sys/uvm/uvm_amap.c

474  * amap_wipeout: wipeout all anon's in an amap; then free the amap!
483 	struct vm_anon *anon;
505 			anon = chunk->ac_anon[slot];
507 			if (anon == NULL || anon->an_ref == 0)
509 			KASSERT(anon->an_lock == amap->am_lock);
514 			refs = --anon->an_ref;
516 				uvm_anfree(anon);
553 	struct vm_anon *anon;
669 			chunk->ac_anon[i] = anon = srcchunk->ac_anon[j];
670 			if (anon == NULL)
673 			KASSERT(anon->an_lock == srcamap->am_lock);
674 			KASSERT(anon->an_ref > 0);
676 			anon->an_ref++;
742 	struct vm_anon *anon, *nanon;
748 	 * loop because some other process could reorder the anon's in the
759 			anon = chunk->ac_anon[slot];
760 			pg = anon->an_page;
761 			KASSERT(anon->an_lock == amap->am_lock);
770 			 * if the anon ref count is one, we are safe (the child
773 			if (anon->an_ref <= 1)
787 			 * First - get a new anon and a page.
791 				/* the new anon will share the amap's lock */
811 			 * Copy the data and replace anon with the new one.
815 			anon->an_ref--;
816 			KASSERT(anon->an_ref > 0);
972 	struct vm_anon *anon;
989 		anon = chunk->ac_anon[curslot];
990 		KASSERT(anon->an_lock == amap->am_lock);
997 		/* drop anon reference count */
998 		refs = --anon->an_ref;
1000 			uvm_anfree(anon);
1004 		 * done with this anon, next ...!
1108 				struct vm_anon *anon;
1111 				anon = chunk->ac_anon[slot];
1113 				swslot = anon->an_swslot;
1120 				rv = uvm_anon_pagein(am, anon);
1204  * amap_populate: ensure that the amap can store an anon for the page at
1205  * offset. This function can sleep until memory to store the anon is
1227  * => anon must have the lock associated with this amap.
1230 amap_add(struct vm_aref *aref, vaddr_t offset, struct vm_anon *anon,
1263 	chunk->ac_anon[slot] = anon;