Author: alc
Date: Thu Sep 17 22:28:38 2015
New Revision: 287944
URL: https://svnweb.freebsd.org/changeset/base/287944
Log:
Eliminate (many) unnecessary calls to pmap_remove_all(). Pages from objects
with a reference count of zero can't possibly be mapped, so there is never a
need for vm_page_set_invalid() to call pmap_remove_all() on them.
Reviewed by: kib
MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division
Modified:
head/sys/vm/vm_page.c
Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c Thu Sep 17 22:07:40 2015 (r287943)
+++ head/sys/vm/vm_page.c Thu Sep 17 22:28:38 2015 (r287944)
@@ -3096,7 +3096,8 @@ vm_page_set_invalid(vm_page_t m, int bas
bits = VM_PAGE_BITS_ALL;
else
bits = vm_page_bits(base, size);
- if (m->valid == VM_PAGE_BITS_ALL && bits != 0)
+ if (object->ref_count != 0 && m->valid == VM_PAGE_BITS_ALL &&
+ bits != 0)
pmap_remove_all(m);
KASSERT((bits == 0 && m->valid == VM_PAGE_BITS_ALL) ||
!pmap_page_is_mapped(m),
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