svn commit: r251832 - stable/9/sys/kern

[Konstantin Belousov]

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;
 			}