Optimize the inner loop of pmap_copy().

MFC after:	6 weeks

This commit is contained in:

Alan Cox

2009-03-11 14:55:04 +00:00

parent a6b6eb6b6b

commit 802e54dc1f

1 changed files with 6 additions and 3 deletions

									
										sys/amd64/amd64/pmap.c
									
		+6
		-3
	
												View File
												
				@@ -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));