1 /*-
2  * SPDX-License-Identifier: (BSD-4-Clause AND MIT-CMU)
14  * The Mach Operating System project at Carnegie-Mellon University.
45  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
65  *  Pittsburgh PA 15213-3890
100 #include <vm/vm.h>
101 #include <vm/vm_param.h>
102 #include <vm/vm_kern.h>
103 #include <vm/vm_object.h>
104 #include <vm/vm_page.h>
105 #include <vm/vm_map.h>
106 #include <vm/vm_pageout.h>
107 #include <vm/vm_pager.h>
108 #include <vm/vm_phys.h>
109 #include <vm/vm_radix.h>
110 #include <vm/swap_pager.h>
111 #include <vm/vm_extern.h>
112 #include <vm/uma.h>
133 MTX_SYSINIT(vm_daemon, &vm_daemon_mtx, "vm daemon", MTX_DEF);
168  *	The object and map must be locked.
180 	if ((first_object->flags & OBJ_FICTITIOUS) != 0)  in vm_swapout_object_deactivate()
186 		if ((object->flags & OBJ_UNMANAGED) != 0 ||  in vm_swapout_object_deactivate()
187 		    blockcount_read(&object->paging_in_progress) > 0)  in vm_swapout_object_deactivate()
191 		if (object->shadow_count > 1)  in vm_swapout_object_deactivate()
205 		if ((backing_object = object->backing_object) == NULL)  in vm_swapout_object_deactivate()
217  * deactivate some number of pages in a map, try to do it fairly, but
221 vm_swapout_map_deactivate_pages(vm_map_t map, long desired)  in vm_swapout_map_deactivate_pages()  argument
227 	if (!vm_map_trylock_read(map))  in vm_swapout_map_deactivate_pages()
237 	VM_MAP_ENTRY_FOREACH(tmpe, map) {  in vm_swapout_map_deactivate_pages()
238 		if ((tmpe->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {  in vm_swapout_map_deactivate_pages()
239 			obj = tmpe->object.vm_object;  in vm_swapout_map_deactivate_pages()
241 				if (obj->shadow_count <= 1 &&  in vm_swapout_map_deactivate_pages()
243 				     bigobj->resident_page_count <  in vm_swapout_map_deactivate_pages()
244 				     obj->resident_page_count)) {  in vm_swapout_map_deactivate_pages()
252 		if (tmpe->wired_count > 0)  in vm_swapout_map_deactivate_pages()
257 		vm_swapout_object_deactivate(map->pmap, bigobj, desired);  in vm_swapout_map_deactivate_pages()
262 	 * do this search sort of wrong -- .text first is not the best idea.  in vm_swapout_map_deactivate_pages()
264 	VM_MAP_ENTRY_FOREACH(tmpe, map) {  in vm_swapout_map_deactivate_pages()
265 		if (pmap_resident_count(vm_map_pmap(map)) <= desired)  in vm_swapout_map_deactivate_pages()
267 		if ((tmpe->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) {  in vm_swapout_map_deactivate_pages()
268 			obj = tmpe->object.vm_object;  in vm_swapout_map_deactivate_pages()
271 				vm_swapout_object_deactivate(map->pmap, obj,  in vm_swapout_map_deactivate_pages()
283 		pmap_remove(vm_map_pmap(map), vm_map_min(map),  in vm_swapout_map_deactivate_pages()
284 		    vm_map_max(map));  in vm_swapout_map_deactivate_pages()
287 	vm_map_unlock_read(map);  in vm_swapout_map_deactivate_pages()
296 	struct vmspace *vm;  in vm_daemon()  local
311 		 * process is swapped out -- deactivate pages  in vm_daemon()
326 			if (p->p_state != PRS_NORMAL ||  in vm_daemon()
327 			    p->p_flag & (P_INEXEC | P_SYSTEM | P_WEXIT)) {  in vm_daemon()
332 			 * if the process is in a non-running type state,  in vm_daemon()
359 			vm = vmspace_acquire_ref(p);  in vm_daemon()
362 			if (vm == NULL) {  in vm_daemon()
368 			size = vmspace_resident_count(vm);  in vm_daemon()
371 				    &vm->vm_map, limit);  in vm_daemon()
372 				size = vmspace_resident_count(vm);  in vm_daemon()
377 				if (p->p_state == PRS_NORMAL)  in vm_daemon()
391 						if (ravailable < rsize -  in vm_daemon()
393 							ravailable = rsize -  in vm_daemon()
398 					    &vm->vm_map,  in vm_daemon()
401 					size = vmspace_resident_count(vm);  in vm_daemon()
404 					if (p->p_state == PRS_NORMAL)  in vm_daemon()
411 			vmspace_free(vm);  in vm_daemon()