mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
718 lines
22 KiB
718 lines
22 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef _LINUX_SWAP_H |
|
#define _LINUX_SWAP_H |
|
|
|
#include <linux/spinlock.h> |
|
#include <linux/linkage.h> |
|
#include <linux/mmzone.h> |
|
#include <linux/list.h> |
|
#include <linux/memcontrol.h> |
|
#include <linux/sched.h> |
|
#include <linux/node.h> |
|
#include <linux/fs.h> |
|
#include <linux/pagemap.h> |
|
#include <linux/atomic.h> |
|
#include <linux/page-flags.h> |
|
#include <uapi/linux/mempolicy.h> |
|
#include <asm/page.h> |
|
|
|
struct notifier_block; |
|
|
|
struct bio; |
|
|
|
struct pagevec; |
|
|
|
#define SWAP_FLAG_PREFER 0x8000 /* set if swap priority specified */ |
|
#define SWAP_FLAG_PRIO_MASK 0x7fff |
|
#define SWAP_FLAG_PRIO_SHIFT 0 |
|
#define SWAP_FLAG_DISCARD 0x10000 /* enable discard for swap */ |
|
#define SWAP_FLAG_DISCARD_ONCE 0x20000 /* discard swap area at swapon-time */ |
|
#define SWAP_FLAG_DISCARD_PAGES 0x40000 /* discard page-clusters after use */ |
|
|
|
#define SWAP_FLAGS_VALID (SWAP_FLAG_PRIO_MASK | SWAP_FLAG_PREFER | \ |
|
SWAP_FLAG_DISCARD | SWAP_FLAG_DISCARD_ONCE | \ |
|
SWAP_FLAG_DISCARD_PAGES) |
|
#define SWAP_BATCH 64 |
|
|
|
static inline int current_is_kswapd(void) |
|
{ |
|
return current->flags & PF_KSWAPD; |
|
} |
|
|
|
/* |
|
* MAX_SWAPFILES defines the maximum number of swaptypes: things which can |
|
* be swapped to. The swap type and the offset into that swap type are |
|
* encoded into pte's and into pgoff_t's in the swapcache. Using five bits |
|
* for the type means that the maximum number of swapcache pages is 27 bits |
|
* on 32-bit-pgoff_t architectures. And that assumes that the architecture packs |
|
* the type/offset into the pte as 5/27 as well. |
|
*/ |
|
#define MAX_SWAPFILES_SHIFT 5 |
|
|
|
/* |
|
* Use some of the swap files numbers for other purposes. This |
|
* is a convenient way to hook into the VM to trigger special |
|
* actions on faults. |
|
*/ |
|
|
|
#define SWP_SWAPIN_ERROR_NUM 1 |
|
#define SWP_SWAPIN_ERROR (MAX_SWAPFILES + SWP_HWPOISON_NUM + \ |
|
SWP_MIGRATION_NUM + SWP_DEVICE_NUM + \ |
|
SWP_PTE_MARKER_NUM) |
|
/* |
|
* PTE markers are used to persist information onto PTEs that are mapped with |
|
* file-backed memories. As its name "PTE" hints, it should only be applied to |
|
* the leaves of pgtables. |
|
*/ |
|
#ifdef CONFIG_PTE_MARKER |
|
#define SWP_PTE_MARKER_NUM 1 |
|
#define SWP_PTE_MARKER (MAX_SWAPFILES + SWP_HWPOISON_NUM + \ |
|
SWP_MIGRATION_NUM + SWP_DEVICE_NUM) |
|
#else |
|
#define SWP_PTE_MARKER_NUM 0 |
|
#endif |
|
|
|
/* |
|
* Unaddressable device memory support. See include/linux/hmm.h and |
|
* Documentation/mm/hmm.rst. Short description is we need struct pages for |
|
* device memory that is unaddressable (inaccessible) by CPU, so that we can |
|
* migrate part of a process memory to device memory. |
|
* |
|
* When a page is migrated from CPU to device, we set the CPU page table entry |
|
* to a special SWP_DEVICE_{READ|WRITE} entry. |
|
* |
|
* When a page is mapped by the device for exclusive access we set the CPU page |
|
* table entries to special SWP_DEVICE_EXCLUSIVE_* entries. |
|
*/ |
|
#ifdef CONFIG_DEVICE_PRIVATE |
|
#define SWP_DEVICE_NUM 4 |
|
#define SWP_DEVICE_WRITE (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM) |
|
#define SWP_DEVICE_READ (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM+1) |
|
#define SWP_DEVICE_EXCLUSIVE_WRITE (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM+2) |
