Author: alc
Date: Sun Sep 27 01:35:32 2015
New Revision: 288288
URL: https://svnweb.freebsd.org/changeset/base/288288
Log:
MFC r287121
Testing whether a page is dirty does not require the page lock.
Modified:
stable/10/sys/vm/vm_pageout.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/vm/vm_pageout.c
==============================================================================
--- stable/10/sys/vm/vm_pageout.c Sun Sep 27 01:33:43 2015
(r288287)
+++ stable/10/sys/vm/vm_pageout.c Sun Sep 27 01:35:32 2015
(r288288)
@@ -408,10 +408,13 @@ more:
ib = 0;
break;
}
- vm_page_lock(p);
vm_page_test_dirty(p);
- if (p->dirty == 0 ||
- p->queue != PQ_INACTIVE ||
+ if (p->dirty == 0) {
+ ib = 0;
+ break;
+ }
+ vm_page_lock(p);
+ if (p->queue != PQ_INACTIVE ||
p->hold_count != 0) { /* may be undergoing I/O */
vm_page_unlock(p);
ib = 0;
@@ -435,10 +438,11 @@ more:
if ((p = vm_page_next(ps)) == NULL || vm_page_busied(p))
break;
- vm_page_lock(p);
vm_page_test_dirty(p);
- if (p->dirty == 0 ||
- p->queue != PQ_INACTIVE ||
+ if (p->dirty == 0)
+ break;
+ vm_page_lock(p);
+ if (p->queue != PQ_INACTIVE ||
p->hold_count != 0) { /* may be undergoing I/O */
vm_page_unlock(p);
break;
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