1479 строки
44 KiB
C
1479 строки
44 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_MMZONE_H
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#define _LINUX_MMZONE_H
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#ifndef __ASSEMBLY__
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#ifndef __GENERATING_BOUNDS_H
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/bitops.h>
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#include <linux/cache.h>
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#include <linux/threads.h>
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#include <linux/numa.h>
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#include <linux/init.h>
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#include <linux/seqlock.h>
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#include <linux/nodemask.h>
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#include <linux/pageblock-flags.h>
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#include <linux/page-flags-layout.h>
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#include <linux/atomic.h>
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#include <linux/mm_types.h>
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#include <linux/page-flags.h>
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#include <asm/page.h>
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/* Free memory management - zoned buddy allocator. */
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#ifndef CONFIG_FORCE_MAX_ZONEORDER
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#define MAX_ORDER 11
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#else
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#define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER
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#endif
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#define MAX_ORDER_NR_PAGES (1 << (MAX_ORDER - 1))
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/*
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* PAGE_ALLOC_COSTLY_ORDER is the order at which allocations are deemed
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* costly to service. That is between allocation orders which should
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* coalesce naturally under reasonable reclaim pressure and those which
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* will not.
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*/
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#define PAGE_ALLOC_COSTLY_ORDER 3
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enum migratetype {
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MIGRATE_UNMOVABLE,
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MIGRATE_MOVABLE,
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MIGRATE_RECLAIMABLE,
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MIGRATE_PCPTYPES, /* the number of types on the pcp lists */
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MIGRATE_HIGHATOMIC = MIGRATE_PCPTYPES,
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#ifdef CONFIG_CMA
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/*
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* MIGRATE_CMA migration type is designed to mimic the way
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* ZONE_MOVABLE works. Only movable pages can be allocated
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* from MIGRATE_CMA pageblocks and page allocator never
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* implicitly change migration type of MIGRATE_CMA pageblock.
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*
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* The way to use it is to change migratetype of a range of
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* pageblocks to MIGRATE_CMA which can be done by
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* __free_pageblock_cma() function. What is important though
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* is that a range of pageblocks must be aligned to
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* MAX_ORDER_NR_PAGES should biggest page be bigger then
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* a single pageblock.
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*/
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MIGRATE_CMA,
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#endif
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#ifdef CONFIG_MEMORY_ISOLATION
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MIGRATE_ISOLATE, /* can't allocate from here */
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#endif
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MIGRATE_TYPES
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};
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/* In mm/page_alloc.c; keep in sync also with show_migration_types() there */
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extern const char * const migratetype_names[MIGRATE_TYPES];
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#ifdef CONFIG_CMA
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# define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA)
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# define is_migrate_cma_page(_page) (get_pageblock_migratetype(_page) == MIGRATE_CMA)
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#else
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# define is_migrate_cma(migratetype) false
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# define is_migrate_cma_page(_page) false
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#endif
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static inline bool is_migrate_movable(int mt)
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{
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return is_migrate_cma(mt) || mt == MIGRATE_MOVABLE;
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}
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#define for_each_migratetype_order(order, type) \
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for (order = 0; order < MAX_ORDER; order++) \
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for (type = 0; type < MIGRATE_TYPES; type++)
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extern int page_group_by_mobility_disabled;
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#define NR_MIGRATETYPE_BITS (PB_migrate_end - PB_migrate + 1)
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#define MIGRATETYPE_MASK ((1UL << NR_MIGRATETYPE_BITS) - 1)
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#define get_pageblock_migratetype(page) \
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get_pfnblock_flags_mask(page, page_to_pfn(page), \
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PB_migrate_end, MIGRATETYPE_MASK)
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struct free_area {
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struct list_head free_list[MIGRATE_TYPES];
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unsigned long nr_free;
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};
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/* Used for pages not on another list */
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static inline void add_to_free_area(struct page *page, struct free_area *area,
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int migratetype)
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{
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list_add(&page->lru, &area->free_list[migratetype]);
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area->nr_free++;
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}
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/* Used for pages not on another list */
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static inline void add_to_free_area_tail(struct page *page, struct free_area *area,
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int migratetype)
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{
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list_add_tail(&page->lru, &area->free_list[migratetype]);
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area->nr_free++;
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}
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#ifdef CONFIG_SHUFFLE_PAGE_ALLOCATOR
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/* Used to preserve page allocation order entropy */
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void add_to_free_area_random(struct page *page, struct free_area *area,
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int migratetype);
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#else
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static inline void add_to_free_area_random(struct page *page,
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struct free_area *area, int migratetype)
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{
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add_to_free_area(page, area, migratetype);
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}
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#endif
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/* Used for pages which are on another list */
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static inline void move_to_free_area(struct page *page, struct free_area *area,
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int migratetype)
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{
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list_move(&page->lru, &area->free_list[migratetype]);
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}
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static inline struct page *get_page_from_free_area(struct free_area *area,
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int migratetype)
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{
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return list_first_entry_or_null(&area->free_list[migratetype],
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struct page, lru);
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}
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static inline void del_page_from_free_area(struct page *page,
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struct free_area *area)
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{
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list_del(&page->lru);
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__ClearPageBuddy(page);
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set_page_private(page, 0);
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area->nr_free--;
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}
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static inline bool free_area_empty(struct free_area *area, int migratetype)
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{
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return list_empty(&area->free_list[migratetype]);
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}
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struct pglist_data;
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/*
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* zone->lock and the zone lru_lock are two of the hottest locks in the kernel.
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* So add a wild amount of padding here to ensure that they fall into separate
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* cachelines. There are very few zone structures in the machine, so space
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* consumption is not a concern here.