|
#define SWP_DEVICE_EXCLUSIVE_READ (MAX_SWAPFILES+SWP_HWPOISON_NUM+SWP_MIGRATION_NUM+3) |
|
#else |
|
#define SWP_DEVICE_NUM 0 |
|
#endif |
|
|
|
/* |
|
* Page migration support. |
|
* |
|
* SWP_MIGRATION_READ_EXCLUSIVE is only applicable to anonymous pages and |
|
* indicates that the referenced (part of) an anonymous page is exclusive to |
|
* a single process. For SWP_MIGRATION_WRITE, that information is implicit: |
|
* (part of) an anonymous page that are mapped writable are exclusive to a |
|
* single process. |
|
*/ |
|
#ifdef CONFIG_MIGRATION |
|
#define SWP_MIGRATION_NUM 3 |
|
#define SWP_MIGRATION_READ (MAX_SWAPFILES + SWP_HWPOISON_NUM) |
|
#define SWP_MIGRATION_READ_EXCLUSIVE (MAX_SWAPFILES + SWP_HWPOISON_NUM + 1) |
|
#define SWP_MIGRATION_WRITE (MAX_SWAPFILES + SWP_HWPOISON_NUM + 2) |
|
#else |
|
#define SWP_MIGRATION_NUM 0 |
|
#endif |
|
|
|
/* |
|
* Handling of hardware poisoned pages with memory corruption. |
|
*/ |
|
#ifdef CONFIG_MEMORY_FAILURE |
|
#define SWP_HWPOISON_NUM 1 |
|
#define SWP_HWPOISON MAX_SWAPFILES |
|
#else |
|
#define SWP_HWPOISON_NUM 0 |
|
#endif |
|
|
|
#define MAX_SWAPFILES \ |
|
((1 << MAX_SWAPFILES_SHIFT) - SWP_DEVICE_NUM - \ |
|
SWP_MIGRATION_NUM - SWP_HWPOISON_NUM - \ |
|
SWP_PTE_MARKER_NUM - SWP_SWAPIN_ERROR_NUM) |
|
|
|
/* |
|
* Magic header for a swap area. The first part of the union is |
|
* what the swap magic looks like for the old (limited to 128MB) |
|
* swap area format, the second part of the union adds - in the |
|
* old reserved area - some extra information. Note that the first |
|
* kilobyte is reserved for boot loader or disk label stuff... |
|
* |
|
* Having the magic at the end of the PAGE_SIZE makes detecting swap |
|
* areas somewhat tricky on machines that support multiple page sizes. |
|
* For 2.5 we'll probably want to move the magic to just beyond the |
|
* bootbits... |
|
*/ |
|
union swap_header { |
|
struct { |
|
char reserved[PAGE_SIZE - 10]; |
|
char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */ |
|
} magic; |
|
struct { |
|
char bootbits[1024]; /* Space for disklabel etc. */ |
|
__u32 version; |
|
__u32 last_page; |
|
__u32 nr_badpages; |
|
unsigned char sws_uuid[16]; |
|
unsigned char sws_volume[16]; |
|
__u32 padding[117]; |
|
__u32 badpages[1]; |
|
} info; |
|
}; |
|
|
|
/* |
|
* current->reclaim_state points to one of these when a task is running |
|
* memory reclaim |
|
*/ |
|
struct reclaim_state { |
|
unsigned long reclaimed_slab; |
|
#ifdef CONFIG_LRU_GEN |
|
/* per-thread mm walk data */ |
|
struct lru_gen_mm_walk *mm_walk; |
|
#endif |
|
}; |
|
|
|
#ifdef __KERNEL__ |
|
|
|
struct address_space; |
|
struct sysinfo; |
|
struct writeback_control; |
|
struct zone; |
|
|
|
/* |
|
* A swap extent maps a range of a swapfile's PAGE_SIZE pages onto a range of |
|
* disk blocks. A rbtree of swap extents maps the entire swapfile (Where the |
|
* term `swapfile' refers to either a blockdevice or an IS_REG file). Apart |
|
* from setup, they're handled identically. |
|
* |
|
* We always assume that blocks are of size PAGE_SIZE. |
|
*/ |
|
struct swap_extent { |
|
struct rb_node rb_node; |
|
pgoff_t start_page; |
|
pgoff_t nr_pages; |
|
sector_t start_block; |
|
}; |
|
|
|
/* |
|
* Max bad pages in the new format.. |
|
*/ |
|
#define MAX_SWAP_BADPAGES \ |
|
((offsetof(union swap_header, magic.magic) - \ |
|
offsetof(union swap_header, info.badpages)) / sizeof(int)) |
|
|
|
enum { |
|
SWP_USED = (1 << 0), /* is slot in swap_info[] used? */ |
|
SWP_WRITEOK = (1 << 1), /* ok to write to this swap? */ |
