From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f54.google.com (mail-wm0-f54.google.com [74.125.82.54]) by kanga.kvack.org (Postfix) with ESMTP id D4C726B0005 for ; Tue, 26 Jan 2016 13:53:49 -0500 (EST) Received: by mail-wm0-f54.google.com with SMTP id u188so119135136wmu.1 for ; Tue, 26 Jan 2016 10:53:49 -0800 (PST) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id lz8si3477317wjb.121.2016.01.26.10.53.48 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 26 Jan 2016 10:53:48 -0800 (PST) Subject: Re: [LSF/MM ATTEND] 2016: Requests to attend MM-summit References: <87k2n2usyf.fsf@linux.vnet.ibm.com> <20160122163801.GA16668@cmpxchg.org> <56A6B1A2.40903@redhat.com> <20160126073846.GC28254@js1304-P5Q-DELUXE> From: Vlastimil Babka Message-ID: <56A7C0B9.7040701@suse.cz> Date: Tue, 26 Jan 2016 19:53:45 +0100 MIME-Version: 1.0 In-Reply-To: <20160126073846.GC28254@js1304-P5Q-DELUXE> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Joonsoo Kim , Laura Abbott Cc: Johannes Weiner , "Aneesh Kumar K.V" , lsf-pc@lists.linux-foundation.org, Linux Memory Management List , Peter Zijlstra On 26.1.2016 8:38, Joonsoo Kim wrote: > On Mon, Jan 25, 2016 at 03:37:06PM -0800, Laura Abbott wrote: >> >> Is that series going to conflict with the work done for ZONE_DEVICE or run >> into similar problems? >> 033fbae988fcb67e5077203512181890848b8e90 (mm: ZONE_DEVICE for "device memory") >> has commit text about running out of ZONE_SHIFT bits and needing to get >> rid of ZONE_DMA instead so it seems like ZONE_CMA would run into the same >> problem. > > Hmm... I'm not sure. I need a investigation. What I did before is > enlarging section size. Then, number of section is reduced and we need > less section bit in struct page's flag. This worked for my sparsemem > configuration but I'm not sure other conguration. Perhaps, in other > congifuration, we can limit node bits and max number of node. This seems to be a solution proposed for the ZONE_DMA and ZONE_DEVICE coexistence https://lkml.org/lkml/2016/1/25/1233 It wouldn't help with ZONE_CMA, so I guess it's time to look for a more robust one. > Thanks. > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@kvack.org. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: email@kvack.org > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org