Author: alc
Date: Sun Jan 30 23:55:48 2011
New Revision: 218113
URL: http://svn.freebsd.org/changeset/base/218113
Log:
Release the free page queues lock earlier in vm_page_alloc().
Discussed with: kib@
Modified:
head/sys/vm/vm_page.c
Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c Sun Jan 30 23:29:45 2011 (r218112)
+++ head/sys/vm/vm_page.c Sun Jan 30 23:55:48 2011 (r218113)
@@ -1318,7 +1318,8 @@ vm_page_alloc(vm_object_t object, vm_pin
}
/*
- * Initialize structure. Only the PG_ZERO flag is inherited.
+ * Only the PG_ZERO flag is inherited. The PG_CACHED or PG_FREE flag
+ * must be cleared before the free page queues lock is released.
*/
flags = 0;
if (m->flags & PG_ZERO) {
@@ -1329,15 +1330,19 @@ vm_page_alloc(vm_object_t object, vm_pin
if (object == NULL || object->type == OBJT_PHYS)
flags |= PG_UNMANAGED;
m->flags = flags;
+ mtx_unlock(&vm_page_queue_free_mtx);
if (req & (VM_ALLOC_NOBUSY | VM_ALLOC_NOOBJ))
m->oflags = 0;
else
m->oflags = VPO_BUSY;
if (req & VM_ALLOC_WIRED) {
+ /*
+ * The page lock is not required for wiring a page until that
+ * page is inserted into the object.
+ */
atomic_add_int(&cnt.v_wire_count, 1);
m->wire_count = 1;
}
- mtx_unlock(&vm_page_queue_free_mtx);
m->act_count = 0;
if (object != NULL) {
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