|
SWP_DISCARDABLE = (1 << 2), /* blkdev support discard */ |
|
SWP_DISCARDING = (1 << 3), /* now discarding a free cluster */ |
|
SWP_SOLIDSTATE = (1 << 4), /* blkdev seeks are cheap */ |
|
SWP_CONTINUED = (1 << 5), /* swap_map has count continuation */ |
|
SWP_BLKDEV = (1 << 6), /* its a block device */ |
|
SWP_ACTIVATED = (1 << 7), /* set after swap_activate success */ |
|
SWP_FS_OPS = (1 << 8), /* swapfile operations go through fs */ |
|
SWP_AREA_DISCARD = (1 << 9), /* single-time swap area discards */ |
|
SWP_PAGE_DISCARD = (1 << 10), /* freed swap page-cluster discards */ |
|
SWP_STABLE_WRITES = (1 << 11), /* no overwrite PG_writeback pages */ |
|
SWP_SYNCHRONOUS_IO = (1 << 12), /* synchronous IO is efficient */ |
|
/* add others here before... */ |
|
SWP_SCANNING = (1 << 14), /* refcount in scan_swap_map */ |
|
}; |
|
|
|
#define SWAP_CLUSTER_MAX 32UL |
|
#define COMPACT_CLUSTER_MAX SWAP_CLUSTER_MAX |
|
|
|
/* Bit flag in swap_map */ |
|
#define SWAP_HAS_CACHE 0x40 /* Flag page is cached, in first swap_map */ |
|
#define COUNT_CONTINUED 0x80 /* Flag swap_map continuation for full count */ |
|
|
|
/* Special value in first swap_map */ |
|
#define SWAP_MAP_MAX 0x3e /* Max count */ |
|
#define SWAP_MAP_BAD 0x3f /* Note page is bad */ |
|
#define SWAP_MAP_SHMEM 0xbf /* Owned by shmem/tmpfs */ |
|
|
|
/* Special value in each swap_map continuation */ |
|
#define SWAP_CONT_MAX 0x7f /* Max count */ |
|
|
|
/* |
|
* We use this to track usage of a cluster. A cluster is a block of swap disk |
|
* space with SWAPFILE_CLUSTER pages long and naturally aligns in disk. All |
|
* free clusters are organized into a list. We fetch an entry from the list to |
|
* get a free cluster. |
|
* |
|
* The data field stores next cluster if the cluster is free or cluster usage |
|
* counter otherwise. The flags field determines if a cluster is free. This is |
|
* protected by swap_info_struct.lock. |
|
*/ |
|
struct swap_cluster_info { |
|
spinlock_t lock; /* |
|
* Protect swap_cluster_info fields |
|
* and swap_info_struct->swap_map |
|
* elements correspond to the swap |
|
* cluster |
|
*/ |
|
unsigned int data:24; |
|
unsigned int flags:8; |
|
}; |
|
#define CLUSTER_FLAG_FREE 1 /* This cluster is free */ |
|
#define CLUSTER_FLAG_NEXT_NULL 2 /* This cluster has no next cluster */ |
|
#define CLUSTER_FLAG_HUGE 4 /* This cluster is backing a transparent huge page */ |
|
|
|
/* |
|
* We assign a cluster to each CPU, so each CPU can allocate swap entry from |
|
* its own cluster and swapout sequentially. The purpose is to optimize swapout |
|
* throughput. |
|
*/ |
|
struct percpu_cluster { |
|
struct swap_cluster_info index; /* Current cluster index */ |
|
unsigned int next; /* Likely next allocation offset */ |
|
}; |
|
|
|
struct swap_cluster_list { |
|
struct swap_cluster_info head; |
|
struct swap_cluster_info tail; |
|
}; |
|
|
|
/* |
|
* The in-memory structure used to track swap areas. |
|
*/ |
|
struct swap_info_struct { |
|
struct percpu_ref users; /* indicate and keep swap device valid. */ |
|
unsigned long flags; /* SWP_USED etc: see above */ |
|
signed short prio; /* swap priority of this type */ |
|
struct plist_node list; /* entry in swap_active_head */ |
|
signed char type; /* strange name for an index */ |
|
unsigned int max; /* extent of the swap_map */ |
|
unsigned char *swap_map; /* vmalloc'ed array of usage counts */ |
|
struct swap_cluster_info *cluster_info; /* cluster info. Only for SSD */ |
|
struct swap_cluster_list free_clusters; /* free clusters list */ |