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*/
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#if defined(CONFIG_SMP)
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struct zone_padding {
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char x[0];
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} ____cacheline_internodealigned_in_smp;
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#define ZONE_PADDING(name) struct zone_padding name;
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#else
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#define ZONE_PADDING(name)
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#endif
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#ifdef CONFIG_NUMA
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enum numa_stat_item {
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NUMA_HIT, /* allocated in intended node */
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NUMA_MISS, /* allocated in non intended node */
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NUMA_FOREIGN, /* was intended here, hit elsewhere */
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NUMA_INTERLEAVE_HIT, /* interleaver preferred this zone */
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NUMA_LOCAL, /* allocation from local node */
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NUMA_OTHER, /* allocation from other node */
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NR_VM_NUMA_STAT_ITEMS
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};
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#else
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#define NR_VM_NUMA_STAT_ITEMS 0
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#endif
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enum zone_stat_item {
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/* First 128 byte cacheline (assuming 64 bit words) */
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NR_FREE_PAGES,
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NR_ZONE_LRU_BASE, /* Used only for compaction and reclaim retry */
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NR_ZONE_INACTIVE_ANON = NR_ZONE_LRU_BASE,
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NR_ZONE_ACTIVE_ANON,
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NR_ZONE_INACTIVE_FILE,
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NR_ZONE_ACTIVE_FILE,
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NR_ZONE_UNEVICTABLE,
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NR_ZONE_WRITE_PENDING, /* Count of dirty, writeback and unstable pages */
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NR_MLOCK, /* mlock()ed pages found and moved off LRU */
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NR_PAGETABLE, /* used for pagetables */
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NR_KERNEL_STACK_KB, /* measured in KiB */
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/* Second 128 byte cacheline */
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NR_BOUNCE,
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#if IS_ENABLED(CONFIG_ZSMALLOC)
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NR_ZSPAGES, /* allocated in zsmalloc */
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#endif
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NR_FREE_CMA_PAGES,
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NR_VM_ZONE_STAT_ITEMS };
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enum node_stat_item {
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NR_LRU_BASE,
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NR_INACTIVE_ANON = NR_LRU_BASE, /* must match order of LRU_[IN]ACTIVE */
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NR_ACTIVE_ANON, /* " " " " " */
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NR_INACTIVE_FILE, /* " " " " " */
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NR_ACTIVE_FILE, /* " " " " " */
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NR_UNEVICTABLE, /* " " " " " */
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NR_SLAB_RECLAIMABLE,
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NR_SLAB_UNRECLAIMABLE,
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NR_ISOLATED_ANON, /* Temporary isolated pages from anon lru */
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NR_ISOLATED_FILE, /* Temporary isolated pages from file lru */
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WORKINGSET_NODES,
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WORKINGSET_REFAULT,
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WORKINGSET_ACTIVATE,
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WORKINGSET_RESTORE,
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WORKINGSET_NODERECLAIM,
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NR_ANON_MAPPED, /* Mapped anonymous pages */
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NR_FILE_MAPPED, /* pagecache pages mapped into pagetables.
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only modified from process context */
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NR_FILE_PAGES,
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NR_FILE_DIRTY,
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NR_WRITEBACK,
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NR_WRITEBACK_TEMP, /* Writeback using temporary buffers */
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NR_SHMEM, /* shmem pages (included tmpfs/GEM pages) */
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NR_SHMEM_THPS,
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NR_SHMEM_PMDMAPPED,
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NR_FILE_THPS,
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NR_FILE_PMDMAPPED,
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NR_ANON_THPS,
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NR_UNSTABLE_NFS, /* NFS unstable pages */
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NR_VMSCAN_WRITE,
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NR_VMSCAN_IMMEDIATE, /* Prioritise for reclaim when writeback ends */
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NR_DIRTIED, /* page dirtyings since bootup */
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NR_WRITTEN, /* page writings since bootup */
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NR_KERNEL_MISC_RECLAIMABLE, /* reclaimable non-slab kernel pages */
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NR_VM_NODE_STAT_ITEMS
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};
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/*
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* We do arithmetic on the LRU lists in various places in the code,
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* so it is important to keep the active lists LRU_ACTIVE higher in
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* the array than the corresponding inactive lists, and to keep
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* the *_FILE lists LRU_FILE higher than the corresponding _ANON lists.
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*
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* This has to be kept in sync with the statistics in zone_stat_item
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* above and the descriptions in vmstat_text in mm/vmstat.c
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*/
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#define LRU_BASE 0
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#define LRU_ACTIVE 1
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#define LRU_FILE 2
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enum lru_list {
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LRU_INACTIVE_ANON = LRU_BASE,
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LRU_ACTIVE_ANON = LRU_BASE + LRU_ACTIVE,
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LRU_INACTIVE_FILE = LRU_BASE + LRU_FILE,
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LRU_ACTIVE_FILE = LRU_BASE + LRU_FILE + LRU_ACTIVE,
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LRU_UNEVICTABLE,
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NR_LRU_LISTS
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};
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#define for_each_lru(lru) for (lru = 0; lru < NR_LRU_LISTS; lru++)
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#define for_each_evictable_lru(lru) for (lru = 0; lru <= LRU_ACTIVE_FILE; lru++)
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static inline bool is_file_lru(enum lru_list lru)
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{
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return (lru == LRU_INACTIVE_FILE || lru == LRU_ACTIVE_FILE);
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}
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static inline bool is_active_lru(enum lru_list lru)
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{
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return (lru == LRU_ACTIVE_ANON || lru == LRU_ACTIVE_FILE);
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}
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struct zone_reclaim_stat {
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/*
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* The pageout code in vmscan.c keeps track of how many of the
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* mem/swap backed and file backed pages are referenced.
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* The higher the rotated/scanned ratio, the more valuable
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* that cache is.
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*
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* The anon LRU stats live in [0], file LRU stats in [1]
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*/
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unsigned long recent_rotated[2];
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unsigned long recent_scanned[2];
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};
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enum lruvec_flags {
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LRUVEC_CONGESTED, /* lruvec has many dirty pages
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* backed by a congested BDI
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*/
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};
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struct lruvec {
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struct list_head lists[NR_LRU_LISTS];
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struct zone_reclaim_stat reclaim_stat;
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/* Evictions & activations on the inactive file list */
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atomic_long_t inactive_age;
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/* Refaults at the time of last reclaim cycle */
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unsigned long refaults;
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/* Various lruvec state flags (enum lruvec_flags) */
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unsigned long flags;
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#ifdef CONFIG_MEMCG
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struct pglist_data *pgdat;
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#endif
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};
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/* Isolate unmapped pages */
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#define ISOLATE_UNMAPPED ((__force isolate_mode_t)0x2)
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/* Isolate for asynchronous migration */
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#define ISOLATE_ASYNC_MIGRATE ((__force isolate_mode_t)0x4)
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/* Isolate unevictable pages */
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#define ISOLATE_UNEVICTABLE ((__force isolate_mode_t)0x8)
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/* LRU Isolation modes. */
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typedef unsigned __bitwise isolate_mode_t;
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enum zone_watermarks {
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WMARK_MIN,
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WMARK_LOW,
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WMARK_HIGH,
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NR_WMARK
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};
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#define min_wmark_pages(z) (z->_watermark[WMARK_MIN] + z->watermark_boost)
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#define low_wmark_pages(z) (z->_watermark[WMARK_LOW] + z->watermark_boost)
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#define high_wmark_pages(z) (z->_watermark[WMARK_HIGH] + z->watermark_boost)
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#define wmark_pages(z, i) (z->_watermark[i] + z->watermark_boost)
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struct per_cpu_pages {
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int count; /* number of pages in the list */
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int high; /* high watermark, emptying needed */
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int batch; /* chunk size for buddy add/remove */
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/* Lists of pages, one per migrate type stored on the pcp-lists */
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struct list_head lists[MIGRATE_PCPTYPES];
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};
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struct per_cpu_pageset {
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struct per_cpu_pages pcp;
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#ifdef CONFIG_NUMA
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s8 expire;
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u16 vm_numa_stat_diff[NR_VM_NUMA_STAT_ITEMS];
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#endif
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#ifdef CONFIG_SMP
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s8 stat_threshold;
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s8 vm_stat_diff[NR_VM_ZONE_STAT_ITEMS];
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#endif
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};
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struct per_cpu_nodestat {
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s8 stat_threshold;
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s8 vm_node_stat_diff[NR_VM_NODE_STAT_ITEMS];
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};
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#endif /* !__GENERATING_BOUNDS.H */
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enum zone_type {
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/*
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* ZONE_DMA and ZONE_DMA32 are used when there are peripherals not able
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* to DMA to all of the addressable memory (ZONE_NORMAL).
