From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f173.google.com (mail-wi0-f173.google.com [209.85.212.173]) by kanga.kvack.org (Postfix) with ESMTP id C53E06B0253 for ; Wed, 29 Jul 2015 06:56:00 -0400 (EDT) Received: by wibud3 with SMTP id ud3so215371399wib.1 for ; Wed, 29 Jul 2015 03:56:00 -0700 (PDT) Received: from mail-wi0-x234.google.com (mail-wi0-x234.google.com. [2a00:1450:400c:c05::234]) by mx.google.com with ESMTPS id xa3si43104576wjc.106.2015.07.29.03.55.58 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 29 Jul 2015 03:55:59 -0700 (PDT) Received: by wibxm9 with SMTP id xm9so20591187wib.1 for ; Wed, 29 Jul 2015 03:55:58 -0700 (PDT) Date: Wed, 29 Jul 2015 12:55:54 +0200 From: Daniel Vetter Subject: Re: [PATCH 0/4] enable migration of driver pages Message-ID: <20150729105554.GU16722@phenom.ffwll.local> References: <1436776519-17337-1-git-send-email-gioh.kim@lge.com> <20150729104945.GA30872@techsingularity.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150729104945.GA30872@techsingularity.net> Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman Cc: Gioh Kim , jlayton@poochiereds.net, bfields@fieldses.org, vbabka@suse.cz, iamjoonsoo.kim@lge.com, viro@zeniv.linux.org.uk, mst@redhat.com, koct9i@gmail.com, minchan@kernel.org, aquini@redhat.com, linux-fsdevel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, linux-mm@kvack.org, dri-devel@lists.freedesktop.org, akpm@linux-foundation.org, Gioh Kim On Wed, Jul 29, 2015 at 11:49:45AM +0100, Mel Gorman wrote: > On Mon, Jul 13, 2015 at 05:35:15PM +0900, Gioh Kim wrote: > > My ARM-based platform occured severe fragmentation problem after long-term > > (several days) test. Sometimes even order-3 page allocation failed. It has > > memory size 512MB ~ 1024MB. 30% ~ 40% memory is consumed for graphic processing > > and 20~30 memory is reserved for zram. > > > > The primary motivation of this series is to reduce fragmentation by allowing > more kernel pages to be moved. Conceptually that is a worthwhile goal but > there should be at least one major in-kernel user and while balloon > pages were a good starting point, I think we really need to see what the > zram changes look like at the same time. I think gpu drivers really would be the perfect candidate for compacting kernel page allocations. And this also seems the primary motivation for this patch series, so I think that's really what we should use to judge these patches. Of course then there's the seemingly eternal chicken/egg problem of upstream gpu drivers for SoCs :( -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch -- 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