From 7ba02c96b0efd6b4157956e636571283a44d6210 Mon Sep 17 00:00:00 2001
From: alc <alc@FreeBSD.org>
Date: Sun, 28 Jul 2002 05:46:47 +0000
Subject: [PATCH]  o Lock page queue accesses by vm_page_free().  o Increment
 cnt.v_dfree inside vm_pageout_page_free() rather than    at each call.

---
 sys/vm/vm_pageout.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index b9938c78b4f3..08319b86f456 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -619,6 +619,7 @@ vm_pageout_page_free(vm_page_t m) {
 	vm_page_busy(m);
 	vm_page_protect(m, VM_PROT_NONE);
 	vm_page_free(m);
+	cnt.v_dfree++;
 	if (type == OBJT_SWAP || type == OBJT_DEFAULT)
 		vm_object_deallocate(object);
 }
@@ -783,8 +784,9 @@ vm_pageout_scan(int pass)
 		 * Invalid pages can be easily freed
 		 */
 		if (m->valid == 0) {
+			vm_page_lock_queues();
 			vm_pageout_page_free(m);
-			cnt.v_dfree++;
+			vm_page_unlock_queues();
 			--page_shortage;
 
 		/*
@@ -1075,7 +1077,6 @@ vm_pageout_scan(int pass)
 		}
 		cache_rover = (cache_rover + PQ_PRIME2) & PQ_L2_MASK;
 		vm_pageout_page_free(m);
-		cnt.v_dfree++;
 	}
 	splx(s);
 	vm_page_unlock_queues();