From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qk0-f178.google.com (mail-qk0-f178.google.com [209.85.220.178]) by kanga.kvack.org (Postfix) with ESMTP id D6A736B0074 for ; Wed, 17 Jun 2015 21:26:01 -0400 (EDT) Received: by qkbp125 with SMTP id p125so32109419qkb.2 for ; Wed, 17 Jun 2015 18:26:01 -0700 (PDT) Received: from szxga03-in.huawei.com (szxga03-in.huawei.com. [119.145.14.66]) by mx.google.com with ESMTPS id d68si6325411qka.18.2015.06.17.18.25.59 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Wed, 17 Jun 2015 18:26:01 -0700 (PDT) Message-ID: <55821D85.3070208@huawei.com> Date: Thu, 18 Jun 2015 09:23:17 +0800 From: Xishi Qiu MIME-Version: 1.0 Subject: Re: [RFC PATCH 00/12] mm: mirrored memory support for page buddy allocations References: <55704A7E.5030507@huawei.com> <557FD5F8.10903@suse.cz> <557FDB9B.1090105@huawei.com> <557FF06A.3020000@suse.cz> In-Reply-To: <557FF06A.3020000@suse.cz> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Vlastimil Babka Cc: Andrew Morton , nao.horiguchi@gmail.com, Yinghai Lu , "H. Peter Anvin" , Thomas Gleixner , mingo@elte.hu, Xiexiuqi , Hanjun Guo , "Luck, Tony" , Linux MM , LKML On 2015/6/16 17:46, Vlastimil Babka wrote: > On 06/16/2015 10:17 AM, Xishi Qiu wrote: >> On 2015/6/16 15:53, Vlastimil Babka wrote: >> >>> On 06/04/2015 02:54 PM, Xishi Qiu wrote: >>>> >>>> I think add a new migratetype is btter and easier than a new zone, so I use >>> >>> If the mirrored memory is in a single reasonably compact (no large holes) range >>> (per NUMA node) and won't dynamically change its size, then zone might be a >>> better option. For one thing, it will still allow distinguishing movable and >>> unmovable allocations within the mirrored memory. >>> >>> We had enough fun with MIGRATE_CMA and all kinds of checks it added to allocator >>> hot paths, and even CMA is now considering moving to a separate zone. >>> >> >> Hi, how about the problem of this case: >> e.g. node 0: 0-4G(dma and dma32) >> node 1: 4G-8G(normal), 8-12G(mirror), 12-16G(normal), >> so more than one normal zone in a node? or normal zone just span the mirror zone? > > Normal zone can span the mirror zone just fine. However, it will result in zone > scanners such as compaction to skip over the mirror zone inefficiently. Hmm... > Hi Vlastimil, If there are many mirror regions in one node, then it will be many holes in the normal zone, is this fine? Thanks, Xishi Qiu > > . > -- 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