_pages stay constant. Holding this will also
|
|
* guarantee that any pfn_valid() stays that way.
|
|
*
|
|
* Nests above zone->lock and zone->size_seqlock.
|
|
*/
|
|
spinlock_t node_size_lock;
|
|
#endif
|
|
unsigned long node_start_pfn;
|
|
unsigned long node_present_pages; /* total number of physical pages */
|
|
unsigned long node_spanned_pages; /* total size of physical page
|
|
range, including holes */
|
|
int node_id;
|
|
struct pglist_data *pgdat_next;
|
|
wait_queue_head_t kswapd_wait;
|
|
struct task_struct *kswapd;
|
|
int kswapd_max_order;
|
|
} pg_data_t;
|
|
|
|
#define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages)
|
|
#define node_spanned_pages(nid) (NODE_DATA(nid)->node_spanned_pages)
|
|
#ifdef CONFIG_FLAT_NODE_MEM_MAP
|
|
#define pgdat_page_nr(pgdat, pagenr) ((pgdat)->node_mem_map + (pagenr))
|
|
#else
|
|
#define pgdat_page_nr(pgdat, pagenr) pfn_to_page((pgdat)->node_start_pfn + (pagenr))
|
|
#endif
|
|
#define nid_page_nr(nid, pagenr) pgdat_page_nr(NODE_DATA(nid),(pagenr))
|
|
|
|
#include <linux/memory_hotplug.h>
|
|
|
|
extern struct pglist_data *pgdat_list;
|
|
|
|
void __get_zone_counts(unsigned long *active, unsigned long *inactive,
|
|
unsigned long *free, struct pglist_data *pgdat);
|
|
void get_zone_counts(unsigned long *active, unsigned long *inactive,
|
|
unsigned long *free);
|
|
void build_all_zonelists(void);
|
|
void wakeup_kswapd(struct zone *zone, int order);
|
|
int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
|
|
int alloc_type, int can_try_harder, gfp_t gfp_high);
|
|
|
|
#ifdef CONFIG_HAVE_MEMORY_PRESENT
|
|
void memory_present(int nid, unsigned long start, unsigned long end);
|
|
#else
|
|
static inline void memory_present(int nid, unsigned long start, unsigned long end) {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NEED_NODE_MEMMAP_SIZE
|
|
unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
|
|
#endif
|
|
|
|
/*
|
|
* zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc.
|
|
*/
|
|
#define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones)
|
|
|
|
/**
|
|
* for_each_pgdat - helper macro to iterate over all nodes
|
|
* @pgdat - pointer to a pg_data_t variable
|
|
*
|
|
* Meant to help with common loops of the form
|
|
* pgdat = pgdat_list;
|
|
* while(pgdat) {
|
|
* ...
|
|
* pgdat = pgdat->pgdat_next;
|
|
* }
|
|
*/
|
|
#define for_each_pgdat(pgdat) \
|
|
for (pgdat = pgdat_list; pgdat; pgdat = pgdat->pgdat_next)
|
|
|
|
/*
|
|
* next_zone - helper magic for for_each_zone()
|
|
* Thanks to William Lee Irwin III for this piece of ingenuity.
|
|
*/
|
|
static inline struct zone *next_zone(struct zone *zone)
|
|
{
|
|
pg_data_t *pgdat = zone->zone_pgdat;
|
|
|
|
if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
|
|
zone++;
|
|
else if (pgdat->pgdat_next) {
|
|
pgdat = pgdat->pgdat_next;
|
|
zone = pgdat->node_zones;
|
|
} else
|
|
zone = NULL;
|
|
|
|
return zone;
|
|
}
|
|
|
|
/**
|
|
* for_each_zone - helper macro to iterate over all memory zones
|
|
* @zone - pointer to struct zone variable
|
|
*
|
|
* The user only needs to declare the zone variable, for_each_zone
|
|
* fills it in. This basically means for_each_zone() is an
|
|
* easier to read version of this piece of code:
|
|
*
|
|
* for (pgdat = pgdat_list; pgdat; pgdat = pgdat->node_next)
|
|
* for (i = 0; i < MAX_NR_ZONES; ++i) {
|
|
* struct zone * z = pgdat->node_zones + i;
|
|
* ...
|
|
* }
|
|
* }
|
|
*/
|
|
#define for_each_zone(zone) \
|
|
for (zone = pgdat_list->node_zones; zone; zone = next_zone(zone))
|
|
|
|
static inline int is_highmem_idx(int idx)
|
|
{
|
|
return (idx == ZONE_HIGHMEM);
|
|
}
|
|
|
|
static inline int is_normal_idx(int idx)
|
|
{
|
|
return (idx == ZONE_NORMAL);
|
|
}
|
|
/**
|
|
* is_highmem - helper function to quickly check if a struct zone is a
|
|
* highmem zone or not. This is an attempt to keep references
|
|
* to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum.
