From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752078AbcKGHZN (ORCPT ); Mon, 7 Nov 2016 02:25:13 -0500 Received: from LGEAMRELO13.lge.com ([156.147.23.53]:55333 "EHLO lgeamrelo13.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751198AbcKGHZM (ORCPT ); Mon, 7 Nov 2016 02:25:12 -0500 X-Original-SENDERIP: 156.147.1.151 X-Original-MAILFROM: iamjoonsoo.kim@lge.com X-Original-SENDERIP: 10.177.222.138 X-Original-MAILFROM: iamjoonsoo.kim@lge.com Date: Mon, 7 Nov 2016 16:27:02 +0900 From: Joonsoo Kim To: Chen Feng Cc: Andrew Morton , Rik van Riel , Johannes Weiner , mgorman@techsingularity.net, Laura Abbott , Minchan Kim , Marek Szyprowski , Michal Nazarewicz , "Aneesh Kumar K.V" , Vlastimil Babka , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 2/6] mm/cma: introduce new zone, ZONE_CMA Message-ID: <20161107072702.GC21159@js1304-P5Q-DELUXE> References: <1476414196-3514-1-git-send-email-iamjoonsoo.kim@lge.com> <1476414196-3514-3-git-send-email-iamjoonsoo.kim@lge.com> <58184B28.8090405@hisilicon.com> <20161107061500.GA21159@js1304-P5Q-DELUXE> <58202881.5030004@hisilicon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <58202881.5030004@hisilicon.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 07, 2016 at 03:08:49PM +0800, Chen Feng wrote: > > > On 2016/11/7 14:15, Joonsoo Kim wrote: > > On Tue, Nov 01, 2016 at 03:58:32PM +0800, Chen Feng wrote: > >> Hello, I hava a question on cma zone. > >> > >> When we have cma zone, cma zone will be the highest zone of system. > >> > >> In android system, the most memory allocator is ION. Media system will > >> alloc unmovable memory from it. > >> > >> On low memory scene, will the CMA zone always do balance? > > > > Allocation request for low zone (normal zone) would not cause CMA zone > > to be balanced since it isn't helpful. > > > Yes. But the cma zone will run out soon. And it always need to do balance. > > How about use migrate cma before movable and let cma type to fallback movable. > > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1263745.html ZONE_CMA approach will act like as your solution. Could you elaborate more on the problem of zone approach? Thanks. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 729126B0069 for ; Mon, 7 Nov 2016 02:34:23 -0500 (EST) Received: by mail-pf0-f198.google.com with SMTP id n85so45687741pfi.4 for ; Sun, 06 Nov 2016 23:34:23 -0800 (PST) Received: from lgeamrelo13.lge.com (LGEAMRELO13.lge.com. [156.147.23.53]) by mx.google.com with ESMTP id e80si29786252pfl.8.2016.11.06.23.25.10 for ; Sun, 06 Nov 2016 23:25:11 -0800 (PST) Date: Mon, 7 Nov 2016 16:27:02 +0900 From: Joonsoo Kim Subject: Re: [PATCH v6 2/6] mm/cma: introduce new zone, ZONE_CMA Message-ID: <20161107072702.GC21159@js1304-P5Q-DELUXE> References: <1476414196-3514-1-git-send-email-iamjoonsoo.kim@lge.com> <1476414196-3514-3-git-send-email-iamjoonsoo.kim@lge.com> <58184B28.8090405@hisilicon.com> <20161107061500.GA21159@js1304-P5Q-DELUXE> <58202881.5030004@hisilicon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <58202881.5030004@hisilicon.com> Sender: owner-linux-mm@kvack.org List-ID: To: Chen Feng Cc: Andrew Morton , Rik van Riel , Johannes Weiner , mgorman@techsingularity.net, Laura Abbott , Minchan Kim , Marek Szyprowski , Michal Nazarewicz , "Aneesh Kumar K.V" , Vlastimil Babka , linux-mm@kvack.org, linux-kernel@vger.kernel.org On Mon, Nov 07, 2016 at 03:08:49PM +0800, Chen Feng wrote: > > > On 2016/11/7 14:15, Joonsoo Kim wrote: > > On Tue, Nov 01, 2016 at 03:58:32PM +0800, Chen Feng wrote: > >> Hello, I hava a question on cma zone. > >> > >> When we have cma zone, cma zone will be the highest zone of system. > >> > >> In android system, the most memory allocator is ION. Media system will > >> alloc unmovable memory from it. > >> > >> On low memory scene, will the CMA zone always do balance? > > > > Allocation request for low zone (normal zone) would not cause CMA zone > > to be balanced since it isn't helpful. > > > Yes. But the cma zone will run out soon. And it always need to do balance. > > How about use migrate cma before movable and let cma type to fallback movable. > > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1263745.html ZONE_CMA approach will act like as your solution. Could you elaborate more on the problem of zone approach? 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