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vm_mmap:

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Insure that device mappings get MAP_PREFAULT(_PARTIAL) set,
	so that 4M page mappings are used when possible.

Reviewed by:	Luoqi Chen <luoqi@watermarkgroup.com>
This commit is contained in:
alc 1999-06-05 18:21:53 +00:00
parent 758e37e0fb
commit 3d024af49f
1 changed files with 4 additions and 3 deletions
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7
sys/vm/vm_mmap.c
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@ -38,7 +38,7 @@
* from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
*
* @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
* $Id: vm_mmap.c,v 1.98 1999/05/16 05:07:33 alc Exp $
* $Id: vm_mmap.c,v 1.99 1999/05/17 00:53:56 alc Exp $
*/
/*
@ -1018,11 +1018,13 @@ vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
if (handle == NULL) {
object = NULL;
docow = 0;
} else {
object = vm_pager_allocate(type,
handle, objsize, prot, foff);
if (object == NULL)
return (type == OBJT_DEVICE ? EINVAL : ENOMEM);
docow = MAP_PREFAULT_PARTIAL;
}
/*
@ -1033,9 +1035,8 @@ vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
flags |= MAP_SHARED;
}
docow = 0;
if ((flags & (MAP_ANON|MAP_SHARED)) == 0) {
docow = MAP_COPY_ON_WRITE | MAP_PREFAULT_PARTIAL;
docow |= MAP_COPY_ON_WRITE;
}
#if defined(VM_PROT_READ_IS_EXEC)