From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755683Ab0KBDxk (ORCPT ); Mon, 1 Nov 2010 23:53:40 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:42896 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755511Ab0KBDxg (ORCPT ); Mon, 1 Nov 2010 23:53:36 -0400 From: "Rafael J. Wysocki" To: "Daniel Taylor" Subject: Re: hibernate and file system/metadisk driver buffers/caches Date: Tue, 2 Nov 2010 04:52:45 +0100 User-Agent: KMail/1.13.5 (Linux/2.6.36-rjw+; KDE/4.4.4; x86_64; ; ) Cc: linux-kernel@vger.kernel.org References: <25B374CC0D9DFB4698BB331F82CD0CF20D601F@wdscexbe08.sc.wdc.com> In-Reply-To: <25B374CC0D9DFB4698BB331F82CD0CF20D601F@wdscexbe08.sc.wdc.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <201011020452.45203.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Monday, November 01, 2010, Daniel Taylor wrote: > From what I have found in Documentation/power, I should be > able to hibernate a system to a partition on flash, and > resume it, preserving its entire state. > > In case I missed something, though, does anyone know if, > in particular, MD stripe buffers are preserved, as well > as the EXTn/XFS buffers/caches? I think I read that I/O > buffers in use by drivers are saved only if the driver > has the appropriate suspend() interfaces. The entire contents of memory at the moment the image is created are saved. However, we need room for the image, so we free approximately 50% of memory before creating the image by creating artificial memory pressure. Thanks, Rafael