svn commit: r324793 - head/sys/vm

[Konstantin Belousov]

Author: kib
Date: Fri Oct 20 08:25:49 2017
New Revision: 324793
URL: https://svnweb.freebsd.org/changeset/base/324793

Log:
  In vm_page_free_phys_pglist(), do not take vm_page_queue_free_mtx if
  there is nothing to do.
  
  Suggested by:	mjg
  Reviewed by:	alc
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week

Modified:
  head/sys/vm/vm_page.c

Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c	Fri Oct 20 08:20:15 2017	(r324792)
+++ head/sys/vm/vm_page.c	Fri Oct 20 08:25:49 2017	(r324793)
@@ -2857,6 +2857,8 @@ vm_page_free_phys_pglist(struct pglist *tq)
 {
 	vm_page_t m;
 
+	if (TAILQ_EMPTY(tq))
+		return;
 	mtx_lock(&vm_page_queue_free_mtx);
 	TAILQ_FOREACH(m, tq, listq)
 		vm_page_free_phys(m);