From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f70.google.com (mail-pg0-f70.google.com [74.125.83.70]) by kanga.kvack.org (Postfix) with ESMTP id D5EC56B02B4 for ; Sun, 27 Aug 2017 20:28:21 -0400 (EDT) Received: by mail-pg0-f70.google.com with SMTP id t193so19880655pgc.4 for ; Sun, 27 Aug 2017 17:28:21 -0700 (PDT) Received: from lgeamrelo11.lge.com (LGEAMRELO11.lge.com. [156.147.23.51]) by mx.google.com with ESMTP id s10si9166923plj.788.2017.08.27.17.28.20 for ; Sun, 27 Aug 2017 17:28:20 -0700 (PDT) Date: Mon, 28 Aug 2017 09:28:57 +0900 From: Joonsoo Kim Subject: Re: [PATCH] mm/page_alloc: don't reserve ZONE_HIGHMEM for ZONE_MOVABLE request Message-ID: <20170828002857.GB9167@js1304-P5Q-DELUXE> References: <1503553546-27450-1-git-send-email-iamjoonsoo.kim@lge.com> <20170825002031.GD29701@js1304-P5Q-DELUXE> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Vlastimil Babka Cc: Andrew Morton , Michal Hocko , Mel Gorman , Johannes Weiner , "Aneesh Kumar K . V" , Minchan Kim , linux-mm@kvack.org, linux-kernel@vger.kernel.org On Fri, Aug 25, 2017 at 09:56:10AM +0200, Vlastimil Babka wrote: > 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. Seems reasonable. However, if there is a user who checks sysctl_lowmem_reserve_ratio entry for HIGHMEM and change it, suggested interface will cause a problem since it doesn't expose ratio for HIGHMEM. Am I missing something? Thanks. > > > 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