|
unsigned int lowest_bit; /* index of first free in swap_map */ |
|
unsigned int highest_bit; /* index of last free in swap_map */ |
|
unsigned int pages; /* total of usable pages of swap */ |
|
unsigned int inuse_pages; /* number of those currently in use */ |
|
unsigned int cluster_next; /* likely index for next allocation */ |
|
unsigned int cluster_nr; /* countdown to next cluster search */ |
|
unsigned int __percpu *cluster_next_cpu; /*percpu index for next allocation */ |
|
struct percpu_cluster __percpu *percpu_cluster; /* per cpu's swap location */ |
|
struct rb_root swap_extent_root;/* root of the swap extent rbtree */ |
|
struct block_device *bdev; /* swap device or bdev of swap file */ |
|
struct file *swap_file; /* seldom referenced */ |
|
unsigned int old_block_size; /* seldom referenced */ |
|
struct completion comp; /* seldom referenced */ |
|
#ifdef CONFIG_FRONTSWAP |
|
unsigned long *frontswap_map; /* frontswap in-use, one bit per page */ |
|
atomic_t frontswap_pages; /* frontswap pages in-use counter */ |
|
#endif |
|
spinlock_t lock; /* |
|
* protect map scan related fields like |
|
* swap_map, lowest_bit, highest_bit, |
|
* inuse_pages, cluster_next, |
|
* cluster_nr, lowest_alloc, |
|
* highest_alloc, free/discard cluster |
|
* list. other fields are only changed |
|
* at swapon/swapoff, so are protected |
|
* by swap_lock. changing flags need |
|
* hold this lock and swap_lock. If |
|
* both locks need hold, hold swap_lock |
|
* first. |
|
*/ |
|
spinlock_t cont_lock; /* |
|
* protect swap count continuation page |
|
* list. |
|
*/ |
|
struct work_struct discard_work; /* discard worker */ |
|
struct swap_cluster_list discard_clusters; /* discard clusters list */ |
|
struct plist_node avail_lists[]; /* |
|
* entries in swap_avail_heads, one |
|
* entry per node. |
|
* Must be last as the number of the |
|
* array is nr_node_ids, which is not |
|
* a fixed value so have to allocate |
|
* dynamically. |
|
* And it has to be an array so that |
|
* plist_for_each_* can work. |
|
*/ |
|
}; |
|
|
|
#ifdef CONFIG_64BIT |
|
#define SWAP_RA_ORDER_CEILING 5 |
|
#else |
|
/* Avoid stack overflow, because we need to save part of page table */ |
|
#define SWAP_RA_ORDER_CEILING 3 |
|
#define SWAP_RA_PTE_CACHE_SIZE (1 << SWAP_RA_ORDER_CEILING) |
|
#endif |
|
|
|
struct vma_swap_readahead { |
|
unsigned short win; |
|
unsigned short offset; |
|
unsigned short nr_pte; |
|
#ifdef CONFIG_64BIT |
|
pte_t *ptes; |
|
#else |
|
pte_t ptes[SWAP_RA_PTE_CACHE_SIZE]; |
|
#endif |
|
}; |
|
|
|
static inline swp_entry_t folio_swap_entry(struct folio *folio) |
|
{ |
|
swp_entry_t entry = { .val = page_private(&folio->page) }; |
|
return entry; |
|
} |
|
|
|
static inline void folio_set_swap_entry(struct folio *folio, swp_entry_t entry) |
|
{ |
|
folio->private = (void *)entry.val; |
|
} |
|
|
|
/* linux/mm/workingset.c */ |
|
void workingset_age_nonresident(struct lruvec *lruvec, unsigned long nr_pages); |
|
void *workingset_eviction(struct folio *folio, struct mem_cgroup *target_memcg); |
|
void workingset_refault(struct folio *folio, void *shadow); |
|
void workingset_activation(struct folio *folio); |
|
|
|
/* Only track the nodes of mappings with shadow entries */ |
|
void workingset_update_node(struct xa_node *node); |
|
extern struct list_lru shadow_nodes; |
|
#define mapping_set_update(xas, mapping) do { \ |
|
if (!dax_mapping(mapping) && !shmem_mapping(mapping)) { \ |
|
xas_set_update(xas, workingset_update_node); \ |
|
