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Code Issues Releases Activity

Optimize the inner loop of pmap_copy().

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MFC after:	6 weeks
This commit is contained in:
Alan Cox 2009-03-11 14:55:04 +00:00
parent a6b6eb6b6b
commit 802e54dc1f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=189698
1 changed files with 6 additions and 3 deletions
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9
sys/amd64/amd64/pmap.c
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@ -3538,6 +3538,7 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len,
src_pte = (pt_entry_t *)PHYS_TO_DMAP(srcptepaddr);
src_pte = &src_pte[pmap_pte_index(addr)];
dstmpte = NULL;
while (addr < va_next) {
pt_entry_t ptetemp;
ptetemp = *src_pte;
@ -3545,9 +3546,11 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len,
* we only virtual copy managed pages
*/
if ((ptetemp & PG_MANAGED) != 0) {
dstmpte = pmap_allocpte(dst_pmap, addr,
M_NOWAIT);
if (dstmpte == NULL)
if (dstmpte != NULL &&
dstmpte->pindex == pmap_pde_pindex(addr))
dstmpte->wire_count++;
else if ((dstmpte = pmap_allocpte(dst_pmap,
addr, M_NOWAIT)) == NULL)
break;
dst_pte = (pt_entry_t *)
PHYS_TO_DMAP(VM_PAGE_TO_PHYS(dstmpte));