osfmk/vm/vm_pageout.c

499 	 * Deal with the deallocation (last reference) of a pageout object
593 			if (m->reference)
659 	 * Account for the paging reference taken in vm_paging_object_allocate.
741  *		The page must be busy, but not hold a paging reference.
767 	 *	Create a paging reference to let us play with the object.
812 	 *	[The object reference from its allocation is donated
839  * paging reference to prevent deallocation or collapse when we
841  * is responsible for consuming this reference
1394 			 * a TLB flush isn't really needed here since at worst we'll miss the reference bit being
1396 			 * new reference happens. If no futher references happen on the page after that remote TLB flushes
1398 			 * by pageout_scan, which is just fine since the last reference would have happened quite far
1407 			 * FALSE indicates that we don't want a H/W clear reference
2078 				m->reference = FALSE;
2314 		 *	First, update the reference and dirty bits
2319 		if (m->reference == FALSE && m->pmapped == TRUE) {
2323 			        m->reference = TRUE;
2364 			if (m->reference == TRUE) {
2372                 if (m->reference || m->dirty) {
2378 		    (m->reference ||
2449 		 * preceding check for m->reference... if
2450 		 * we get here, then m->reference had to be
2454                  * m->reference and m->dirty
2974 		    * give back the activity_in_progress reference we
2976 		    * it with a paging_in_progress reference that will
3118 		    * give back the activity_in_progress reference we
3120 		    * it with a paging_in_progress reference that will
4447 	 * drop a reference on the map_object whether or
4859 				      (!((refmod_state & VM_MEM_REFERENCED) || dst_page->reference) || dst_page->throttled)) &&
6012 	 * hold a reference for the mapping
6033  * these (and release the reference on the UPL).  Having
6466 		 * modify or reference bits before
6630 				else if (m->reference)
6795 			 * so we need to drop the paging reference
6803 			  * we dontated the paging reference to
6805 			  * will drop this reference
7125 							 * reference this page... for
7202 			 * so we need to drop the paging reference
7210 			  * we dontated the paging reference to
7212 			  * will drop this reference
7666 			dst_page->reference = TRUE;
7938 			low_page->reference = dst_page->reference;
7943 			        low_page->reference = TRUE;
7974 		 * page queues lock must be held to set 'reference'
8080 		 * leave the dirty and reference bits on if they
8346  *	(by holding a VM map that has a reference
8347  * 	on it, for example, or taking an extra reference).
8772 	 * Take a paging-in-progress reference to keep the object
8852 	 * Clear the "reference" and "modified" bits.
8904 	 * Take a paging-in-progress reference to keep the object
9611 	 * Take a paging-in-progress reference to keep the object