xas_set_lru(xas, &shadow_nodes); \ |
|
} \ |
|
} while (0) |
|
|
|
/* linux/mm/page_alloc.c */ |
|
extern unsigned long totalreserve_pages; |
|
|
|
/* Definition of global_zone_page_state not available yet */ |
|
#define nr_free_pages() global_zone_page_state(NR_FREE_PAGES) |
|
|
|
|
|
/* linux/mm/swap.c */ |
|
void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages); |
|
void lru_note_cost_folio(struct folio *); |
|
void folio_add_lru(struct folio *); |
|
void folio_add_lru_vma(struct folio *, struct vm_area_struct *); |
|
void lru_cache_add(struct page *); |
|
void mark_page_accessed(struct page *); |
|
void folio_mark_accessed(struct folio *); |
|
|
|
extern atomic_t lru_disable_count; |
|
|
|
static inline bool lru_cache_disabled(void) |
|
{ |
|
return atomic_read(&lru_disable_count); |
|
} |
|
|
|
static inline void lru_cache_enable(void) |
|
{ |
|
atomic_dec(&lru_disable_count); |
|
} |
|
|
|
extern void lru_cache_disable(void); |
|
extern void lru_add_drain(void); |
|
extern void lru_add_drain_cpu(int cpu); |
|
extern void lru_add_drain_cpu_zone(struct zone *zone); |
|
extern void lru_add_drain_all(void); |
|
extern void deactivate_page(struct page *page); |
|
extern void mark_page_lazyfree(struct page *page); |
|
extern void swap_setup(void); |
|
|
|
extern void lru_cache_add_inactive_or_unevictable(struct page *page, |
|
struct vm_area_struct *vma); |
|
|
|
/* linux/mm/vmscan.c */ |
|
extern unsigned long zone_reclaimable_pages(struct zone *zone); |
|
extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order, |
|
gfp_t gfp_mask, nodemask_t *mask); |
|
|
|
#define MEMCG_RECLAIM_MAY_SWAP (1 << 1) |
|
#define MEMCG_RECLAIM_PROACTIVE (1 << 2) |
|
extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg, |
|
unsigned long nr_pages, |
|
gfp_t gfp_mask, |
|
unsigned int reclaim_options); |
|
extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem, |
|
gfp_t gfp_mask, bool noswap, |
|
pg_data_t *pgdat, |
|
unsigned long *nr_scanned); |
|
extern unsigned long shrink_all_memory(unsigned long nr_pages); |
|
extern int vm_swappiness; |
|
long remove_mapping(struct address_space *mapping, struct folio *folio); |
|
|
|
extern unsigned long reclaim_pages(struct list_head *page_list); |
|
#ifdef CONFIG_NUMA |
|
extern int node_reclaim_mode; |
|
extern int sysctl_min_unmapped_ratio; |
|
extern int sysctl_min_slab_ratio; |
|
#else |
|
#define node_reclaim_mode 0 |
|
#endif |
|
|
|
static inline bool node_reclaim_enabled(void) |
|
{ |
|
/* Is any node_reclaim_mode bit set? */ |
|
return node_reclaim_mode & (RECLAIM_ZONE|RECLAIM_WRITE|RECLAIM_UNMAP); |
|
} |
|
|
|
void check_move_unevictable_folios(struct folio_batch *fbatch); |
|
void check_move_unevictable_pages(struct pagevec *pvec); |
|
|
|
extern void kswapd_run(int nid); |
|
extern void kswapd_stop(int nid); |
|
|
|
#ifdef CONFIG_SWAP |
|
|
|
int add_swap_extent(struct swap_info_struct *sis, unsigned long start_page, |
|
unsigned long nr_pages, sector_t start_block); |
|
int generic_swapfile_activate(struct swap_info_struct *, struct file *, |
|
sector_t *); |
|
|
|
static inline unsigned long total_swapcache_pages(void) |
|
{ |
|
return global_node_page_state(NR_SWAPCACHE); |
|
} |
|
|
|
extern void free_swap_cache(struct page *page); |
|
extern void free_page_and_swap_cache(struct page *); |
|
extern void free_pages_and_swap_cache(struct page **, int); |
|
/* linux/mm/swapfile.c */ |
|
extern atomic_long_t nr_swap_pages; |
|
extern long total_swap_pages; |
|
extern atomic_t nr_rotate_swap; |
|
