diff options
Diffstat (limited to 'sys/vm/vm_object.h')
| -rw-r--r-- | sys/vm/vm_object.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sys/vm/vm_object.h b/sys/vm/vm_object.h index d80b1d8..731c9e3 100644 --- a/sys/vm/vm_object.h +++ b/sys/vm/vm_object.h @@ -257,6 +257,30 @@ vm_object_set_flag(vm_object_t object, u_short bits) object->flags |= bits; } +/* + * Conditionally set the object's color, which (1) enables the allocation + * of physical memory reservations for anonymous objects and larger-than- + * superpage-sized named objects and (2) determines the first page offset + * within the object at which a reservation may be allocated. In other + * words, the color determines the alignment of the object with respect + * to the largest superpage boundary. When mapping named objects, like + * files or POSIX shared memory objects, the color should be set to zero + * before a virtual address is selected for the mapping. In contrast, + * for anonymous objects, the color may be set after the virtual address + * is selected. + * + * The object must be locked. + */ +static __inline void +vm_object_color(vm_object_t object, u_short color) +{ + + if ((object->flags & OBJ_COLORED) == 0) { + object->pg_color = color; + object->flags |= OBJ_COLORED; + } +} + void vm_object_clear_flag(vm_object_t object, u_short bits); void vm_object_pip_add(vm_object_t object, short i); void vm_object_pip_subtract(vm_object_t object, short i); |
