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From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Thu, 9 Sep 2010 13:32:58 +0000 (UTC)
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Subject: svn commit: r212360 - head/sys/vm
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Author: nwhitehorn
Date: Thu Sep  9 13:32:58 2010
New Revision: 212360
URL: http://svn.freebsd.org/changeset/base/212360

Log:
  On architectures with non-tree-based page tables like PowerPC, every page
  in a range must be checked when calling pmap_remove(). Calling
  pmap_remove() from vm_pageout_map_deactivate_pages() with the entire range
  of the map could result in attempting to demap an extraordinary number
  of pages (> 10^15), so iterate through each map entry and unmap each of
  them individually.
  
  MFC after:	6 weeks

Modified:
  head/sys/vm/vm_pageout.c

Modified: head/sys/vm/vm_pageout.c
==============================================================================
--- head/sys/vm/vm_pageout.c	Thu Sep  9 13:17:30 2010	(r212359)
+++ head/sys/vm/vm_pageout.c	Thu Sep  9 13:32:58 2010	(r212360)
@@ -701,8 +701,11 @@ vm_pageout_map_deactivate_pages(map, des
 	 * table pages.
 	 */
 	if (desired == 0 && nothingwired) {
-		pmap_remove(vm_map_pmap(map), vm_map_min(map),
-		    vm_map_max(map));
+		tmpe = map->header.next;
+		while (tmpe != &map->header) {
+			pmap_remove(vm_map_pmap(map), tmpe->start, tmpe->end);
+			tmpe = tmpe->next;
+		}
 	}
 	vm_map_unlock(map);
 }