osfmk/vm/vm_pageout.c

164 #define	VM_PAGE_LAUNDRY_MAX	128UL	/* maximum pageouts on a given pageout queue */
213  *	The pageout daemon uses it to update vm_page_inactive_target.
217  *	then the pageout daemon starts running.
225  *	Once the pageout daemon starts running, it keeps going
235  *	The pageout daemon always starts running once vm_page_free_count
250  *	allows the pageout daemon and default pager (and any other
251  *	associated threads needed for default pageout) to continue
278  * Exported variable used to broadcast the activation of the pageout scan
334  *	These variables record the pageout daemon's actions:
362 unsigned int vm_pageout_cleaned_reclaimed = 0;		/* debugging; how many cleaned pages are reclaimed by the pageout scan */
363 unsigned int vm_pageout_cleaned_reactivated = 0;	/* debugging; how many cleaned pages are found to be referenced on pageout (and are therefore reactivated) */
499 	 * Deal with the deallocation (last reference) of a pageout object
504 	assert(object->pageout);
515 		assert(p->pageout);
516 		p->pageout = FALSE;
549 		if (m->pageout) {
554 			m->pageout = FALSE;
566 			 * pageout by checking the modify state.
629 			 * modified during the pageout. Note that we purposefully do
716 	new_m->pageout = TRUE;
739  *		The page in question must not be on any pageout queues.
774 		panic("reservation without pageout?"); /* alan */
799 	m->pageout = TRUE;
843  * The page must not be on any pageout queue.
847 vm_pageout_cluster(vm_page_t m, boolean_t pageout)
867 	assert(!m->cleaning && !m->pageout && !m->laundry);
878 	m->pageout = pageout;
1154  * function in BSD to apply I/O throttle to the pageout thread
1209  *	vm_pageout_scan does the dirty work for the pageout daemon.
1292 	 *	for clean pages if the pageout queues don't drain in a timely
1293 	 *	fashion since this may indicate that the pageout paths are
1476 			 * make sure the pageout I/O threads are running
1674 		 *	3) Flow control - default pageout queue is full
1734 					 * the pageout thread for the default pager is potentially
1809 				 * cause us to pause the pageout scan thread
1814 				 * before we return, make sure the pageout I/O threads
1863 				 * stall the pageout scan
2021 		 * it can't also be on the pageout queue, so safe
2307 				panic("\"busy\" page considered for pageout\n");
2330 		 *   if (m->cleaning && !m->pageout)
2340 		 *   if (m->pageout && !m->cleaning)
2348 		 *   if (m->pageout && m->clenaing)
2355 		 * page with m->pageout and still on the queues means that an
2358 		if (m->pageout) {
2493 				 *  a) The external pageout thread is stuck on the truncate lock for a file that is being extended i.e. written.
2498 				 *  a) the external pageout queue is throttled
2502 				 * since we don't know the reason for the external pageout queue being throttled we
2509 				 * the deadlock will break, the external pageout queue will empty and it will no longer
2670 		 * do NOT set the pageout bit!
2725 		 * back to top of pageout scan loop
2774  *	vm_pageout is the high level pageout daemon.
2880 			    * been put back on the pageout queue), or
2884 			    * we took when we put the page on the pageout queue
2913 				   m->pageout = FALSE;
2941 			   if (m->pageout) {
2986 		    * any pageout clustering happens there
3065 			    * been put back on the pageout queue), or
3069 			    * we took when we put the page on the pageout queue
3085 			   if (m->pageout) {
3130 		    * any pageout clustering happens there
3259 					m->pageout = FALSE;
3284 					if (m->pageout) {
3364 			m->pageout = FALSE;
3902 	/* internal pageout thread started when default pager registered first time */
3903 	/* external pageout and garbage collection threads started here */
4448 	 * not a pageout object is inserted
4695 		upl->map_object->pageout = TRUE;
4935 					 * we've buddied up a page for a clustered pageout
4936 					 * that has already been moved to the pageout
4947 			 * pageout statistics gathering.  count
4952 			if (dst_page->pageout)
4986 				 * convenient even for the pageout
5032 					dst_page->pageout = TRUE;
5105 					dst_page->pageout = FALSE;
5254 				 * convenient even for the pageout
5324 			user_page_list[entry].pageout	= dst_page->pageout;
5487 		        panic("vm_object_super_upl_request: Missed target pageout"
5885 		upl->map_object->pageout = TRUE;
5918 				alias_page->pageout = TRUE;
6332 				t->pageout = FALSE;
6480 			m->pageout = FALSE;
6533 		if (m->pageout) {
6536 			 * no longer set the pageout bit. It's pages now go
6541 			m->pageout = FALSE;
6549 				 * the pageout... reactivate it since
6988 			        t->pageout = FALSE;
7111 				m->pageout = FALSE;
7691 				user_page_list[entry].pageout	= FALSE;
7896 			dst_page->pageout = FALSE;
7999 			user_page_list[entry].pageout	= dst_page->pageout;
8258  * pages it gathers for pageout be encrypted, via the UPL interfaces,
8652 	 * pageout thread (we won't pagein before there's been a pageout)
8653 	 * and there's only one pageout thread.
9075 	if (upl_object->pageout) {
9762 		if(m->pageout) pgopages++;
9779 		assert(!m->pageout);
9793 		if(m->pageout) pgopages++;
9815 		if(m->pageout) pgopages++;