|
|
* @zone - pointer to struct zone variable
|
|
*/
|
|
static inline int is_highmem(struct zone *zone)
|
|
{
|
|
return zone == zone->zone_pgdat->node_zones + ZONE_HIGHMEM;
|
|
}
|
|
|
|
static inline int is_normal(struct zone *zone)
|
|
{
|
|
return zone == zone->zone_pgdat->node_zones + ZONE_NORMAL;
|
|
}
|
|
|
|
/* These two functions are used to setup the per zone pages min values */
|
|
struct ctl_table;
|
|
struct file;
|
|
int min_free_kbytes_sysctl_handler(struct ctl_table *, int, struct file *,
|
|
void __user *, size_t *, loff_t *);
|
|
extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1];
|
|
int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *, int, struct file *,
|
|
void __user *, size_t *, loff_t *);
|
|
|
|
#include <linux/topology.h>
|
|
/* Returns the number of the current Node. */
|
|
#define numa_node_id() (cpu_to_node(raw_smp_processor_id()))
|
|
|
|
#ifndef CONFIG_NEED_MULTIPLE_NODES
|
|
|
|
extern struct pglist_data contig_page_data;
|
|
#define NODE_DATA(nid) (&contig_page_data)
|
|
#define NODE_MEM_MAP(nid) mem_map
|
|
#define MAX_NODES_SHIFT 1
|
|
#define pfn_to_nid(pfn) (0)
|
|
|
|
#else /* CONFIG_NEED_MULTIPLE_NODES */
|
|
|
|
#include <asm/mmzone.h>
|
|
|
|
#endif /* !CONFIG_NEED_MULTIPLE_NODES */
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
#include <asm/sparsemem.h>
|
|
#endif
|
|
|
|
#if BITS_PER_LONG == 32 || defined(ARCH_HAS_ATOMIC_UNSIGNED)
|
|
/*
|
|
* with 32 bit page->flags field, we reserve 8 bits for node/zone info.
|
|
* there are 3 zones (2 bits) and this leaves 8-2=6 bits for nodes.
|
|
*/
|
|
#define FLAGS_RESERVED 8
|
|
|
|
#elif BITS_PER_LONG == 64
|
|
/*
|
|
* with 64 bit flags field, there's plenty of room.
|
|
*/
|
|
#define FLAGS_RESERVED 32
|
|
|
|
#else
|
|
|
|
#error BITS_PER_LONG not defined
|
|
|
|
#endif
|
|
|
|
#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
|
|
#define early_pfn_to_nid(nid) (0UL)
|
|
#endif
|
|
|
|
#define pfn_to_section_nr(pfn) ((pfn) >> PFN_SECTION_SHIFT)
|
|
#define section_nr_to_pfn(sec) ((sec) << PFN_SECTION_SHIFT)
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
|
|
/*
|
|
* SECTION_SHIFT #bits space required to store a section #
|
|
*
|
|
* PA_SECTION_SHIFT physical address to/from section number
|
|
* PFN_SECTION_SHIFT pfn to/from section number
|
|
*/
|
|
#define SECTIONS_SHIFT (MAX_PHYSMEM_BITS - SECTION_SIZE_BITS)
|
|
|
|
#define PA_SECTION_SHIFT (SECTION_SIZE_BITS)
|
|
#define PFN_SECTION_SHIFT (SECTION_SIZE_BITS - PAGE_SHIFT)
|
|
|
|
#define NR_MEM_SECTIONS (1UL << SECTIONS_SHIFT)
|
|
|
|
#define PAGES_PER_SECTION (1UL << PFN_SECTION_SHIFT)
|
|
#define PAGE_SECTION_MASK (~(PAGES_PER_SECTION-1))
|
|
|
|
#if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS
|
|
#error Allocator MAX_ORDER exceeds SECTION_SIZE
|
|
#endif
|
|
|
|
struct page;
|
|
struct mem_section {
|
|
/*
|
|
* This is, logically, a pointer to an array of struct
|
|
* pages. However, it is stored with some other magic.
|
|
* (see sparse.c::sparse_init_one_section())
|
|
*
|
|
* Making it a UL at least makes someone do a cast
|
|
* before using it wrong.