extern bool has_usable_swap(void); |
|
|
|
/* Swap 50% full? Release swapcache more aggressively.. */ |
|
static inline bool vm_swap_full(void) |
|
{ |
|
return atomic_long_read(&nr_swap_pages) * 2 < total_swap_pages; |
|
} |
|
|
|
static inline long get_nr_swap_pages(void) |
|
{ |
|
return atomic_long_read(&nr_swap_pages); |
|
} |
|
|
|
extern void si_swapinfo(struct sysinfo *); |
|
swp_entry_t folio_alloc_swap(struct folio *folio); |
|
bool folio_free_swap(struct folio *folio); |
|
void put_swap_folio(struct folio *folio, swp_entry_t entry); |
|
extern swp_entry_t get_swap_page_of_type(int); |
|
extern int get_swap_pages(int n, swp_entry_t swp_entries[], int entry_size); |
|
extern int add_swap_count_continuation(swp_entry_t, gfp_t); |
|
extern void swap_shmem_alloc(swp_entry_t); |
|
extern int swap_duplicate(swp_entry_t); |
|
extern int swapcache_prepare(swp_entry_t); |
|
extern void swap_free(swp_entry_t); |
|
extern void swapcache_free_entries(swp_entry_t *entries, int n); |
|
extern int free_swap_and_cache(swp_entry_t); |
|
int swap_type_of(dev_t device, sector_t offset); |
|
int find_first_swap(dev_t *device); |
|
extern unsigned int count_swap_pages(int, int); |
|
extern sector_t swapdev_block(int, pgoff_t); |
|
extern int __swap_count(swp_entry_t entry); |
|
extern int __swp_swapcount(swp_entry_t entry); |
|
extern int swp_swapcount(swp_entry_t entry); |
|
extern struct swap_info_struct *page_swap_info(struct page *); |
|
extern struct swap_info_struct *swp_swap_info(swp_entry_t entry); |
|
struct backing_dev_info; |
|
extern int init_swap_address_space(unsigned int type, unsigned long nr_pages); |
|
extern void exit_swap_address_space(unsigned int type); |
|
extern struct swap_info_struct *get_swap_device(swp_entry_t entry); |
|
sector_t swap_page_sector(struct page *page); |
|
|
|
static inline void put_swap_device(struct swap_info_struct *si) |
|
{ |
|
percpu_ref_put(&si->users); |
|
} |
|
|
|
#else /* CONFIG_SWAP */ |
|
static inline struct swap_info_struct *swp_swap_info(swp_entry_t entry) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline struct swap_info_struct *get_swap_device(swp_entry_t entry) |
|
{ |
|
return NULL; |
|
} |
|
|
|
static inline void put_swap_device(struct swap_info_struct *si) |
|
{ |
|
} |
|
|
|
#define get_nr_swap_pages() 0L |
|
#define total_swap_pages 0L |
|
#define total_swapcache_pages() 0UL |
|
#define vm_swap_full() 0 |
|
|
|
#define si_swapinfo(val) \ |
|
do { (val)->freeswap = (val)->totalswap = 0; } while (0) |
|
/* only sparc can not include linux/pagemap.h in this file |
|
* so leave put_page and release_pages undeclared... */ |
|
#define free_page_and_swap_cache(page) \ |
|
put_page(page) |
|
#define free_pages_and_swap_cache(pages, nr) \ |
|
release_pages((pages), (nr)); |
|
|
|
/* used to sanity check ptes in zap_pte_range when CONFIG_SWAP=0 */ |
|
#define free_swap_and_cache(e) is_pfn_swap_entry(e) |
|
|
|
static inline void free_swap_cache(struct page *page) |
|
{ |
|
} |
|
|
|
static inline int add_swap_count_continuation(swp_entry_t swp, gfp_t gfp_mask) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void swap_shmem_alloc(swp_entry_t swp) |
|
{ |
|
} |
|
|
|
static inline int swap_duplicate(swp_entry_t swp) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void swap_free(swp_entry_t swp) |
|
{ |
|
} |
|
|
|
static inline void put_swap_folio(struct folio *folio, swp_entry_t swp) |
|
{ |
|
} |
|
|
|
