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from sean eric fagan:

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it seems to keep the vm system from deadlocking the system when it runs
out of swap + physical memory.
prevents the system from giving the last page(s) to anything but the
referenced "processes" (especially important is the pager process,
which should never have to wait for a free page).
This commit is contained in:
cgd 1993-04-09 15:54:56 +00:00
parent cf15785585
commit 3cac22992d
2 changed files with 9 additions and 6 deletions
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7
sys/vm/vm_fault.c
View File

@ -62,7 +62,7 @@
* rights to redistribute these changes.
*/
static char rcsid[] = "$Header: /cvsroot/src/sys/vm/Attic/vm_fault.c,v 1.1.1.1 1993/03/21 09:45:37 cgd Exp $";
static char rcsid[] = "$Header: /cvsroot/src/sys/vm/Attic/vm_fault.c,v 1.2 1993/04/09 15:54:56 cgd Exp $";
/*
* Page fault handling module.
@ -246,6 +246,7 @@ vm_fault(map, vaddr, fault_type, change_wiring)
PAGE_ASSERT_WAIT(m, !change_wiring);
UNLOCK_THINGS;
thread_wakeup(&vm_pages_needed); /* XXX! -- what does this do? */
thread_block();
wait_result = current_thread()->wait_result;
vm_object_deallocate(first_object);
@ -279,6 +280,7 @@ thread_wakeup(&vm_pages_needed); /* XXX! */
PAGE_ASSERT_WAIT(m, !change_wiring);
UNLOCK_THINGS;
thread_wakeup(&vm_pages_needed); /* XXX! -- what does this do? */
thread_block();
wait_result = current_thread()->wait_result;
vm_object_deallocate(first_object);
@ -528,7 +530,7 @@ thread_wakeup(&vm_pages_needed); /* XXX */
*/
vm_page_lock_queues();
vm_page_deactivate(m);
vm_page_activate(m);
pmap_page_protect(VM_PAGE_TO_PHYS(m), VM_PROT_NONE);
vm_page_unlock_queues();
@ -625,6 +627,7 @@ thread_wakeup(&vm_pages_needed); /* XXX */
copy_object->ref_count--;
vm_object_unlock(copy_object);
UNLOCK_THINGS;
thread_wakeup(&vm_pages_needed); /* XXX! -- what does this do? */
thread_block();
wait_result = current_thread()->wait_result;
vm_object_deallocate(first_object);

8
sys/vm/vm_map.c
View File

@ -272,10 +272,10 @@ vm_map_entry_t vm_map_entry_create(map)
vm_map_t map;
{
vm_map_entry_t entry;
extern vm_map_t kernel_map, kmem_map, mb_map, buffer_map;
extern vm_map_t kernel_map, kmem_map, mb_map, buffer_map, pager_map;
if (map == kernel_map || map == kmem_map || map == mb_map
|| map == buffer_map) {
|| map == buffer_map || map == pager_map) {
if (entry = kentry_free)
kentry_free = kentry_free->next;
} else
@ -296,10 +296,10 @@ void vm_map_entry_dispose(map, entry)
vm_map_t map;
vm_map_entry_t entry;
{
extern vm_map_t kernel_map, kmem_map, mb_map, buffer_map;
extern vm_map_t kernel_map, kmem_map, mb_map, buffer_map, pager_map;
if (map == kernel_map || map == kmem_map || map == mb_map
|| map == buffer_map) {
|| map == buffer_map || map == pager_map) {
entry->next = kentry_free;
kentry_free = entry;
} else