From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758219Ab3E3VWF (ORCPT ); Thu, 30 May 2013 17:22:05 -0400 Received: from e37.co.us.ibm.com ([32.97.110.158]:51559 "EHLO e37.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757547Ab3E3VVx (ORCPT ); Thu, 30 May 2013 17:21:53 -0400 Date: Thu, 30 May 2013 16:20:17 -0500 From: Seth Jennings To: Andrew Morton , Mel Gorman Cc: Dan Magenheimer , Greg Kroah-Hartman , Nitin Gupta , Minchan Kim , Konrad Wilk , Robert Jennings , Jenifer Hopper , Johannes Weiner , Rik van Riel , Larry Woodman , Benjamin Herrenschmidt , Dave Hansen , Joe Perches , Joonsoo Kim , Cody P Schafer , Hugh Dickens , Paul Mackerras , Heesub Shin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org Subject: Re: [PATCHv12 2/4] zbud: add to mm/ Message-ID: <20130530212017.GB15837@medulla> References: <1369067168-12291-1-git-send-email-sjenning@linux.vnet.ibm.com> <1369067168-12291-3-git-send-email-sjenning@linux.vnet.ibm.com> <20130528145911.bd484cbb0bb7a27c1623c520@linux-foundation.org> <20130529154500.GB428@cerebellum> <20130529113434.b2ced4cc1e66c7a0a520d908@linux-foundation.org> <20130529204236.GD428@cerebellum> <20130529134835.58dd89774f47205da4a06202@linux-foundation.org> <754ae8a0-23af-4c87-953f-d608cba84191@default> <20130529142904.ace2a29b90a9076d0ee251fd@linux-foundation.org> <20130530174344.GA15837@medulla> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130530174344.GA15837@medulla> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13053021-7408-0000-0000-000010BEAA1A Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Andrew, Mel, This struct page stuffing is taking a lot of time to work out and _might_ be fraught with peril when memmap peekers are considered. What do you think about just storing the zbud page metadata inline in the memory page in the first zbud page chunk? Mel, this kinda hurts you plans for making NCHUNKS = 2, since there would only be one chunk available for storage and would make zbud useless. Just a way to sidestep this whole issue. What do you think? Seth