Author: alc
Date: Thu Sep 28 17:55:41 2017
New Revision: 324087
URL: https://svnweb.freebsd.org/changeset/base/324087
Log:
Optimize vm_object_page_remove() by eliminating pointless calls to
pmap_remove_all(). If the object to which a page belongs has no
references, then that page cannot possibly be mapped.
Reviewed by: kib
MFC after: 1 week
Modified:
head/sys/vm/vm_object.c
Modified: head/sys/vm/vm_object.c
==============================================================================
--- head/sys/vm/vm_object.c Thu Sep 28 15:58:41 2017 (r324086)
+++ head/sys/vm/vm_object.c Thu Sep 28 17:55:41 2017 (r324087)
@@ -1990,7 +1990,8 @@ again:
goto again;
}
if (p->wire_count != 0) {
- if ((options & OBJPR_NOTMAPPED) == 0)
+ if ((options & OBJPR_NOTMAPPED) == 0 &&
+ object->ref_count != 0)
pmap_remove_all(p);
if ((options & OBJPR_CLEANONLY) == 0) {
p->valid = 0;
@@ -2007,12 +2008,13 @@ again:
KASSERT((p->flags & PG_FICTITIOUS) == 0,
("vm_object_page_remove: page %p is fictitious", p));
if ((options & OBJPR_CLEANONLY) != 0 && p->valid != 0) {
- if ((options & OBJPR_NOTMAPPED) == 0)
+ if ((options & OBJPR_NOTMAPPED) == 0 &&
+ object->ref_count != 0)
pmap_remove_write(p);
- if (p->dirty)
+ if (p->dirty != 0)
continue;
}
- if ((options & OBJPR_NOTMAPPED) == 0)
+ if ((options & OBJPR_NOTMAPPED) == 0 && object->ref_count != 0)
pmap_remove_all(p);
p->flags &= ~PG_ZERO;
if (vm_page_free_prep(p, false))
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