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* On architectures where this area covers the whole 32 bit address
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* space ZONE_DMA32 is used. ZONE_DMA is left for the ones with smaller
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* DMA addressing constraints. This distinction is important as a 32bit
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* DMA mask is assumed when ZONE_DMA32 is defined. Some 64-bit
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* platforms may need both zones as they support peripherals with
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* different DMA addressing limitations.
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*
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* Some examples:
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*
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* - i386 and x86_64 have a fixed 16M ZONE_DMA and ZONE_DMA32 for the
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* rest of the lower 4G.
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*
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* - arm only uses ZONE_DMA, the size, up to 4G, may vary depending on
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* the specific device.
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*
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* - arm64 has a fixed 1G ZONE_DMA and ZONE_DMA32 for the rest of the
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* lower 4G.
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*
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* - powerpc only uses ZONE_DMA, the size, up to 2G, may vary
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* depending on the specific device.
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*
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* - s390 uses ZONE_DMA fixed to the lower 2G.
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*
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* - ia64 and riscv only use ZONE_DMA32.
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*
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* - parisc uses neither.
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*/
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#ifdef CONFIG_ZONE_DMA
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ZONE_DMA,
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#endif
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#ifdef CONFIG_ZONE_DMA32
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ZONE_DMA32,
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#endif
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/*
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* Normal addressable memory is in ZONE_NORMAL. DMA operations can be
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* performed on pages in ZONE_NORMAL if the DMA devices support
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* transfers to all addressable memory.
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*/
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ZONE_NORMAL,
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#ifdef CONFIG_HIGHMEM
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/*
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* A memory area that is only addressable by the kernel through
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* mapping portions into its own address space. This is for example
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* used by i386 to allow the kernel to address the memory beyond
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* 900MB. The kernel will set up special mappings (page
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* table entries on i386) for each page that the kernel needs to
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* access.
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*/
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ZONE_HIGHMEM,
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#endif
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ZONE_MOVABLE,
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#ifdef CONFIG_ZONE_DEVICE
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ZONE_DEVICE,
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#endif
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__MAX_NR_ZONES
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};
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#ifndef __GENERATING_BOUNDS_H
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struct zone {
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/* Read-mostly fields */
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/* zone watermarks, access with *_wmark_pages(zone) macros */
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unsigned long _watermark[NR_WMARK];
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unsigned long watermark_boost;
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unsigned long nr_reserved_highatomic;
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/*
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* We don't know if the memory that we're going to allocate will be
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* freeable or/and it will be released eventually, so to avoid totally
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* wasting several GB of ram we must reserve some of the lower zone
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* memory (otherwise we risk to run OOM on the lower zones despite
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* there being tons of freeable ram on the higher zones). This array is
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* recalculated at runtime if the sysctl_lowmem_reserve_ratio sysctl
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* changes.
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*/
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long lowmem_reserve[MAX_NR_ZONES];
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#ifdef CONFIG_NUMA
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int node;
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#endif
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struct pglist_data *zone_pgdat;
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struct per_cpu_pageset __percpu *pageset;
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#ifndef CONFIG_SPARSEMEM
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/*
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* Flags for a pageblock_nr_pages block. See pageblock-flags.h.
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* In SPARSEMEM, this map is stored in struct mem_section
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*/
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unsigned long *pageblock_flags;
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#endif /* CONFIG_SPARSEMEM */
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/* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */
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unsigned long zone_start_pfn;
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/*
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* spanned_pages is the total pages spanned by the zone, including
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* holes, which is calculated as:
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* spanned_pages = zone_end_pfn - zone_start_pfn;
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*
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* present_pages is physical pages existing within the zone, which
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* is calculated as:
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* present_pages = spanned_pages - absent_pages(pages in holes);
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*
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* managed_pages is present pages managed by the buddy system, which
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* is calculated as (reserved_pages includes pages allocated by the
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* bootmem allocator):
|
|
* managed_pages = present_pages - reserved_pages;
|
|
*
|
|
* So present_pages may be used by memory hotplug or memory power
|
|
* management logic to figure out unmanaged pages by checking
|
|
* (present_pages - managed_pages). And managed_pages should be used
|
|
* by page allocator and vm scanner to calculate all kinds of watermarks
|
|
* and thresholds.
|
|
*
|
|
* Locking rules:
|
|
*
|
|
* zone_start_pfn and spanned_pages are 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 span_seq 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.
|
|
*
|
|
* Write access to present_pages at runtime should be protected by
|
|
* mem_hotplug_begin/end(). Any reader who can't tolerant drift of
|
|
* present_pages should get_online_mems() to get a stable value.
|
|
*/
|
|
atomic_long_t managed_pages;
|
|
unsigned long spanned_pages;
|
|
unsigned long present_pages;
|
|
|
|
const char *name;
|
|
|
|
#ifdef CONFIG_MEMORY_ISOLATION
|
|
/*
|
|
* Number of isolated pageblock. It is used to solve incorrect
|
|
* freepage counting problem due to racy retrieving migratetype
|
|
* of pageblock. Protected by zone->lock.
