svn commit: r207214 - user/kmacy/head_page_lock_2/sys/vm
Kip Macy
kmacy at FreeBSD.org
Mon Apr 26 01:12:14 UTC 2010
Author: kmacy
Date: Mon Apr 26 01:12:13 2010
New Revision: 207214
URL: http://svn.freebsd.org/changeset/base/207214
Log:
My understanding (alc correct me if I'm wrong) is that we don't need protect wire_count if the page is unmanaged
and the wire count is 1
Modified:
user/kmacy/head_page_lock_2/sys/vm/vm_page.c
Modified: user/kmacy/head_page_lock_2/sys/vm/vm_page.c
==============================================================================
--- user/kmacy/head_page_lock_2/sys/vm/vm_page.c Sun Apr 25 23:51:05 2010 (r207213)
+++ user/kmacy/head_page_lock_2/sys/vm/vm_page.c Mon Apr 26 01:12:13 2010 (r207214)
@@ -1595,10 +1595,13 @@ void
vm_page_unwire(vm_page_t m, int activate)
{
- vm_page_lock_assert(m, MA_OWNED);
if (m->flags & PG_FICTITIOUS)
return;
if (m->wire_count > 0) {
+#ifdef INVARIANTS
+ if ((m->wire_count > 1) || !(m->flags & PG_UNMANAGED))
+ vm_page_lock_assert(m, MA_OWNED);
+#endif
m->wire_count--;
if (m->wire_count == 0) {
atomic_subtract_int(&cnt.v_wire_count, 1);
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