Author: kib
Date: Wed Oct 24 18:32:37 2012
New Revision: 242012
URL: http://svn.freebsd.org/changeset/base/242012
Log:
Commit the actual text provided by Alan, instead of the wrong update
in r242011.
MFC after: 1 week
Modified:
head/sys/vm/vm_fault.c
Modified: head/sys/vm/vm_fault.c
==============================================================================
--- head/sys/vm/vm_fault.c Wed Oct 24 18:21:59 2012 (r242011)
+++ head/sys/vm/vm_fault.c Wed Oct 24 18:32:37 2012 (r242012)
@@ -1287,11 +1287,13 @@ vm_fault_copy_entry(vm_map_t dst_map, vm
access &= ~VM_PROT_WRITE;
/*
- * Loop through all of the pages in the entry's range, copying
- * each one from the source object (it should be there) to the
- * destination object. Note that copied pages are not wired
- * and marked dirty to prevent reclamation without saving the
- * content into the swap file on pageout.
+ * Loop through all of the virtual pages within the entry's
+ * range, copying each page from the source object to the
+ * destination object. Since the source is wired, those pages
+ * must exist. In contrast, the destination is pageable.
+ * Since the destination object does share any backing storage
+ * with the source object, all of its pages must be dirtied,
+ * regardless of whether they can be written.
*/
for (vaddr = dst_entry->start, dst_pindex = 0;
vaddr < dst_entry->end;
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