Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754754AbdHYH5P (ORCPT ); Fri, 25 Aug 2017 03:57:15 -0400 Received: from mx2.suse.de ([195.135.220.15]:49327 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754667AbdHYH5O (ORCPT ); Fri, 25 Aug 2017 03:57:14 -0400 Subject: Re: [PATCH] mm/page_alloc: don't reserve ZONE_HIGHMEM for ZONE_MOVABLE request To: Joonsoo Kim Cc: Andrew Morton , Michal Hocko , Mel Gorman , Johannes Weiner , "Aneesh Kumar K . V" , Minchan Kim , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <1503553546-27450-1-git-send-email-iamjoonsoo.kim@lge.com> <20170825002031.GD29701@js1304-P5Q-DELUXE> From: Vlastimil Babka Message-ID: Date: Fri, 25 Aug 2017 09:56:10 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: <20170825002031.GD29701@js1304-P5Q-DELUXE> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 697 Lines: 21 On 08/25/2017 02:20 AM, Joonsoo Kim wrote: > On Thu, Aug 24, 2017 at 11:41:58AM +0200, Vlastimil Babka wrote: > > Hmm, this is already pointed by Minchan and I have answered that. > > lkml.kernel.org/r/<20170421013243.GA13966@js1304-desktop> > > If you have a better idea, please let me know. My idea is that size of sysctl_lowmem_reserve_ratio is ZONE_NORMAL+1 and it has no entries for zones > NORMAL. The setup_per_zone_lowmem_reserve() is adjusted to only set lower_zone->lowmem_reserve[j] for idx <= ZONE_NORMAL. I can't imagine somebody would want override the ratio for HIGHMEM or MOVABLE (where it has no effect anyway) so the simplest thing is not to expose it at all. > Thanks. >