static inline int __swap_count(swp_entry_t entry) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int __swp_swapcount(swp_entry_t entry) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline int swp_swapcount(swp_entry_t entry) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline swp_entry_t folio_alloc_swap(struct folio *folio) |
|
{ |
|
swp_entry_t entry; |
|
entry.val = 0; |
|
return entry; |
|
} |
|
|
|
static inline bool folio_free_swap(struct folio *folio) |
|
{ |
|
return false; |
|
} |
|
|
|
static inline int add_swap_extent(struct swap_info_struct *sis, |
|
unsigned long start_page, |
|
unsigned long nr_pages, sector_t start_block) |
|
{ |
|
return -EINVAL; |
|
} |
|
#endif /* CONFIG_SWAP */ |
|
|
|
#ifdef CONFIG_THP_SWAP |
|
extern int split_swap_cluster(swp_entry_t entry); |
|
#else |
|
static inline int split_swap_cluster(swp_entry_t entry) |
|
{ |
|
return 0; |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_MEMCG |
|
static inline int mem_cgroup_swappiness(struct mem_cgroup *memcg) |
|
{ |
|
/* Cgroup2 doesn't have per-cgroup swappiness */ |
|
if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) |
|
return vm_swappiness; |
|
|
|
/* root ? */ |
|
if (mem_cgroup_disabled() || mem_cgroup_is_root(memcg)) |
|
return vm_swappiness; |
|
|
|
return memcg->swappiness; |
|
} |
|
#else |
|
static inline int mem_cgroup_swappiness(struct mem_cgroup *mem) |
|
{ |
|
return vm_swappiness; |
|
} |
|
#endif |
|
|
|
#ifdef CONFIG_ZSWAP |
|
extern u64 zswap_pool_total_size; |
|
extern atomic_t zswap_stored_pages; |
|
#endif |
|
|
|
#if defined(CONFIG_SWAP) && defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP) |
|
extern void __cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask); |
|
static inline void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask) |
|
{ |
|
if (mem_cgroup_disabled()) |
|
return; |
|
__cgroup_throttle_swaprate(page, gfp_mask); |
|
} |
|
#else |
|
static inline void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask) |
|
{ |
|
} |
|
#endif |
|
static inline void folio_throttle_swaprate(struct folio *folio, gfp_t gfp) |
|
{ |
|
cgroup_throttle_swaprate(&folio->page, gfp); |
|
} |
|
|
|
#if defined(CONFIG_MEMCG) && defined(CONFIG_SWAP) |
|
void mem_cgroup_swapout(struct folio *folio, swp_entry_t entry); |
|
int __mem_cgroup_try_charge_swap(struct folio *folio, swp_entry_t entry); |
|
static inline int mem_cgroup_try_charge_swap(struct folio *folio, |
|
swp_entry_t entry) |
|
{ |
|
if (mem_cgroup_disabled()) |
|
return 0; |
|
return __mem_cgroup_try_charge_swap(folio, entry); |
|
} |
|
|
|
extern void __mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages); |
|
static inline void mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages) |
|
{ |
|
if (mem_cgroup_disabled()) |
|
return; |
|
__mem_cgroup_uncharge_swap(entry, nr_pages); |
|
} |
|
|
|
extern long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg); |
|
extern bool mem_cgroup_swap_full(struct folio *folio); |
|
#else |
|
static inline void mem_cgroup_swapout(struct folio *folio, swp_entry_t entry) |
|
{ |
|
} |
|
|
|
static inline int mem_cgroup_try_charge_swap(struct folio *folio, |
|
swp_entry_t entry) |
|
{ |
|
return 0; |
|
} |
|
|
|
static inline void mem_cgroup_uncharge_swap(swp_entry_t entry, |
|
unsigned int nr_pages) |
|
{ |
|
} |
|
|
|
static inline long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg) |
|
{ |
|
return get_nr_swap_pages(); |
|
} |
|
|
|
static inline bool mem_cgroup_swap_full(struct folio *folio) |
|
{ |
|
return vm_swap_full(); |
|
} |
|
#endif |
|
|
|
#endif /* __KERNEL__*/ |
|
#endif /* _LINUX_SWAP_H */
|
|
|