Author: alc
Date: Mon Oct 2 07:14:32 2017
New Revision: 324189
URL: https://svnweb.freebsd.org/changeset/base/324189
Log:
When mdstart_swap() accesses a page that is already in the active queue,
mark the page as referenced rather than calling vm_page_activate(). This
allows the page's act_count to grow beyond ACT_INIT and better reflect
its usage. (See also r324146, which modified a function used by tmpfs,
uiomove_object_page(), to behave in the same way.)
Reviewed by: kib, markj
MFC after: 2 weeks
Modified:
head/sys/dev/md/md.c
Modified: head/sys/dev/md/md.c
==============================================================================
--- head/sys/dev/md/md.c Mon Oct 2 06:48:56 2017 (r324188)
+++ head/sys/dev/md/md.c Mon Oct 2 07:14:32 2017 (r324189)
@@ -1111,7 +1111,10 @@ mdstart_swap(struct md_s *sc, struct bio *bp)
if (m != NULL) {
vm_page_xunbusy(m);
vm_page_lock(m);
- vm_page_activate(m);
+ if (vm_page_active(m))
+ vm_page_reference(m);
+ else
+ vm_page_activate(m);
vm_page_unlock(m);
}
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