osfmk/vm/vm_pageout.c

481 	 * Deal with the deallocation (last reference) of a pageout object
575 			if (m->reference)
641 	 * Account for the paging reference taken in vm_paging_object_allocate.
723  *		The page must be busy, but not hold a paging reference.
749 	 *	Create a paging reference to let us play with the object.
794 	 *	[The object reference from its allocation is donated
821  * paging reference to prevent deallocation or collapse when we
823  * is responsible for consuming this reference
1452 				 * a TLB flush isn't really needed here since at worst we'll miss the reference bit being
1454 				 * new reference happens. If no futher references happen on the page after that remote TLB flushes
1456 				 * by pageout_scan, which is just fine since the last reference would have happened quite far
1465 				 * FALSE indicates that we don't want a H/W clear reference
2128 				m->reference = FALSE;
2363 		 *	First, update the reference and dirty bits
2368 		if (m->reference == FALSE && m->pmapped == TRUE) {
2372 			        m->reference = TRUE;
2413 			if (m->reference == TRUE) {
2421                 if (m->reference || m->dirty) {
2426 		if (m->reference && !m->no_cache) {
2495 		 * preceding check for m->reference... if
2496 		 * we get here, then m->reference had to be
2500                  * m->reference and m->dirty
2996 		    * give back the activity_in_progress reference we
2998 		    * it with a paging_in_progress reference that will
3140 		    * give back the activity_in_progress reference we
3142 		    * it with a paging_in_progress reference that will
4053 	 * drop a reference on the map_object whether or
4392 				      (!((refmod_state & VM_MEM_REFERENCED) || dst_page->reference) || dst_page->throttled)) &&
5522 	 * hold a reference for the mapping
5543  * these (and release the reference on the UPL).  Having
5903 		 * modify or reference bits before
6064 				else if (m->reference)
6153 			 * so we need to drop the paging reference
6161 			  * we dontated the paging reference to
6163 			  * will drop this reference
6483 							 * reference this page... for
6560 			 * so we need to drop the paging reference
6568 			  * we dontated the paging reference to
6570 			  * will drop this reference
7103 			low_page->reference = dst_page->reference;
7108 			        low_page->reference = TRUE;
7139 		 * page queues lock must be held to set 'reference'
7241 		 * leave the dirty and reference bits on if they
7494  *	(by holding a VM map that has a reference
7495  * 	on it, for example, or taking an extra reference).
7917 	 * Take a paging-in-progress reference to keep the object
7997 	 * Clear the "reference" and "modified" bits.
8049 	 * Take a paging-in-progress reference to keep the object
8737 	 * Take a paging-in-progress reference to keep the object