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Add vm_page_alloc1() and vm_page_free1(), which allocate/free single 

VM pages, not associated with any object.
This commit is contained in:
thorpej 1998-03-12 06:25:52 +00:00
parent 1f8d640c4b
commit d214d5c30a
2 changed files with 68 additions and 2 deletions
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66
sys/vm/vm_page.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_page.c,v 1.42 1998/03/01 02:24:01 fvdl Exp $ */
/* $NetBSD: vm_page.c,v 1.43 1998/03/12 06:25:52 thorpej Exp $ */
#define VM_PAGE_ALLOC_MEMORY_STATS
@ -1401,6 +1401,70 @@ vm_page_free(mem)
{
vm_page_remove(mem);
vm_page_free1(mem);
}
/*
* vm_page_alloc1:
*
* Allocate and return a memory cell with no associated object.
*/
vm_page_t
vm_page_alloc1()
{
vm_page_t mem;
int spl;
spl = splimp();
simple_lock(&vm_page_queue_free_lock);
if (vm_page_queue_free.tqh_first == NULL) {
simple_unlock(&vm_page_queue_free_lock);
splx(spl);
return (NULL);
}
mem = vm_page_queue_free.tqh_first;
TAILQ_REMOVE(&vm_page_queue_free, mem, pageq);
cnt.v_free_count--;
simple_unlock(&vm_page_queue_free_lock);
splx(spl);
mem->flags = PG_BUSY | PG_CLEAN | PG_FAKE;
mem->wire_count = 0;
/*
* Decide if we should poke the pageout daemon.
* We do this if the free count is less than the low
* water mark, or if the free count is less than the high
* water mark (but above the low water mark) and the inactive
* count is less than its target.
*
* We don't have the counts locked ... if they change a little,
* it doesn't really matter.
*/
if (cnt.v_free_count < cnt.v_free_min ||
(cnt.v_free_count < cnt.v_free_target &&
cnt.v_inactive_count < cnt.v_inactive_target))
thread_wakeup((void *)&vm_pages_needed);
return (mem);
}
/*
* vm_page_free1:
*
* Returns the given page to the free list.
*
* The page must already be disassociated with
* any objects.
*/
void
vm_page_free1(mem)
vm_page_t mem;
{
if (mem->flags & PG_ACTIVE) {
TAILQ_REMOVE(&vm_page_queue_active, mem, pageq);
mem->flags &= ~PG_ACTIVE;

4
sys/vm/vm_page.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: vm_page.h,v 1.25 1998/03/01 02:24:02 fvdl Exp $ */
/* $NetBSD: vm_page.h,v 1.26 1998/03/12 06:25:53 thorpej Exp $ */
/*
* Copyright (c) 1991, 1993
@ -330,6 +330,7 @@ static int vm_physseg_find __P((vm_offset_t, int *));
void vm_page_activate __P((vm_page_t));
vm_page_t vm_page_alloc __P((vm_object_t, vm_offset_t));
vm_page_t vm_page_alloc1 __P((void));
int vm_page_alloc_memory __P((vm_size_t size, vm_offset_t low,
vm_offset_t high, vm_offset_t alignment, vm_offset_t boundary,
struct pglist *rlist, int nsegs, int waitok));
@ -340,6 +341,7 @@ void vm_page_bootstrap __P((vm_offset_t *, vm_offset_t *));
void vm_page_copy __P((vm_page_t, vm_page_t));
void vm_page_deactivate __P((vm_page_t));
void vm_page_free __P((vm_page_t));
void vm_page_free1 __P((vm_page_t));
void vm_page_insert __P((vm_page_t, vm_object_t, vm_offset_t));
vm_page_t vm_page_lookup __P((vm_object_t, vm_offset_t));
#if defined(MACHINE_NEW_NONCONTIG)