|
|
*/
|
|
unsigned long section_mem_map;
|
|
};
|
|
|
|
#ifdef CONFIG_SPARSEMEM_EXTREME
|
|
#define SECTIONS_PER_ROOT (PAGE_SIZE / sizeof (struct mem_section))
|
|
#else
|
|
#define SECTIONS_PER_ROOT 1
|
|
#endif
|
|
|
|
#define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT)
|
|
#define NR_SECTION_ROOTS (NR_MEM_SECTIONS / SECTIONS_PER_ROOT)
|
|
#define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1)
|
|
|
|
#ifdef CONFIG_SPARSEMEM_EXTREME
|
|
extern struct mem_section *mem_section[NR_SECTION_ROOTS];
|
|
#else
|
|
extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
|
|
#endif
|
|
|
|
static inline struct mem_section *__nr_to_section(unsigned long nr)
|
|
{
|
|
if (!mem_section[SECTION_NR_TO_ROOT(nr)])
|
|
return NULL;
|
|
return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK];
|
|
}
|
|
extern int __section_nr(struct mem_section* ms);
|
|
|
|
/*
|
|
* We use the lower bits of the mem_map pointer to store
|
|
* a little bit of information. There should be at least
|
|
* 3 bits here due to 32-bit alignment.
|
|
*/
|
|
#define SECTION_MARKED_PRESENT (1UL<<0)
|
|
#define SECTION_HAS_MEM_MAP (1UL<<1)
|
|
#define SECTION_MAP_LAST_BIT (1UL<<2)
|
|
#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1))
|
|
|
|
static inline struct page *__section_mem_map_addr(struct mem_section *section)
|
|
{
|
|
unsigned long map = section->section_mem_map;
|
|
map &= SECTION_MAP_MASK;
|
|
return (struct page *)map;
|
|
}
|
|
|
|
static inline int valid_section(struct mem_section *section)
|
|
{
|
|
return (section && (section->section_mem_map & SECTION_MARKED_PRESENT));
|
|
}
|
|
|
|
static inline int section_has_mem_map(struct mem_section *section)
|
|
{
|
|
return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP));
|
|
}
|
|
|
|
static inline int valid_section_nr(unsigned long nr)
|
|
{
|
|
return valid_section(__nr_to_section(nr));
|
|
}
|
|
|
|
/*
|
|
* Given a kernel address, find the home node of the underlying memory.
|
|
*/
|
|
#define kvaddr_to_nid(kaddr) pfn_to_nid(__pa(kaddr) >> PAGE_SHIFT)
|
|
|
|
static inline struct mem_section *__pfn_to_section(unsigned long pfn)
|
|
{
|
|
return __nr_to_section(pfn_to_section_nr(pfn));
|
|
}
|
|
|
|
#define pfn_to_page(pfn) \
|
|
({ \
|
|
unsigned long __pfn = (pfn); \
|
|
__section_mem_map_addr(__pfn_to_section(__pfn)) + __pfn; \
|
|
})
|
|
#define page_to_pfn(page) \
|
|
({ \
|
|
page - __section_mem_map_addr(__nr_to_section( \
|
|
page_to_section(page))); \
|
|
})
|
|
|
|
static inline int pfn_valid(unsigned long pfn)
|
|
{
|
|
if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
|
|
return 0;
|
|
return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
|
|
}
|
|
|
|
/*
|
|
* These are _only_ used during initialisation, therefore they
|
|
* can use __initdata ... They could have names to indicate
|
|
* this restriction.
|
|
*/
|
|
#ifdef CONFIG_NUMA
|
|
#define pfn_to_nid early_pfn_to_nid
|
|
#endif
|
|
|
|
#define pfn_to_pgdat(pfn) \
|
|
({ \
|
|
NODE_DATA(pfn_to_nid(pfn)); \
|
|
})
|
|
|
|
#define early_pfn_valid(pfn) pfn_valid(pfn)
|
|
void sparse_init(void);
|
|
#else
|
|
#define sparse_init() do {} while (0)
|
|
#define sparse_index_init(_sec, _nid) do {} while (0)
|
|
#endif /* CONFIG_SPARSEMEM */
|
|
|
|
#ifdef CONFIG_NODES_SPAN_OTHER_NODES
|
|
#define early_pfn_in_nid(pfn, nid) (early_pfn_to_nid(pfn) == (nid))
|
|
#else
|
|
#define early_pfn_in_nid(pfn, nid) (1)
|
|
#endif
|
|
|
|
#ifndef early_pfn_valid
|
|
#define early_pfn_valid(pfn) (1)
|
|
#endif
|
|
|
|
void memory_present(int nid, unsigned long start, unsigned long end);
|
|
unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_MMZONE_H */
|