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From: Alan Cox <alc@FreeBSD.org>
Date: Wed, 11 Mar 2009 14:55:04 +0000 (UTC)
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Subject: svn commit: r189698 - head/sys/amd64/amd64
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Author: alc
Date: Wed Mar 11 14:55:04 2009
New Revision: 189698
URL: http://svn.freebsd.org/changeset/base/189698

Log:
  Optimize the inner loop of pmap_copy().
  
  MFC after:	6 weeks

Modified:
  head/sys/amd64/amd64/pmap.c

Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c	Wed Mar 11 14:39:55 2009	(r189697)
+++ head/sys/amd64/amd64/pmap.c	Wed Mar 11 14:55:04 2009	(r189698)
@@ -3538,6 +3538,7 @@ pmap_copy(pmap_t dst_pmap, pmap_t src_pm
 
 		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_pm
 			 * 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));