From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [PATCH v2 3/3] PM / hibernate: Recycle safe pages after image restoration Date: Thu, 11 Aug 2016 23:06:15 +0200 Message-ID: <20160811210615.GA28618@amd> References: <2260927.OOWMYX738E@vostro.rjw.lan> <2448424.sR3JM3oiG3@vostro.rjw.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:58152 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932444AbcHKVGW (ORCPT ); Thu, 11 Aug 2016 17:06:22 -0400 Content-Disposition: inline In-Reply-To: <2448424.sR3JM3oiG3@vostro.rjw.lan> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: "Rafael J. Wysocki" Cc: Linux PM list , Linux Kernel Mailing List Hi! > From: Rafael J. Wysocki > > One of the memory bitmaps used by the hibernation image restoration > code is freed after the image has been loaded. > > That is not quite efficient, though, because the memory pages used > for building that bitmap are known to be safe (ie. they were not > used by the image kernel before hibernation) and the arch-specific > code finalizing the image restoration may need them. In that case > it needs to allocate those pages again via the memory management > subsystem, check if they are really safe again by consulting the > other bitmaps and so on. > > To avoid that, recycle those pages by putting them into the global > list of known safe pages so that they can be given to the arch code > right away when necessary. Ok, so you are trying to gain speed here? How much is the speedup? Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html