|
|
*/
|
|
unsigned long nr_isolate_pageblock;
|
|
#endif
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
/* see spanned/present_pages for more description */
|
|
seqlock_t span_seqlock;
|
|
#endif
|
|
|
|
int initialized;
|
|
|
|
/* Write-intensive fields used from the page allocator */
|
|
ZONE_PADDING(_pad1_)
|
|
|
|
/* free areas of different sizes */
|
|
struct free_area free_area[MAX_ORDER];
|
|
|
|
/* zone flags, see below */
|
|
unsigned long flags;
|
|
|
|
/* Primarily protects free_area */
|
|
spinlock_t lock;
|
|
|
|
/* Write-intensive fields used by compaction and vmstats. */
|
|
ZONE_PADDING(_pad2_)
|
|
|
|
/*
|
|
* When free pages are below this point, additional steps are taken
|
|
* when reading the number of free pages to avoid per-cpu counter
|
|
* drift allowing watermarks to be breached
|
|
*/
|
|
unsigned long percpu_drift_mark;
|
|
|
|
#if defined CONFIG_COMPACTION || defined CONFIG_CMA
|
|
/* pfn where compaction free scanner should start */
|
|
unsigned long compact_cached_free_pfn;
|
|
/* pfn where async and sync compaction migration scanner should start */
|
|
unsigned long compact_cached_migrate_pfn[2];
|
|
unsigned long compact_init_migrate_pfn;
|
|
unsigned long compact_init_free_pfn;
|
|
#endif
|
|
|
|
#ifdef CONFIG_COMPACTION
|
|
/*
|
|
* On compaction failure, 1<<compact_defer_shift compactions
|
|
* are skipped before trying again. The number attempted since
|
|
* last failure is tracked with compact_considered.
|
|
*/
|
|
unsigned int compact_considered;
|
|
unsigned int compact_defer_shift;
|
|
int compact_order_failed;
|
|
#endif
|
|
|
|
#if defined CONFIG_COMPACTION || defined CONFIG_CMA
|
|
/* Set to true when the PG_migrate_skip bits should be cleared */
|
|
bool compact_blockskip_flush;
|
|
#endif
|
|
|
|
bool contiguous;
|
|
|
|
ZONE_PADDING(_pad3_)
|
|
/* Zone statistics */
|
|
atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS];
|
|
atomic_long_t vm_numa_stat[NR_VM_NUMA_STAT_ITEMS];
|
|
} ____cacheline_internodealigned_in_smp;
|
|
|
|
enum pgdat_flags {
|
|
PGDAT_DIRTY, /* reclaim scanning has recently found
|
|
* many dirty file pages at the tail
|
|
* of the LRU.
|
|
*/
|
|
PGDAT_WRITEBACK, /* reclaim scanning has recently found
|
|
* many pages under writeback
|
|
*/
|
|
PGDAT_RECLAIM_LOCKED, /* prevents concurrent reclaim */
|
|
};
|
|
|
|
enum zone_flags {
|
|
ZONE_BOOSTED_WATERMARK, /* zone recently boosted watermarks.
|
|
* Cleared when kswapd is woken.
|
|
*/
|
|
};
|
|
|
|
static inline unsigned long zone_managed_pages(struct zone *zone)
|
|
{
|
|
return (unsigned long)atomic_long_read(&zone->managed_pages);
|
|
}
|
|
|
|
static inline unsigned long zone_end_pfn(const struct zone *zone)
|
|
{
|
|
return zone->zone_start_pfn + zone->spanned_pages;
|
|
}
|
|
|
|
static inline bool zone_spans_pfn(const struct zone *zone, unsigned long pfn)
|
|
{
|
|
return zone->zone_start_pfn <= pfn && pfn < zone_end_pfn(zone);
|
|
}
|
|
|
|
static inline bool zone_is_initialized(struct zone *zone)
|
|
{
|
|
return zone->initialized;
|
|
}
|
|
|
|
static inline bool zone_is_empty(struct zone *zone)
|
|
{
|
|
return zone->spanned_pages == 0;
|
|
}
|
|
|
|
/*
|
|
* Return true if [start_pfn, start_pfn + nr_pages) range has a non-empty
|
|
* intersection with the given zone
|
|
*/
|
|
static inline bool zone_intersects(struct zone *zone,
|
|
unsigned long start_pfn, unsigned long nr_pages)
|
|
{
|
|
if (zone_is_empty(zone))
|
|
return false;
|
|
if (start_pfn >= zone_end_pfn(zone) ||
|
|
start_pfn + nr_pages <= zone->zone_start_pfn)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
|
|
/* Maximum number of zones on a zonelist */
|
|
#define MAX_ZONES_PER_ZONELIST (MAX_NUMNODES * MAX_NR_ZONES)
|
|
|
|
enum {
|
|
ZONELIST_FALLBACK, /* zonelist with fallback */
|
|
#ifdef CONFIG_NUMA
|
|
/*
|
|
* The NUMA zonelists are doubled because we need zonelists that
|
|
* restrict the allocations to a single node for __GFP_THISNODE.
|
|
*/
|
|
ZONELIST_NOFALLBACK, /* zonelist without fallback (__GFP_THISNODE) */
|
|
#endif
|
|
MAX_ZONELISTS
|
|
};
|
|
|
|
/*
|
|
* This struct contains information about a zone in a zonelist. It is stored
|
|
* here to avoid dereferences into large structures and lookups of tables
|
|
*/
|
|
struct zoneref {
|
|
struct zone *zone; /* Pointer to actual zone */
|
|
int zone_idx; /* zone_idx(zoneref->zone) */
|
|
};
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* To speed the reading of the zonelist, the zonerefs contain the zone index
|
|
* of the entry being read. Helper functions to access information given
|
|
* a struct zoneref are
|
|
*
|
|
* zonelist_zone() - Return the struct zone * for an entry in _zonerefs
|
|
* zonelist_zone_idx() - Return the index of the zone for an entry
|
|
* zonelist_node_idx() - Return the index of the node for an entry
|
|
*/
|
|
struct zonelist {
|
|
struct zoneref _zonerefs[MAX_ZONES_PER_ZONELIST + 1];
|
|
};
|
|
|
|
#ifndef CONFIG_DISCONTIGMEM
|
|
/* The array of struct pages - for discontigmem use pgdat->lmem_map */
|
|
extern struct page *mem_map;
|
|
#endif
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
struct deferred_split {
|
|
spinlock_t split_queue_lock;
|
|
struct list_head split_queue;
|
|
unsigned long split_queue_len;
|
|
};
|
|
#endif
|
|
|
|
/*
|
|
* On NUMA machines, each NUMA node would have a pg_data_t to describe
|
|
* it's memory layout. On UMA machines there is a single pglist_data which
|
|
* describes the whole memory.
|
|
*
|
|
* 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[MAX_ZONELISTS];
|
|
int nr_zones;
|
|
#ifdef CONFIG_FLAT_NODE_MEM_MAP /* means !SPARSEMEM */
|
|
struct page *node_mem_map;
|
|
#ifdef CONFIG_PAGE_EXTENSION
|
|
struct page_ext *node_page_ext;
|
|
#endif
|
|
#endif
|
|
#if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
|
|
/*
|
|
* Must be held any time you expect node_start_pfn,
|
|
* node_present_pages, node_spanned_pages or nr_zones to stay constant.
|
|
*
|
|
* pgdat_resize_lock() and pgdat_resize_unlock() are provided to
|
|
* manipulate node_size_lock without checking for CONFIG_MEMORY_HOTPLUG
|
|
* or CONFIG_DEFERRED_STRUCT_PAGE_INIT.
