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MFamd64 r313933: microoptimize pmap_protect_pde().

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Noted by:	alc
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2017-02-19 06:14:33 +00:00
parent ba0320553c
commit dab486441f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=313939
1 changed files with 3 additions and 3 deletions
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6
sys/i386/i386/pmap.c
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@ -3129,12 +3129,12 @@ pmap_protect_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t sva, vm_prot_t prot)
anychanged = FALSE;
retry:
oldpde = newpde = *pde;
if (oldpde & PG_MANAGED) {
if ((oldpde & (PG_MANAGED | PG_M | PG_RW)) ==
(PG_MANAGED | PG_M | PG_RW)) {
eva = sva + NBPDR;
for (va = sva, m = PHYS_TO_VM_PAGE(oldpde & PG_PS_FRAME);
va < eva; va += PAGE_SIZE, m++)
if ((oldpde & (PG_M | PG_RW)) == (PG_M | PG_RW))
vm_page_dirty(m);
vm_page_dirty(m);
}
if ((prot & VM_PROT_WRITE) == 0)
newpde &= ~(PG_RW | PG_M);