From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [PATCH 14/21] x86, acpi, numa: Reserve hotpluggable memory at early time. Date: Fri, 26 Jul 2013 06:26:09 -0400 Message-ID: <20130726102609.GB30786@mtj.dyndns.org> References: <1374220774-29974-1-git-send-email-tangchen@cn.fujitsu.com> <1374220774-29974-15-git-send-email-tangchen@cn.fujitsu.com> <20130723205557.GS21100@mtj.dyndns.org> <20130723213212.GA21100@mtj.dyndns.org> <51F089C1.4010402@cn.fujitsu.com> <20130725151719.GE26107@mtj.dyndns.org> <51F1F0E0.7040800@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <51F1F0E0.7040800@cn.fujitsu.com> Sender: linux-doc-owner@vger.kernel.org To: Tang Chen Cc: tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com, akpm@linux-foundation.org, trenn@suse.de, yinghai@kernel.org, jiang.liu@huawei.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, izumi.taku@jp.fujitsu.com, mgorman@suse.de, minchan@kernel.org, mina86@mina86.com, gong.chen@linux.intel.com, vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com, riel@redhat.com, jweiner@redhat.com, prarit@redhat.com, zhangyanfei@cn.fujitsu.com, yanghy@cn.fujitsu.com, x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-acpi@vger.kernel.org List-Id: linux-acpi@vger.kernel.org On Fri, Jul 26, 2013 at 11:45:36AM +0800, Tang Chen wrote: > I just don't want to any new variables to store the hotpluggable regions. > But without a new shared variable, it seems difficult to achieve the goal > you said below. Why can't it be done with the .flags field that was added anyway? > So how about this. > 1. Introduce a new global list used to store hotpluggable regions. > 2. On acpi side, find and fulfill the list. > 3. On memblock side, make the default allocation function stay away from > these regions. I was thinking more along the line of 1. Mark hotpluggable regions with a flag in memblock. 2. On ACPI side, find and mark hotpluggable regions. 3. Make memblock avoid giving out hotpluggable regions for normal allocations. Thanks. -- tejun