|
|
*
|
|
* Nests above zone->lock and zone->span_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;
|
|
wait_queue_head_t kswapd_wait;
|
|
wait_queue_head_t pfmemalloc_wait;
|
|
struct task_struct *kswapd; /* Protected by
|
|
mem_hotplug_begin/end() */
|
|
int kswapd_order;
|
|
enum zone_type kswapd_classzone_idx;
|
|
|
|
int kswapd_failures; /* Number of 'reclaimed == 0' runs */
|
|
|
|
#ifdef CONFIG_COMPACTION
|
|
int kcompactd_max_order;
|
|
enum zone_type kcompactd_classzone_idx;
|
|
wait_queue_head_t kcompactd_wait;
|
|
struct task_struct *kcompactd;
|
|
#endif
|
|
/*
|
|
* This is a per-node reserve of pages that are not available
|
|
* to userspace allocations.
|
|
*/
|
|
unsigned long totalreserve_pages;
|
|
|
|
#ifdef CONFIG_NUMA
|
|
/*
|
|
* node reclaim becomes active if more unmapped pages exist.
|
|
*/
|
|
unsigned long min_unmapped_pages;
|
|
unsigned long min_slab_pages;
|
|
#endif /* CONFIG_NUMA */
|
|
|
|
/* Write-intensive fields used by page reclaim */
|
|
ZONE_PADDING(_pad1_)
|
|
spinlock_t lru_lock;
|
|
|
|
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
|
|
/*
|
|
* If memory initialisation on large machines is deferred then this
|
|
* is the first PFN that needs to be initialised.
|
|
*/
|
|
unsigned long first_deferred_pfn;
|
|
#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
struct deferred_split deferred_split_queue;
|
|
#endif
|
|
|
|
/* Fields commonly accessed by the page reclaim scanner */
|
|
|
|
/*
|
|
* NOTE: THIS IS UNUSED IF MEMCG IS ENABLED.
|
|
*
|
|
* Use mem_cgroup_lruvec() to look up lruvecs.
|
|
*/
|
|
struct lruvec __lruvec;
|
|
|
|
unsigned long flags;
|
|
|
|
ZONE_PADDING(_pad2_)
|
|
|
|
/* Per-node vmstats */
|
|
struct per_cpu_nodestat __percpu *per_cpu_nodestats;
|
|
atomic_long_t vm_stat[NR_VM_NODE_STAT_ITEMS];
|
|
} 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))
|
|
|
|
#define node_start_pfn(nid) (NODE_DATA(nid)->node_start_pfn)
|
|
#define node_end_pfn(nid) pgdat_end_pfn(NODE_DATA(nid))
|
|
|
|
static inline unsigned long pgdat_end_pfn(pg_data_t *pgdat)
|
|
{
|
|
return pgdat->node_start_pfn + pgdat->node_spanned_pages;
|
|
}
|
|
|
|
static inline bool pgdat_is_empty(pg_data_t *pgdat)
|
|
{
|
|
return !pgdat->node_start_pfn && !pgdat->node_spanned_pages;
|
|
}
|
|
|
|
#include <linux/memory_hotplug.h>
|
|
|
|
void build_all_zonelists(pg_data_t *pgdat);
|
|
void wakeup_kswapd(struct zone *zone, gfp_t gfp_mask, int order,
|
|
enum zone_type classzone_idx);
|
|
bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark,
|
|
int classzone_idx, unsigned int alloc_flags,
|
|
long free_pages);
|
|
bool zone_watermark_ok(struct zone *z, unsigned int order,
|
|
unsigned long mark, int classzone_idx,
|
|
unsigned int alloc_flags);
|
|
bool zone_watermark_ok_safe(struct zone *z, unsigned int order,
|
|
unsigned long mark, int classzone_idx);
|
|
enum memmap_context {
|
|
MEMMAP_EARLY,
|
|
MEMMAP_HOTPLUG,
|
|
};
|
|
extern void init_currently_empty_zone(struct zone *zone, unsigned long start_pfn,
|
|
unsigned long size);
|
|
|
|
extern void lruvec_init(struct lruvec *lruvec);
|
|
|
|
static inline struct pglist_data *lruvec_pgdat(struct lruvec *lruvec)
|
|
{
|
|
#ifdef CONFIG_MEMCG
|
|
return lruvec->pgdat;
|
|
#else
|
|
return container_of(lruvec, struct pglist_data, __lruvec);
|
|
#endif
|
|
}
|
|
|
|
extern unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone_idx);
|
|
|
|
#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
|
|
|
|
#if defined(CONFIG_SPARSEMEM)
|
|
void memblocks_present(void);
|
|
#else
|
|
static inline void memblocks_present(void) {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HAVE_MEMORYLESS_NODES
|
|
int local_memory_node(int node_id);
|
|
#else
|
|
static inline int local_memory_node(int node_id) { return node_id; };
|
|
#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)
|
|
|
|
/*
|
|
* Returns true if a zone has pages managed by the buddy allocator.
|
|
* All the reclaim decisions have to use this function rather than
|
|
* populated_zone(). If the whole zone is reserved then we can easily
|
|
* end up with populated_zone() && !managed_zone().
