linux-kernel - Re: [PATCH 4/6] x86/mem-hotplug: Support initialize page tables bottom up

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Message-ID: <20130924132727.GI2366@htj.dyndns.org>
Date:	Tue, 24 Sep 2013 09:27:27 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Zhang Yanfei <zhangyanfei.yes@...il.com>
Cc:	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>, lenb@...nel.org,
	Thomas Gleixner <tglx@...utronix.de>, mingo@...e.hu,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Toshi Kani <toshi.kani@...com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Thomas Renninger <trenn@...e.de>,
	Yinghai Lu <yinghai@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	isimatu.yasuaki@...fujitsu.com, izumi.taku@...fujitsu.com,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	mina86@...a86.com, gong.chen@...ux.intel.com,
	vasilis.liaskovitis@...fitbricks.com, lwoodman@...hat.com,
	Rik van Riel <riel@...hat.com>, jweiner@...hat.com,
	prarit@...hat.com, "x86@...nel.org" <x86@...nel.org>,
	linux-doc@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>, linux-acpi@...r.kernel.org,
	imtangchen@...il.com
Subject: Re: [PATCH 4/6] x86/mem-hotplug: Support initialize page tables
 bottom up

On Tue, Sep 24, 2013 at 09:23:48PM +0800, Zhang Yanfei wrote:
> > Hmm... so, this is kinda weird.  We're doing it in two chunks and
> > mapping memory between ISA_END_ADDRESS and kernel_end right on top of
> > ISA_END_ADDRESS?  Can't you give enough information to the mapping
> > function so that it can map everything on top of kernel_end in single
> > go?
> 
> You mean we should call memory_map_bottom_up like this:
> 
> memory_map_bottom_up(ISA_END_ADDRESS, end)
> 
> right?

But that wouldn't be ideal as we want the page tables above kernel
image and the above would allocate it above ISA_END_ADDRESS, right?
Maybe memory_map_bottom_up() should take extra parameters for where to
allocate page tables at separately from the mapping range and treat it
specially?  Would that make the function a lot more complex?

Thanks.

-- 
tejun
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