diff options
Diffstat (limited to 'sys/vm/vm_object.c')
| -rw-r--r-- | sys/vm/vm_object.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c index 3de793b..600dea8 100644 --- a/sys/vm/vm_object.c +++ b/sys/vm/vm_object.c @@ -1863,6 +1863,60 @@ skipmemq: } /* + * vm_object_page_cache: + * + * For the given object, attempt to move the specified clean + * pages to the cache queue. If a page is wired for any reason, + * then it will not be changed. Pages are specified by the given + * range ["start", "end"). As a special case, if "end" is zero, + * then the range extends from "start" to the end of the object. + * Any mappings to the specified pages are removed before the + * pages are moved to the cache queue. + * + * This operation should only be performed on objects that + * contain managed pages. + * + * The object must be locked. + */ +void +vm_object_page_cache(vm_object_t object, vm_pindex_t start, vm_pindex_t end) +{ + struct mtx *mtx, *new_mtx; + vm_page_t p, next; + + VM_OBJECT_LOCK_ASSERT(object, MA_OWNED); + KASSERT((object->type != OBJT_DEVICE && object->type != OBJT_SG && + object->type != OBJT_PHYS), + ("vm_object_page_cache: illegal object %p", object)); + if (object->resident_page_count == 0) + return; + p = vm_page_find_least(object, start); + + /* + * Here, the variable "p" is either (1) the page with the least pindex + * greater than or equal to the parameter "start" or (2) NULL. + */ + mtx = NULL; + for (; p != NULL && (p->pindex < end || end == 0); p = next) { + next = TAILQ_NEXT(p, listq); + + /* + * Avoid releasing and reacquiring the same page lock. + */ + new_mtx = vm_page_lockptr(p); + if (mtx != new_mtx) { + if (mtx != NULL) + mtx_unlock(mtx); + mtx = new_mtx; + mtx_lock(mtx); + } + vm_page_try_to_cache(p); + } + if (mtx != NULL) + mtx_unlock(mtx); +} + +/* * Populate the specified range of the object with valid pages. Returns * TRUE if the range is successfully populated and FALSE otherwise. * |