|
|
*/
|
|
static inline bool managed_zone(struct zone *zone)
|
|
{
|
|
return zone_managed_pages(zone);
|
|
}
|
|
|
|
/* Returns true if a zone has memory */
|
|
static inline bool populated_zone(struct zone *zone)
|
|
{
|
|
return zone->present_pages;
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
static inline int zone_to_nid(struct zone *zone)
|
|
{
|
|
return zone->node;
|
|
}
|
|
|
|
static inline void zone_set_nid(struct zone *zone, int nid)
|
|
{
|
|
zone->node = nid;
|
|
}
|
|
#else
|
|
static inline int zone_to_nid(struct zone *zone)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void zone_set_nid(struct zone *zone, int nid) {}
|
|
#endif
|
|
|
|
extern int movable_zone;
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
static inline int zone_movable_is_highmem(void)
|
|
{
|
|
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
|
|
return movable_zone == ZONE_HIGHMEM;
|
|
#else
|
|
return (ZONE_MOVABLE - 1) == ZONE_HIGHMEM;
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
static inline int is_highmem_idx(enum zone_type idx)
|
|
{
|
|
#ifdef CONFIG_HIGHMEM
|
|
return (idx == ZONE_HIGHMEM ||
|
|
(idx == ZONE_MOVABLE && zone_movable_is_highmem()));
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
#ifdef CONFIG_HIGHMEM
|
|
return is_highmem_idx(zone_idx(zone));
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/* These two functions are used to setup the per zone pages min values */
|
|
struct ctl_table;
|
|
int min_free_kbytes_sysctl_handler(struct ctl_table *, int,
|
|
void __user *, size_t *, loff_t *);
|
|
int watermark_boost_factor_sysctl_handler(struct ctl_table *, int,
|
|
void __user *, size_t *, loff_t *);
|
|
int watermark_scale_factor_sysctl_handler(struct ctl_table *, int,
|
|
void __user *, size_t *, loff_t *);
|
|
extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES];
|
|
int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *, int,
|
|
void __user *, size_t *, loff_t *);
|
|
int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *, int,
|
|
void __user *, size_t *, loff_t *);
|
|
int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *, int,
|
|
void __user *, size_t *, loff_t *);
|
|
int sysctl_min_slab_ratio_sysctl_handler(struct ctl_table *, int,
|
|
void __user *, size_t *, loff_t *);
|
|
|
|
extern int numa_zonelist_order_handler(struct ctl_table *, int,
|
|
void __user *, size_t *, loff_t *);
|
|
extern char numa_zonelist_order[];
|
|
#define NUMA_ZONELIST_ORDER_LEN 16
|
|
|
|
#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
|
|
|
|
#else /* CONFIG_NEED_MULTIPLE_NODES */
|
|
|
|
#include <asm/mmzone.h>
|
|
|
|
#endif /* !CONFIG_NEED_MULTIPLE_NODES */
|
|
|
|
extern struct pglist_data *first_online_pgdat(void);
|
|
extern struct pglist_data *next_online_pgdat(struct pglist_data *pgdat);
|
|
extern struct zone *next_zone(struct zone *zone);
|
|
|
|
/**
|
|
* for_each_online_pgdat - helper macro to iterate over all online nodes
|
|
* @pgdat - pointer to a pg_data_t variable
|
|
*/
|
|
#define for_each_online_pgdat(pgdat) \
|
|
for (pgdat = first_online_pgdat(); \
|
|
pgdat; \
|
|
pgdat = next_online_pgdat(pgdat))
|
|
/**
|
|
* 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.
|
|
*/
|
|
#define for_each_zone(zone) \
|
|
for (zone = (first_online_pgdat())->node_zones; \
|
|
zone; \
|
|
zone = next_zone(zone))
|
|
|
|
#define for_each_populated_zone(zone) \
|
|
for (zone = (first_online_pgdat())->node_zones; \
|
|
zone; \
|
|
zone = next_zone(zone)) \
|
|
if (!populated_zone(zone)) \
|
|
; /* do nothing */ \
|
|
else
|
|
|
|
static inline struct zone *zonelist_zone(struct zoneref *zoneref)
|
|
{
|
|
return zoneref->zone;
|
|
}
|
|
|
|
static inline int zonelist_zone_idx(struct zoneref *zoneref)
|
|
{
|
|
return zoneref->zone_idx;
|
|
}
|
|
|
|
static inline int zonelist_node_idx(struct zoneref *zoneref)
|
|
{
|
|
return zone_to_nid(zoneref->zone);
|
|
}
|
|
|
|
struct zoneref *__next_zones_zonelist(struct zoneref *z,
|
|
enum zone_type highest_zoneidx,
|
|
nodemask_t *nodes);
|
|
|
|
/**
|
|
* next_zones_zonelist - Returns the next zone at or below highest_zoneidx within the allowed nodemask using a cursor within a zonelist as a starting point
|
|
* @z - The cursor used as a starting point for the search
|
|
* @highest_zoneidx - The zone index of the highest zone to return
|
|
* @nodes - An optional nodemask to filter the zonelist with
|
|
*
|
|
* This function returns the next zone at or below a given zone index that is
|
|
* within the allowed nodemask using a cursor as the starting point for the
|
|
* search. The zoneref returned is a cursor that represents the current zone
|
|
* being examined. It should be advanced by one before calling
|
|
* next_zones_zonelist again.
|
|
*/
|
|
static __always_inline struct zoneref *next_zones_zonelist(struct zoneref *z,
|
|
enum zone_type highest_zoneidx,
|
|
nodemask_t *nodes)
|
|
{
|
|
if (likely(!nodes && zonelist_zone_idx(z) <= highest_zoneidx))
|
|
return z;
|
|
return __next_zones_zonelist(z, highest_zoneidx, nodes);
|
|
}
|
|
|
|
/**
|
|
* first_zones_zonelist - Returns the first zone at or below highest_zoneidx within the allowed nodemask in a zonelist
|
|
* @zonelist - The zonelist to search for a suitable zone
|
|
* @highest_zoneidx - The zone index of the highest zone to return
|
|
* @nodes - An optional nodemask to filter the zonelist with
|
|
* @return - Zoneref pointer for the first suitable zone found (see below)
|
|
*
|
|
* This function returns the first zone at or below a given zone index that is
|
|
* within the allowed nodemask. The zoneref returned is a cursor that can be
|
|
* used to iterate the zonelist with next_zones_zonelist by advancing it by
|
|
* one before calling.
|
|
*
|
|
* When no eligible zone is found, zoneref->zone is NULL (zoneref itself is
|
|
* never NULL). This may happen either genuinely, or due to concurrent nodemask
|
|
* update due to cpuset modification.
|
|
*/
|
|
static inline struct zoneref *first_zones_zonelist(struct zonelist *zonelist,
|
|
enum zone_type highest_zoneidx,
|
|
nodemask_t *nodes)
|
|
{
|
|
return next_zones_zonelist(zonelist->_zonerefs,
|
|
highest_zoneidx, nodes);
|
|
}
|
|
|
|
/**
|
|
* for_each_zone_zonelist_nodemask - helper macro to iterate over valid zones in a zonelist at or below a given zone index and within a nodemask
|
|
* @zone - The current zone in the iterator
|
|
* @z - The current pointer within zonelist->_zonerefs being iterated
|
|
* @zlist - The zonelist being iterated
|
|
* @highidx - The zone index of the highest zone to return
|
|
* @nodemask - Nodemask allowed by the allocator
|
|
*
|
|
* This iterator iterates though all zones at or below a given zone index and
|
|
* within a given nodemask
|
|
*/
|
|
#define for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, nodemask) \
|
|
for (z = first_zones_zonelist(zlist, highidx, nodemask), zone = zonelist_zone(z); \
|
|
zone; \
|
|
z = next_zones_zonelist(++z, highidx, nodemask), \
|
|
zone = zonelist_zone(z))
|
|
|
|
#define for_next_zone_zonelist_nodemask(zone, z, zlist, highidx, nodemask) \
|
|
for (zone = z->zone; \
|
|
zone; \
|
|
z = next_zones_zonelist(++z, highidx, nodemask), \
|
|
zone = zonelist_zone(z))
|
|
|
|
|
|
/**
|
|
* for_each_zone_zonelist - helper macro to iterate over valid zones in a zonelist at or below a given zone index
|
|
* @zone - The current zone in the iterator
|
|
* @z - The current pointer within zonelist->zones being iterated
|
|
* @zlist - The zonelist being iterated
|
|
* @highidx - The zone index of the highest zone to return
|
|
*
|
|
* This iterator iterates though all zones at or below a given zone index.
