diff options
Diffstat (limited to 'include/linux/swap.h')
| -rw-r--r-- | include/linux/swap.h | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h index e73799d..bd6e937 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -150,6 +150,7 @@ enum { SWP_BLKDEV = (1 << 6), /* its a block device */ /* add others here before... */ SWP_SCANNING = (1 << 8), /* refcount in scan_swap_map */ + SWP_FAST = (1 << 9), /* blkdev access is fast and cheap */ }; #define SWAP_CLUSTER_MAX 32 @@ -201,9 +202,6 @@ struct swap_list_t { int next; /* swapfile to be used next */ }; -/* Swap 50% full? Release swapcache more aggressively.. */ -#define vm_swap_full() (nr_swap_pages*2 < total_swap_pages) - /* linux/mm/page_alloc.c */ extern unsigned long totalram_pages; extern unsigned long totalreserve_pages; @@ -320,6 +318,21 @@ extern struct page *swapin_readahead(swp_entry_t, gfp_t, /* linux/mm/swapfile.c */ extern long nr_swap_pages; extern long total_swap_pages; +extern bool is_swap_fast(swp_entry_t entry); + +/* Swap 50% full? Release swapcache more aggressively.. */ +static inline bool vm_swap_full(struct swap_info_struct *si) +{ + /* + * If the swap device is fast, return true + * not to delay swap free. + */ + if (si->flags & SWP_FAST) + return true; + + return nr_swap_pages*2 < total_swap_pages; +} + extern void si_swapinfo(struct sysinfo *); extern swp_entry_t get_swap_page(void); extern swp_entry_t get_swap_page_of_type(int); @@ -335,6 +348,7 @@ extern int swap_type_of(dev_t, sector_t, struct block_device **); extern unsigned int count_swap_pages(int, int); extern sector_t map_swap_page(struct page *, struct block_device **); extern sector_t swapdev_block(int, pgoff_t); +extern struct swap_info_struct *page_swap_info(struct page *); extern int reuse_swap_page(struct page *); extern int try_to_free_swap(struct page *); struct backing_dev_info; @@ -379,6 +393,7 @@ static inline void mem_cgroup_uncharge_swap(swp_entry_t ent) #define nr_swap_pages 0L #define total_swap_pages 0L #define total_swapcache_pages 0UL +#define vm_swap_full(si) 0 #define si_swapinfo(val) \ do { (val)->freeswap = (val)->totalswap = 0; } while (0) |