Author: jhb
Date: Fri Jun 29 17:12:26 2012
New Revision: 237804
URL: http://svn.freebsd.org/changeset/base/237804
Log:
MFC 237334:
Move the per-thread deferred user map entries list into a private list
in vm_map_process_deferred() which is then iterated to release map entries.
This avoids having a nested vm map unlock operation called from the loop
body attempt to recuse into vm_map_process_deferred(). This can happen if
the vm_map_remove() triggers the OOM killer.
Modified:
stable/8/sys/vm/vm_map.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/boot/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
stable/8/sys/dev/e1000/ (props changed)
Modified: stable/8/sys/vm/vm_map.c
==============================================================================
--- stable/8/sys/vm/vm_map.c Fri Jun 29 17:12:03 2012 (r237803)
+++ stable/8/sys/vm/vm_map.c Fri Jun 29 17:12:26 2012 (r237804)
@@ -457,13 +457,15 @@ static void
vm_map_process_deferred(void)
{
struct thread *td;
- vm_map_entry_t entry;
+ vm_map_entry_t entry, next;
td = curthread;
-
- while ((entry = td->td_map_def_user) != NULL) {
- td->td_map_def_user = entry->next;
+ entry = td->td_map_def_user;
+ td->td_map_def_user = NULL;
+ while (entry != NULL) {
+ next = entry->next;
vm_map_entry_deallocate(entry, FALSE);
+ entry = next;
}
}
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