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);
}
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