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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 17 Jun 2013 06:21:42 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r251832 - stable/9/sys/kern
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Author: kib
Date: Mon Jun 17 06:21:42 2013
New Revision: 251832
URL: http://svnweb.freebsd.org/changeset/base/251832

Log:
  MFC r251322:
  Instead of yielding, pause for 1 tick when donating the current thread
  time to the owner of the vnode lock while iterating over the free vnode
  list.

Modified:
  stable/9/sys/kern/vfs_subr.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/kern/vfs_subr.c
==============================================================================
--- stable/9/sys/kern/vfs_subr.c	Mon Jun 17 06:15:52 2013	(r251831)
+++ stable/9/sys/kern/vfs_subr.c	Mon Jun 17 06:21:42 2013	(r251832)
@@ -4824,7 +4824,7 @@ restart:
 			if (ALWAYS_YIELD || should_yield()) {
 				TAILQ_INSERT_BEFORE(vp, *mvp, v_actfreelist);
 				mtx_unlock(&vnode_free_list_mtx);
-				kern_yield(PRI_USER);
+				pause("vnacti", 1);
 				mtx_lock(&vnode_free_list_mtx);
 				goto restart;
 			}