From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754050Ab1KESWq (ORCPT ); Sat, 5 Nov 2011 14:22:46 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:52878 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753895Ab1KESWp (ORCPT ); Sat, 5 Nov 2011 14:22:45 -0400 Date: Sat, 5 Nov 2011 19:22:44 +0100 From: Pavel Machek To: Barry Song Cc: linux-pm@lists.linux-foundation.org, rjw@sisk.pl, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Barry Song , Xiangzhen Ye Subject: Re: [PATCH] PM: HIBERNATION: skip the swap size check if the snapshot image size is anticipative Message-ID: <20111105182244.GB6772@elf.ucw.cz> References: <1320392176-3906-1-git-send-email-Barry.Song@csr.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1320392176-3906-1-git-send-email-Barry.Song@csr.com> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi! > From: Barry Song > > Current swsusp requires swap partitions even larger than real saved pages > due to the worst compress ratio: > but for an embedded system, which has limited storage space, then it might > can't give the big size partition to save snapshot. > In the another way, some embedded systems can definitely know the most size > needed for snapshot since they run some specific application lists. > So this patch provides the possibility for bootloader to tell kernel even > the system has a little snapshot partition, but it is still enough. > For example, if the system need to save 120MB memory, origin swsusp will require > a 130MB partition to save snapshot. but if users know 30MB is enough for them( > compressed image will be less than 30MB), they just make a 30MB > partition. Would it be better to have /sys/power/... entry which would allow configuring expected compression ratio at runtime? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html