Author: kib
Date: Thu May 20 08:51:01 2010
New Revision: 208340
URL: http://svn.freebsd.org/changeset/base/208340
Log:
When waiting for the busy page, do not unlock the object unless unlock
cannot be avoided.
Reviewed by: alc
MFC after: 1 week
Modified:
head/sys/vm/vm_fault.c
Modified: head/sys/vm/vm_fault.c
==============================================================================
--- head/sys/vm/vm_fault.c Thu May 20 08:43:31 2010 (r208339)
+++ head/sys/vm/vm_fault.c Thu May 20 08:51:01 2010 (r208340)
@@ -340,9 +340,13 @@ RetryFault:;
vm_page_flag_set(fs.m, PG_REFERENCED);
vm_page_unlock_queues();
vm_page_unlock(fs.m);
- VM_OBJECT_UNLOCK(fs.object);
if (fs.object != fs.first_object) {
- VM_OBJECT_LOCK(fs.first_object);
+ if (!VM_OBJECT_TRYLOCK(
+ fs.first_object)) {
+ VM_OBJECT_UNLOCK(fs.object);
+ VM_OBJECT_LOCK(fs.first_object);
+ VM_OBJECT_LOCK(fs.object);
+ }
vm_page_lock(fs.first_m);
vm_page_free(fs.first_m);
vm_page_unlock(fs.first_m);
@@ -351,7 +355,6 @@ RetryFault:;
fs.first_m = NULL;
}
unlock_map(&fs);
- VM_OBJECT_LOCK(fs.object);
if (fs.m == vm_page_lookup(fs.object,
fs.pindex)) {
vm_page_sleep_if_busy(fs.m, TRUE,
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