|
|
*/
|
|
#define for_each_zone_zonelist(zone, z, zlist, highidx) \
|
|
for_each_zone_zonelist_nodemask(zone, z, zlist, highidx, NULL)
|
|
|
|
#ifdef CONFIG_SPARSEMEM
|
|
#include <asm/sparsemem.h>
|
|
#endif
|
|
|
|
#if !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) && \
|
|
!defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP)
|
|
static inline unsigned long early_pfn_to_nid(unsigned long pfn)
|
|
{
|
|
BUILD_BUG_ON(IS_ENABLED(CONFIG_NUMA));
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_FLATMEM
|
|
#define pfn_to_nid(pfn) (0)
|
|
#endif
|
|
|
|
#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 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))
|
|
|
|
#define SECTION_BLOCKFLAGS_BITS \
|
|
((1UL << (PFN_SECTION_SHIFT - pageblock_order)) * NR_PAGEBLOCK_BITS)
|
|
|
|
#if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS
|
|
#error Allocator MAX_ORDER exceeds SECTION_SIZE
|
|
#endif
|
|
|
|
static inline unsigned long pfn_to_section_nr(unsigned long pfn)
|
|
{
|
|
return pfn >> PFN_SECTION_SHIFT;
|
|
}
|
|
static inline unsigned long section_nr_to_pfn(unsigned long sec)
|
|
{
|
|
return sec << PFN_SECTION_SHIFT;
|
|
}
|
|
|
|
#define SECTION_ALIGN_UP(pfn) (((pfn) + PAGES_PER_SECTION - 1) & PAGE_SECTION_MASK)
|
|
#define SECTION_ALIGN_DOWN(pfn) ((pfn) & PAGE_SECTION_MASK)
|
|
|
|
#define SUBSECTION_SHIFT 21
|
|
|
|
#define PFN_SUBSECTION_SHIFT (SUBSECTION_SHIFT - PAGE_SHIFT)
|
|
#define PAGES_PER_SUBSECTION (1UL << PFN_SUBSECTION_SHIFT)
|
|
#define PAGE_SUBSECTION_MASK (~(PAGES_PER_SUBSECTION-1))
|
|
|
|
#if SUBSECTION_SHIFT > SECTION_SIZE_BITS
|
|
#error Subsection size exceeds section size
|
|
#else
|
|
#define SUBSECTIONS_PER_SECTION (1UL << (SECTION_SIZE_BITS - SUBSECTION_SHIFT))
|
|
#endif
|
|
|
|
#define SUBSECTION_ALIGN_UP(pfn) ALIGN((pfn), PAGES_PER_SUBSECTION)
|
|
#define SUBSECTION_ALIGN_DOWN(pfn) ((pfn) & PAGE_SUBSECTION_MASK)
|
|
|
|
struct mem_section_usage {
|
|
DECLARE_BITMAP(subsection_map, SUBSECTIONS_PER_SECTION);
|
|
/* See declaration of similar field in struct zone */
|
|
unsigned long pageblock_flags[0];
|
|
};
|
|
|
|
void subsection_map_init(unsigned long pfn, unsigned long nr_pages);
|
|
|
|
struct page;
|
|
struct page_ext;
|
|
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())
|
|
*
|
|
* Additionally during early boot we encode node id of
|
|
* the location of the section here to guide allocation.
|
|
* (see sparse.c::memory_present())
|
|
*
|
|
* Making it a UL at least makes someone do a cast
|
|
* before using it wrong.
|
|
*/
|
|
unsigned long section_mem_map;
|
|
|
|
struct mem_section_usage *usage;
|
|
#ifdef CONFIG_PAGE_EXTENSION
|
|
/*
|
|
* If SPARSEMEM, pgdat doesn't have page_ext pointer. We use
|
|
* section. (see page_ext.h about this.)
|
|
*/
|
|
struct page_ext *page_ext;
|
|
unsigned long pad;
|
|
#endif
|
|
/*
|
|
* WARNING: mem_section must be a power-of-2 in size for the
|
|
* calculation and use of SECTION_ROOT_MASK to make sense.
|
|
*/
|
|
};
|
|
|
|
#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 DIV_ROUND_UP(NR_MEM_SECTIONS, SECTIONS_PER_ROOT)
|
|
#define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1)
|
|
|
|
#ifdef CONFIG_SPARSEMEM_EXTREME
|
|
extern struct mem_section **mem_section;
|
|
#else
|
|
extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
|
|
#endif
|
|
|
|
static inline unsigned long *section_to_usemap(struct mem_section *ms)
|
|
{
|
|
return ms->usage->pageblock_flags;
|
|
}
|
|
|
|
static inline struct mem_section *__nr_to_section(unsigned long nr)
|
|
{
|
|
#ifdef CONFIG_SPARSEMEM_EXTREME
|
|
if (!mem_section)
|
|
return NULL;
|
|
#endif
|
|
if (!mem_section[SECTION_NR_TO_ROOT(nr)])
|
|
return NULL;
|
|
return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK];
|
|
}
|
|
extern unsigned long __section_nr(struct mem_section *ms);
|
|
extern size_t mem_section_usage_size(void);
|
|
|
|
/*
|
|
* We use the lower bits of the mem_map pointer to store
|
|
* a little bit of information. The pointer is calculated
|
|
* as mem_map - section_nr_to_pfn(pnum). The result is
|
|
* aligned to the minimum alignment of the two values:
|
|
* 1. All mem_map arrays are page-aligned.
|
|
* 2. section_nr_to_pfn() always clears PFN_SECTION_SHIFT
|
|
* lowest bits. PFN_SECTION_SHIFT is arch-specific
|
|
* (equal SECTION_SIZE_BITS - PAGE_SHIFT), and the
|
|
* worst combination is powerpc with 256k pages,
|
|
* which results in PFN_SECTION_SHIFT equal 6.
|
|
* To sum it up, at least 6 bits are available.
