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head/sys/kern/kern_sendfile.c
| Show First 20 Lines • Show All 122 Lines • ▼ Show 20 Lines | |||||
| /* | /* | ||||
| * Detach mapped page and release resources back to the system. Called | * Detach mapped page and release resources back to the system. Called | ||||
| * by mbuf(9) code when last reference to a page is freed. | * by mbuf(9) code when last reference to a page is freed. | ||||
| */ | */ | ||||
| static void | static void | ||||
| sendfile_free_page(vm_page_t pg, bool nocache) | sendfile_free_page(vm_page_t pg, bool nocache) | ||||
| { | { | ||||
| bool freed; | |||||
| vm_page_lock(pg); | vm_page_lock(pg); | ||||
| /* | /* | ||||
| * In either case check for the object going away on us. This can | * In either case check for the object going away on us. This can | ||||
| * happen since we don't hold a reference to it. If so, we're | * happen since we don't hold a reference to it. If so, we're | ||||
| * responsible for freeing the page. In 'noncache' case try to free | * responsible for freeing the page. In 'noncache' case try to free | ||||
| * the page, but only if it is cheap to. | * the page, but only if it is cheap to. | ||||
| */ | */ | ||||
| if (vm_page_unwire(pg, nocache ? PQ_NONE : PQ_INACTIVE)) { | if (vm_page_unwire_noq(pg)) { | ||||
| vm_object_t obj; | vm_object_t obj; | ||||
| if ((obj = pg->object) == NULL) | if ((obj = pg->object) == NULL) | ||||
| vm_page_free(pg); | vm_page_free(pg); | ||||
| else if (nocache) { | else { | ||||
| if (!vm_page_xbusied(pg) && VM_OBJECT_TRYWLOCK(obj)) { | freed = false; | ||||
| bool freed; | if (nocache && !vm_page_xbusied(pg) && | ||||
| VM_OBJECT_TRYWLOCK(obj)) { | |||||
| /* Only free unmapped pages. */ | /* Only free unmapped pages. */ | ||||
| if (obj->ref_count == 0 || | if (obj->ref_count == 0 || | ||||
| !pmap_page_is_mapped(pg)) | !pmap_page_is_mapped(pg)) | ||||
| /* | /* | ||||
| * The busy test before the object is | * The busy test before the object is | ||||
| * locked cannot be relied upon. | * locked cannot be relied upon. | ||||
| */ | */ | ||||
| freed = vm_page_try_to_free(pg); | freed = vm_page_try_to_free(pg); | ||||
| else | |||||
| freed = false; | |||||
| VM_OBJECT_WUNLOCK(obj); | VM_OBJECT_WUNLOCK(obj); | ||||
| if (!freed) | } | ||||
| if (!freed) { | |||||
| /* | |||||
| * If we were asked to not cache the page, place | |||||
| * it near the head of the inactive queue so | |||||
| * that it is reclaimed sooner. Otherwise, | |||||
| * maintain LRU. | |||||
| */ | |||||
| if (nocache) | |||||
| vm_page_deactivate_noreuse(pg); | vm_page_deactivate_noreuse(pg); | ||||
| } else | else if (pg->queue == PQ_ACTIVE) | ||||
| vm_page_deactivate_noreuse(pg); | vm_page_reference(pg); | ||||
| else if (pg->queue != PQ_INACTIVE) | |||||
| vm_page_deactivate(pg); | |||||
| else | |||||
| vm_page_requeue(pg); | |||||
| } | |||||
| } | } | ||||
| } | } | ||||
| vm_page_unlock(pg); | vm_page_unlock(pg); | ||||
| } | } | ||||
| static void | static void | ||||
| sendfile_free_mext(struct mbuf *m) | sendfile_free_mext(struct mbuf *m) | ||||
| { | { | ||||
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