From owner-svn-src-stable@FreeBSD.ORG  Fri Jan  6 11:06:16 2012
Return-Path: <owner-svn-src-stable@FreeBSD.ORG>
Delivered-To: svn-src-stable@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 44C22106566B;
	Fri,  6 Jan 2012 11:06:16 +0000 (UTC) (envelope-from kib@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id 2EAF38FC0C;
	Fri,  6 Jan 2012 11:06:16 +0000 (UTC)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.4/8.14.4) with ESMTP id q06B6Gfj086851;
	Fri, 6 Jan 2012 11:06:16 GMT (envelope-from kib@svn.freebsd.org)
Received: (from kib@localhost)
	by svn.freebsd.org (8.14.4/8.14.4/Submit) id q06B6FIZ086849;
	Fri, 6 Jan 2012 11:06:15 GMT (envelope-from kib@svn.freebsd.org)
Message-Id: <201201061106.q06B6FIZ086849@svn.freebsd.org>
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Fri, 6 Jan 2012 11:06:15 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org
X-SVN-Group: stable-9
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r229695 - stable/9/sys/vm
X-BeenThere: svn-src-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: SVN commit messages for all the -stable branches of the src tree
	<svn-src-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-stable>, 
	<mailto:svn-src-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-stable>
List-Post: <mailto:svn-src-stable@freebsd.org>
List-Help: <mailto:svn-src-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-stable>,
	<mailto:svn-src-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 06 Jan 2012 11:06:16 -0000

Author: kib
Date: Fri Jan  6 11:06:15 2012
New Revision: 229695
URL: http://svn.freebsd.org/changeset/base/229695

Log:
  MFC r228838:
  Optimize the common case of msyncing the whole file mapping with
  MS_SYNC flag.

Modified:
  stable/9/sys/vm/vm_object.c
Directory Properties:
  stable/9/sys/   (props changed)

Modified: stable/9/sys/vm/vm_object.c
==============================================================================
--- stable/9/sys/vm/vm_object.c	Fri Jan  6 10:12:59 2012	(r229694)
+++ stable/9/sys/vm/vm_object.c	Fri Jan  6 11:06:15 2012	(r229695)
@@ -937,7 +937,7 @@ vm_object_sync(vm_object_t object, vm_oo
 	vm_object_t backing_object;
 	struct vnode *vp;
 	struct mount *mp;
-	int flags;
+	int flags, fsync_after;
 
 	if (object == NULL)
 		return;
@@ -970,11 +970,26 @@ vm_object_sync(vm_object_t object, vm_oo
 		(void) vn_start_write(vp, &mp, V_WAIT);
 		vfslocked = VFS_LOCK_GIANT(vp->v_mount);
 		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
-		flags = (syncio || invalidate) ? OBJPC_SYNC : 0;
-		flags |= invalidate ? OBJPC_INVAL : 0;
+		if (syncio && !invalidate && offset == 0 &&
+		    OFF_TO_IDX(size) == object->size) {
+			/*
+			 * If syncing the whole mapping of the file,
+			 * it is faster to schedule all the writes in
+			 * async mode, also allowing the clustering,
+			 * and then wait for i/o to complete.
+			 */
+			flags = 0;
+			fsync_after = TRUE;
+		} else {
+			flags = (syncio || invalidate) ? OBJPC_SYNC : 0;
+			flags |= invalidate ? (OBJPC_SYNC | OBJPC_INVAL) : 0;
+			fsync_after = FALSE;
+		}
 		VM_OBJECT_LOCK(object);
 		vm_object_page_clean(object, offset, offset + size, flags);
 		VM_OBJECT_UNLOCK(object);
+		if (fsync_after)
+			(void) VOP_FSYNC(vp, MNT_WAIT, curthread);
 		VOP_UNLOCK(vp, 0);
 		VFS_UNLOCK_GIANT(vfslocked);
 		vn_finished_write(mp);