|
|
*/
|
|
#define SECTION_MARKED_PRESENT (1UL<<0)
|
|
#define SECTION_HAS_MEM_MAP (1UL<<1)
|
|
#define SECTION_IS_ONLINE (1UL<<2)
|
|
#define SECTION_IS_EARLY (1UL<<3)
|
|
#define SECTION_MAP_LAST_BIT (1UL<<4)
|
|
#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1))
|
|
#define SECTION_NID_SHIFT 3
|
|
|
|
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 present_section(struct mem_section *section)
|
|
{
|
|
return (section && (section->section_mem_map & SECTION_MARKED_PRESENT));
|
|
}
|
|
|
|
static inline int present_section_nr(unsigned long nr)
|
|
{
|
|
return present_section(__nr_to_section(nr));
|
|
}
|
|
|
|
static inline int valid_section(struct mem_section *section)
|
|
{
|
|
return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP));
|
|
}
|
|
|
|
static inline int early_section(struct mem_section *section)
|
|
{
|
|
return (section && (section->section_mem_map & SECTION_IS_EARLY));
|
|
}
|
|
|
|
static inline int valid_section_nr(unsigned long nr)
|
|
{
|
|
return valid_section(__nr_to_section(nr));
|
|
}
|
|
|
|
static inline int online_section(struct mem_section *section)
|
|
{
|
|
return (section && (section->section_mem_map & SECTION_IS_ONLINE));
|
|
}
|
|
|
|
static inline int online_section_nr(unsigned long nr)
|
|
{
|
|
return online_section(__nr_to_section(nr));
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
void online_mem_sections(unsigned long start_pfn, unsigned long end_pfn);
|
|
#ifdef CONFIG_MEMORY_HOTREMOVE
|
|
void offline_mem_sections(unsigned long start_pfn, unsigned long end_pfn);
|
|
#endif
|
|
#endif
|
|
|
|
static inline struct mem_section *__pfn_to_section(unsigned long pfn)
|
|
{
|
|
return __nr_to_section(pfn_to_section_nr(pfn));
|
|
}
|
|
|
|
extern unsigned long __highest_present_section_nr;
|
|
|
|
static inline int subsection_map_index(unsigned long pfn)
|
|
{
|
|
return (pfn & ~(PAGE_SECTION_MASK)) / PAGES_PER_SUBSECTION;
|
|
}
|
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn)
|
|
{
|
|
int idx = subsection_map_index(pfn);
|
|
|
|
return test_bit(idx, ms->usage->subsection_map);
|
|
}
|
|
#else
|
|
static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
#ifndef CONFIG_HAVE_ARCH_PFN_VALID
|
|
static inline int pfn_valid(unsigned long pfn)
|
|
{
|
|
struct mem_section *ms;
|
|
|
|
if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
|
|
return 0;
|
|
ms = __nr_to_section(pfn_to_section_nr(pfn));
|
|
if (!valid_section(ms))
|
|
return 0;
|
|
/*
|
|
* Traditionally early sections always returned pfn_valid() for
|
|
* the entire section-sized span.
|
|
*/
|
|
return early_section(ms) || pfn_section_valid(ms, pfn);
|
|
}
|
|
#endif
|
|
|
|
static inline int pfn_present(unsigned long pfn)
|
|
{
|
|
if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
|
|
return 0;
|
|
return present_section(__nr_to_section(pfn_to_section_nr(pfn)));
|
|
}
|
|
|
|
static inline unsigned long next_present_section_nr(unsigned long section_nr)
|
|
{
|
|
while (++section_nr <= __highest_present_section_nr) {
|
|
if (present_section_nr(section_nr))
|
|
return section_nr;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* 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(pfn) \
|
|
({ \
|
|
unsigned long __pfn_to_nid_pfn = (pfn); \
|
|
page_to_nid(pfn_to_page(__pfn_to_nid_pfn)); \
|
|
})
|
|
#else
|
|
#define pfn_to_nid(pfn) (0)
|
|
#endif
|
|
|
|
#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)
|
|
#define pfn_present pfn_valid
|
|
#define subsection_map_init(_pfn, _nr_pages) do {} while (0)
|
|
#endif /* CONFIG_SPARSEMEM */
|
|
|
|
/*
|
|
* During memory init memblocks map pfns to nids. The search is expensive and
|
|
* this caches recent lookups. The implementation of __early_pfn_to_nid
|
|
* may treat start/end as pfns or sections.
|
|
*/
|
|
struct mminit_pfnnid_cache {
|
|
unsigned long last_start;
|
|
unsigned long last_end;
|
|
int last_nid;
|
|
};
|
|
|
|
#ifndef early_pfn_valid
|
|
#define early_pfn_valid(pfn) (1)
|
|
#endif
|
|
|
|
void memory_present(int nid, unsigned long start, unsigned long end);
|
|
|
|
/*
|
|
* If it is possible to have holes within a MAX_ORDER_NR_PAGES, then we
|
|
* need to check pfn validity within that MAX_ORDER_NR_PAGES block.
|
|
* pfn_valid_within() should be used in this case; we optimise this away
|
|
* when we have no holes within a MAX_ORDER_NR_PAGES block.
|
|
*/
|
|
#ifdef CONFIG_HOLES_IN_ZONE
|
|
#define pfn_valid_within(pfn) pfn_valid(pfn)
|
|
#else
|
|
#define pfn_valid_within(pfn) (1)
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_HAS_HOLES_MEMORYMODEL
|
|
/*
|
|
* pfn_valid() is meant to be able to tell if a given PFN has valid memmap
|
|
* associated with it or not. This means that a struct page exists for this
|
|
* pfn. The caller cannot assume the page is fully initialized in general.
|
|
* Hotplugable pages might not have been onlined yet. pfn_to_online_page()
|
|
* will ensure the struct page is fully online and initialized. Special pages
|
|
* (e.g. ZONE_DEVICE) are never onlined and should be treated accordingly.
|
|
*
|
|
* In FLATMEM, it is expected that holes always have valid memmap as long as
|
|
* there is valid PFNs either side of the hole. In SPARSEMEM, it is assumed
|
|
* that a valid section has a memmap for the entire section.
|
|
*
|
|
* However, an ARM, and maybe other embedded architectures in the future
|
|
* free memmap backing holes to save memory on the assumption the memmap is
|
|
* never used. The page_zone linkages are then broken even though pfn_valid()
|
|
* returns true. A walker of the full memmap must then do this additional
|
|
* check to ensure the memmap they are looking at is sane by making sure
|
|
* the zone and PFN linkages are still valid. This is expensive, but walkers
|
|
* of the full memmap are extremely rare.
|
|
*/
|
|
bool memmap_valid_within(unsigned long pfn,
|
|
struct page *page, struct zone *zone);
|
|
#else
|
|
static inline bool memmap_valid_within(unsigned long pfn,
|
|
struct page *page, struct zone *zone)
|
|
{
|
|
return true;
|
|
}
|
|
#endif /* CONFIG_ARCH_HAS_HOLES_MEMORYMODEL */
|
|
|
|
#endif /* !__GENERATING_BOUNDS.H */
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif /* _LINUX_MMZONE_H */
|