From 992a2cacdcd25ca37b429968cfc112d31325bffd Mon Sep 17 00:00:00 2001
From: dyson <dyson@FreeBSD.org>
Date: Fri, 24 May 1996 05:17:21 +0000
Subject: [PATCH] Eliminate inefficient check for dirty pages for pages in the
PQ_CACHE queue. Also, modify the MADV_FREE policy (it probably still isn't
the final version.)
---
sys/vm/vm_object.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/sys/vm/vm_object.c b/sys/vm/vm_object.c
index da2c62c4cdec..c5ce5c371fbf 100644
--- a/sys/vm/vm_object.c
+++ b/sys/vm/vm_object.c
@@ -61,7 +61,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
- * $Id: vm_object.c,v 1.72 1996/05/21 17:13:31 dyson Exp $
+ * $Id: vm_object.c,v 1.73 1996/05/23 00:45:58 dyson Exp $
*/
/*
@@ -516,6 +516,10 @@ rescan:
if ((tp->flags & PG_BUSY) ||
(tp->flags & PG_CLEANCHK) == 0)
break;
+ if (tp->queue == PQ_CACHE) {
+ tp->flags &= ~PG_CLEANCHK;
+ break;
+ }
vm_page_test_dirty(tp);
if ((tp->dirty & tp->valid) == 0) {
tp->flags &= ~PG_CLEANCHK;
@@ -536,6 +540,10 @@ rescan:
if ((tp->flags & PG_BUSY) ||
(tp->flags & PG_CLEANCHK) == 0)
break;
+ if (tp->queue == PQ_CACHE) {
+ tp->flags &= ~PG_CLEANCHK;
+ break;
+ }
vm_page_test_dirty(tp);
if ((tp->dirty & tp->valid) == 0) {
tp->flags &= ~PG_CLEANCHK;
@@ -740,8 +748,13 @@ vm_object_madvise(object, pindex, count, advise)
*/
if (object->type == OBJT_SWAP)
swap_pager_dmzspace(object, m->pindex, 1);
+/*
vm_page_protect(m, VM_PROT_NONE);
vm_page_free(m);
+*/
+ pmap_clear_modify(VM_PAGE_TO_PHYS(m));
+ m->dirty = 0;
+ vm_page_cache(m);
}
}
}