allow the free page list to be shared by cpus.

Index: uvm/uvm.h
================================================== =================
RCS file: /home/tedu/cvs/src/sys/uvm/uvm.h,v
retrieving revision 1.21
diff -u -u -r1.21 uvm.h
--- uvm/uvm.h 18 Jun 2007 21:51:15 -0000 1.21
+++ uvm/uvm.h 26 Nov 2007 17:54:08 -0000
@@ -81,7 +81,7 @@
struct pglist page_inactive_swp;/* pages inactive (reclaim or free) */
struct pglist page_inactive_obj;/* pages inactive (reclaim or free) */
simple_lock_data_t pageqlock; /* lock for active/inactive page q */
- simple_lock_data_t fpageqlock; /* lock for free page q */
+ struct mutex fpageqlock; /* lock for free page q */
boolean_t page_init_done; /* TRUE if uvm_page_init() finished */
boolean_t page_idle_zero; /* TRUE if we should try to zero
pages in the idle loop */
Index: uvm/uvm_page.c
================================================== =================
RCS file: /home/tedu/cvs/src/sys/uvm/uvm_page.c,v
retrieving revision 1.61
diff -u -u -r1.61 uvm_page.c
--- uvm/uvm_page.c 18 Jun 2007 21:51:15 -0000 1.61
+++ uvm/uvm_page.c 26 Nov 2007 17:55:10 -0000
@@ -241,7 +241,7 @@
TAILQ_INIT(&uvm.page_inactive_swp);
TAILQ_INIT(&uvm.page_inactive_obj);
simple_lock_init(&uvm.pageqlock);
- simple_lock_init(&uvm.fpageqlock);
+ mtx_init(&uvm.fpageqlock, IPL_VM);

/*
* init the <obj,offset> => <page> hash table. for now
Index: uvm/uvm_page_i.h
================================================== =================
RCS file: /home/tedu/cvs/src/sys/uvm/uvm_page_i.h,v
retrieving revision 1.17
diff -u -u -r1.17 uvm_page_i.h
--- uvm/uvm_page_i.h 13 Apr 2007 18:57:49 -0000 1.17
+++ uvm/uvm_page_i.h 26 Nov 2007 17:53:39 -0000
@@ -91,11 +91,8 @@
PAGE_INLINE int
uvm_lock_fpageq(void)
{
- int s;
-
- s = splvm();
- simple_lock(&uvm.fpageqlock);
- return (s);
+ mtx_enter(&uvm.fpageqlock);
+ return (0);
}

/*
@@ -109,8 +106,7 @@
uvm_unlock_fpageq(int s)
{

- simple_unlock(&uvm.fpageqlock);
- splx(s);
+ mtx_leave(&uvm.fpageqlock);
}

/*