From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f169.google.com (mail-pd0-f169.google.com [209.85.192.169]) by kanga.kvack.org (Postfix) with ESMTP id 81AD86B00DC for ; Wed, 23 Oct 2013 17:59:46 -0400 (EDT) Received: by mail-pd0-f169.google.com with SMTP id q10so1490045pdj.28 for ; Wed, 23 Oct 2013 14:59:46 -0700 (PDT) Received: from psmtp.com ([74.125.245.160]) by mx.google.com with SMTP id hb3si32999pac.239.2013.10.23.14.59.44 for ; Wed, 23 Oct 2013 14:59:45 -0700 (PDT) Date: Thu, 24 Oct 2013 00:59:42 +0300 (EEST) From: =?UTF-8?B?0JjQstCw0LnQu9C+INCU0LjQvNC40YLRgNC+0LI=?= Message-ID: <1296360712.2526.1382565582863.JavaMail.apache@mail82.abv.bg> Subject: Re: OMAPFB: CMA allocation failures MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: tomi.valkeinen@ti.com Cc: sre@debian.org, tony@atomide.com, pali.rohar@gmail.com, pc+n900@asdf.org, pavel@ucw.cz, linux-kernel@vger.kernel.org, linux-mm@kvack.org Hi, I wonder if there is any progress on the issue? Do you need me to send more data? Or should I raise the issue with the CMA maintainer? Regards, Ivo >-------- D?N?D,D3D,D 1/2 D?D>>D 1/2 D 3/4 D?D,N?D 1/4 D 3/4 -------- >D?N?: D?D2D?D1D>>D 3/4 D?D,D 1/4 D,N?N?D 3/4 D2 >D?N?D 1/2 D 3/4 N?D 1/2 D 3/4 : Re: OMAPFB: CMA allocation failures >D?D 3/4 : Tomi Valkeinen >D?D.D?N?D?N?DuD 1/2 D 3/4 D 1/2 D?: D!N?N?D'D?, 2013, D?DoN?D 3/4 D 1/4 D2N?D, 16 09:33:51 EEST > > > Hi Tomi, > >>I think we should somehow find out what the pages are that cannot be >>migrated, and where they come from. >> >>So there are &quot;anonymous pages without mapping&quot; with page_count(page) != >>1. I have to say I don't know what that means =). I need to find some >>time to study the mm. > >I put some more traces in the point of failure, the result: >page_count(page) == 2, page->flags == 0x0008025D, which is: >PG_locked, PG_referenced, PG_uptodate, PG_dirty, PG_active, PG_arch_1, PG_unevictable >Whatever those mean :). I have no idea how to identify where those pages come from. > >>Well, as I said, you're the first one to report any errors, after the >>change being in use for a year. Maybe people just haven't used recent >>enough kernels, and the issue is only now starting to emerge, but I >>wouldn't draw any conclusions yet. > >I am (almost) sure I am the first one to test video playback on OMAP3 with DSP video >acceleration, using recent kernel and Maemo5 on n900 :). So there is high probability the >issue was not reported earlier because noone have tested it thoroughly after the change. > >>If the CMA would have big generic issues, I think we would've seen >>issues earlier. So I'm guessing it's some driver or app in your setup >>that's causing the issues. Maybe the driver/app is broken, or maybe that >>specific behavior is not handled well by CMA. In both case I think we >>need to identify what that driver/app is. > >What I know is going on, is that there is heavy fs I/O at the same time - there is >a thumbnailer process running in background which tries to extract thumbnails of all video >files in the system. Also, there are other processes doing various jobs (e-mail fetching, IM >accounts login, whatnot). And in addition Xorg mlocks parts of its address space. Of course >all this happens with lots of memory being swapped in and out. I guess all this is related. > >However, even after the system has settled, the CMA failures continue to happen. It looks like >some pages are allocated from CMA which should not be. > >>I wonder how I could try to reproduce this with a generic omap3 board... > >I can always reproduce it here (well, not on generic board, but I guess it is even better to >test in real-life conditions), so if you need some specific tests or traces or whatever, I >can do them for you. > >Regards, >Ivo > -- 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