diff options
Diffstat (limited to 'sys/vm/vm_page.h')
| -rw-r--r-- | sys/vm/vm_page.h | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h index 8bf5146..e8049c4 100644 --- a/sys/vm/vm_page.h +++ b/sys/vm/vm_page.h @@ -107,6 +107,8 @@ struct vm_page { u_short wire_count; /* wired down maps refs (P) */ u_short flags; /* see below */ + short hold_count; /* page hold count */ + u_short act_count; /* page usage count */ vm_offset_t phys_addr; /* physical address of page */ }; @@ -209,7 +211,7 @@ simple_lock_data_t vm_page_queue_free_lock; (m)->flags &= ~PG_BUSY; \ if ((m)->flags & PG_WANTED) { \ (m)->flags &= ~PG_WANTED; \ - thread_wakeup((int) (m)); \ + wakeup((caddr_t) (m)); \ } \ } @@ -222,6 +224,8 @@ simple_lock_data_t vm_page_queue_free_lock; (mem)->flags = PG_BUSY | PG_CLEAN | PG_FAKE; \ vm_page_insert((mem), (object), (offset)); \ (mem)->wire_count = 0; \ + (mem)->hold_count = 0; \ + (mem)->act_count = 0; \ } void vm_page_activate __P((vm_page_t)); @@ -233,10 +237,32 @@ void vm_page_insert __P((vm_page_t, vm_object_t, vm_offset_t)); vm_page_t vm_page_lookup __P((vm_object_t, vm_offset_t)); void vm_page_remove __P((vm_page_t)); void vm_page_rename __P((vm_page_t, vm_object_t, vm_offset_t)); -void vm_page_startup __P((vm_offset_t *, vm_offset_t *)); +vm_offset_t vm_page_startup __P((vm_offset_t, vm_offset_t, vm_offset_t)); void vm_page_unwire __P((vm_page_t)); void vm_page_wire __P((vm_page_t)); boolean_t vm_page_zero_fill __P((vm_page_t)); + +/* + * Keep page from being freed by the page daemon + * much of the same effect as wiring, except much lower + * overhead and should be used only for *very* temporary + * holding ("wiring"). + */ +static inline void +vm_page_hold(mem) + vm_page_t mem; +{ + mem->hold_count++; +} + +static inline void +vm_page_unhold(mem) + vm_page_t mem; +{ + if( --mem->hold_count < 0) + panic("vm_page_unhold: hold count < 0!!!"); +} + #endif /* KERNEL */ #endif /* !_VM_PAGE_ */ |
