diff options
Diffstat (limited to 'sys/vm/vm_page.h')
| -rw-r--r-- | sys/vm/vm_page.h | 40 |
1 files changed, 25 insertions, 15 deletions
diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h index 1dda1e2..5431d79 100644 --- a/sys/vm/vm_page.h +++ b/sys/vm/vm_page.h @@ -125,12 +125,13 @@ struct vm_page { struct md_page md; /* machine dependant stuff */ uint8_t queue; /* page queue index (P,Q) */ int8_t segind; - u_short flags; /* see below */ + short hold_count; /* page hold count (P) */ uint8_t order; /* index of the buddy queue */ uint8_t pool; u_short cow; /* page cow mapping count (P) */ u_int wire_count; /* wired down maps refs (P) */ - short hold_count; /* page hold count (P) */ + uint8_t aflags; /* access is atomic */ + uint8_t flags; /* see below, often immutable after alloc */ u_short oflags; /* page flags (O) */ u_char act_count; /* page usage count (O) */ u_char busy; /* page busy count (O) */ @@ -225,21 +226,29 @@ extern struct vpglocks pa_lock[]; /* * These are the flags defined for vm_page. * - * PG_REFERENCED may be cleared only if the object containing the page is + * aflags are updated by atomic accesses. Use the vm_page_aflag_set() + * and vm_page_aflag_clear() functions to set and clear the flags. + * + * PGA_REFERENCED may be cleared only if the object containing the page is * locked. * - * PG_WRITEABLE is set exclusively on managed pages by pmap_enter(). When it + * PGA_WRITEABLE is set exclusively on managed pages by pmap_enter(). When it * does so, the page must be VPO_BUSY. */ -#define PG_CACHED 0x0001 /* page is cached */ -#define PG_FREE 0x0002 /* page is free */ -#define PG_WINATCFLS 0x0004 /* flush dirty page on inactive q */ -#define PG_FICTITIOUS 0x0008 /* physical page doesn't exist (O) */ -#define PG_WRITEABLE 0x0010 /* page is mapped writeable */ -#define PG_ZERO 0x0040 /* page is zeroed */ -#define PG_REFERENCED 0x0080 /* page has been referenced */ -#define PG_MARKER 0x1000 /* special queue marker page */ -#define PG_SLAB 0x2000 /* object pointer is actually a slab */ +#define PGA_WRITEABLE 0x01 /* page may be mapped writeable */ +#define PGA_REFERENCED 0x02 /* page has been referenced */ + +/* + * Page flags. If changed at any other time than page allocation or + * freeing, the modification must be protected by the vm_page lock. + */ +#define PG_CACHED 0x01 /* page is cached */ +#define PG_FREE 0x02 /* page is free */ +#define PG_FICTITIOUS 0x04 /* physical page doesn't exist (O) */ +#define PG_ZERO 0x08 /* page is zeroed */ +#define PG_MARKER 0x10 /* special queue marker page */ +#define PG_SLAB 0x20 /* object pointer is actually a slab */ +#define PG_WINATCFLS 0x40 /* flush dirty page on inactive q */ /* * Misc constants. @@ -341,8 +350,8 @@ extern struct vpglocks vm_page_queue_lock; #define VM_ALLOC_COUNT_SHIFT 16 #define VM_ALLOC_COUNT(count) ((count) << VM_ALLOC_COUNT_SHIFT) -void vm_page_flag_set(vm_page_t m, unsigned short bits); -void vm_page_flag_clear(vm_page_t m, unsigned short bits); +void vm_page_aflag_set(vm_page_t m, uint8_t bits); +void vm_page_aflag_clear(vm_page_t m, uint8_t bits); void vm_page_busy(vm_page_t m); void vm_page_flash(vm_page_t m); void vm_page_io_start(vm_page_t m); @@ -377,6 +386,7 @@ vm_page_t vm_page_next(vm_page_t m); int vm_page_pa_tryrelock(pmap_t, vm_paddr_t, vm_paddr_t *); vm_page_t vm_page_prev(vm_page_t m); void vm_page_putfake(vm_page_t m); +void vm_page_reference(vm_page_t m); void vm_page_remove (vm_page_t); void vm_page_rename (vm_page_t, vm_object_t, vm_pindex_t); void vm_page_requeue(vm_page_t m); |
