Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758671AbcLAHno (ORCPT ); Thu, 1 Dec 2016 02:43:44 -0500 Received: from mx2.suse.de ([195.135.220.15]:34242 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757487AbcLAHnn (ORCPT ); Thu, 1 Dec 2016 02:43:43 -0500 Subject: Re: drm/radeon spamming alloc_contig_range: [xxx, yyy) PFNs busy busy To: Michal Hocko , "Robin H. Johnson" References: <20161130092239.GD18437@dhcp22.suse.cz> <20161130132848.GG18432@dhcp22.suse.cz> <20161201071507.GC18272@dhcp22.suse.cz> <20161201072119.GD18272@dhcp22.suse.cz> Cc: Michal Nazarewicz , linux-kernel@vger.kernel.org, linux-mm@kvack.org, dri-devel@lists.freedesktop.org, Joonsoo Kim From: Vlastimil Babka Message-ID: <9f2aa4e4-d7d5-e24f-112e-a4b43f0a0ccc@suse.cz> Date: Thu, 1 Dec 2016 08:43:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 MIME-Version: 1.0 In-Reply-To: <20161201072119.GD18272@dhcp22.suse.cz> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 687 Lines: 16 On 12/01/2016 08:21 AM, Michal Hocko wrote: > Forgot to CC Joonsoo. The email thread starts more or less here > http://lkml.kernel.org/r/20161130092239.GD18437@dhcp22.suse.cz > > On Thu 01-12-16 08:15:07, Michal Hocko wrote: >> On Wed 30-11-16 20:19:03, Robin H. Johnson wrote: >> [...] >> > alloc_contig_range: [83f2a3, 83f2a4) PFNs busy >> >> Huh, do I get it right that the request was for a _single_ page? Why do >> we need CMA for that? Ugh, good point. I assumed that was just the PFNs that it failed to migrate away, but it seems that's indeed the whole requested range. Yeah sounds some part of the dma-cma chain could be smarter and attempt CMA only for e.g. costly orders.