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On architectures with non-tree-based page tables like PowerPC, every page

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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
This commit is contained in:
Nathan Whitehorn 2010-09-09 13:32:58 +00:00
parent c14e163ad1
commit 42768fec0f
1 changed files with 5 additions and 2 deletions
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7
sys/vm/vm_pageout.c
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@ -701,8 +701,11 @@ vm_pageout_map_deactivate_pages(map, desired)
* 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);
}