diff options
Diffstat (limited to 'sys/vm/swap_pager.h')
| -rw-r--r-- | sys/vm/swap_pager.h | 44 |
1 files changed, 34 insertions, 10 deletions
diff --git a/sys/vm/swap_pager.h b/sys/vm/swap_pager.h index ceb88b619bc0..374223c0ccc3 100644 --- a/sys/vm/swap_pager.h +++ b/sys/vm/swap_pager.h @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * from: @(#)swap_pager.h 7.1 (Berkeley) 12/5/90 - * $Id: swap_pager.h,v 1.21 1998/04/29 04:28:02 dyson Exp $ + * $Id: swap_pager.h,v 1.22 1998/07/10 21:50:17 alex Exp $ */ /* @@ -59,26 +59,50 @@ #define SWB_NPAGES 8 #endif +/* + * Piecemeal swap metadata structure. Swap is stored in a radix tree. + * + * If SWB_NPAGES is 8 and sizeof(char *) == sizeof(daddr_t), our radix + * is basically 8. Assuming PAGE_SIZE == 4096, one tree level represents + * 32K worth of data, two levels represent 256K, three levels represent + * 2 MBytes. This is acceptable. + * + * Overall memory utilization is about the same as the old swap structure. + */ + +#define SWCORRECT(n) (sizeof(void *) * (n) / sizeof(daddr_t)) + +#define SWAP_META_PAGES (SWB_NPAGES * 2) +#define SWAP_META_MASK (SWAP_META_PAGES - 1) + struct swblock { - unsigned short swb_valid; /* bitmask for valid pages */ - unsigned short swb_locked; /* block locked */ - daddr_t swb_block[SWB_NPAGES]; + struct swblock *swb_hnext; + vm_object_t swb_object; + int swb_index; + int swb_count; + daddr_t swb_pages[SWAP_META_PAGES]; }; -typedef struct swblock *sw_blk_t; #ifdef KERNEL extern struct pagerlst swap_pager_un_object_list; extern int swap_pager_full; -extern struct rlisthdr swaplist; +extern struct blist *swapblist; + +int swap_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *)); +boolean_t swap_pager_haspage __P((vm_object_t object, vm_pindex_t pindex, int *before, int *after)); -int swap_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *)); int swap_pager_swp_alloc __P((vm_object_t, int)); -void swap_pager_copy __P((vm_object_t, vm_pindex_t, vm_object_t, - vm_pindex_t, vm_pindex_t, int)); +void swap_pager_copy __P((vm_object_t, vm_object_t, vm_pindex_t, int)); void swap_pager_freespace __P((vm_object_t, vm_pindex_t, vm_size_t)); void swap_pager_dmzspace __P((vm_object_t, vm_pindex_t, vm_size_t)); void swap_pager_swap_init __P((void)); -void swap_pager_sync __P((void)); + +/* + * newswap functions + */ + +void swap_pager_page_removed __P((vm_page_t, vm_object_t)); + #endif #endif /* _SWAP_PAGER_ */ |