[src/trunk]: src/sys/uvm uvm_pagemarkdirty(): no need to set radix tree tag u...

[ad <ad%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/fe8aed6906d6
branches:  trunk
changeset: 972103:fe8aed6906d6
user:      ad <ad%NetBSD.org@localhost>
date:      Fri May 15 22:25:18 2020 +0000

description:
uvm_pagemarkdirty(): no need to set radix tree tag unless page is currently
marked clean.

diffstat:

 sys/uvm/uvm_page_status.c |  6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diffs (27 lines):

diff -r db97ee31cea0 -r fe8aed6906d6 sys/uvm/uvm_page_status.c
--- a/sys/uvm/uvm_page_status.c Fri May 15 22:22:44 2020 +0000
+++ b/sys/uvm/uvm_page_status.c Fri May 15 22:25:18 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: uvm_page_status.c,v 1.4 2020/03/14 20:45:23 ad Exp $   */
+/*     $NetBSD: uvm_page_status.c,v 1.5 2020/05/15 22:25:18 ad Exp $   */
 
 /*-
  * Copyright (c)2011 YAMAMOTO Takashi,
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_page_status.c,v 1.4 2020/03/14 20:45:23 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_page_status.c,v 1.5 2020/05/15 22:25:18 ad Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -108,7 +108,7 @@
                if (newstatus == UVM_PAGE_STATUS_CLEAN) {
                        radix_tree_clear_tag(&uobj->uo_pages, idx,
                            UVM_PAGE_DIRTY_TAG);
-               } else {
+               } else if (oldstatus == UVM_PAGE_STATUS_CLEAN) {
                        /*
                         * on first dirty page, mark the object dirty.
                         * for vnodes this inserts to the syncer worklist.