linux-kernel - Re: [PATCH v5 4/6] x86/mem-hotplug: Support initialize page tables in bottom-up

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Message-ID: <20130926160842.GC32391@mtj.dyndns.org>
Date:	Thu, 26 Sep 2013 12:08:42 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Zhang Yanfei <zhangyanfei.yes@...il.com>
Cc:	"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, Zhang Yanfei <zhangyanfei@...fujitsu.com>
Subject: Re: [PATCH v5 4/6] x86/mem-hotplug: Support initialize page tables
 in bottom-up

On Fri, Sep 27, 2013 at 12:03:01AM +0800, Zhang Yanfei wrote:
> Ah, I see. You are saying another issue. He is worrying that if we use
> kexec to load the kernel high, say we have 16GB, we put the kernel in
> 15.99GB (just an example), so we only have less than 100MB above the kernel.
> 
> But as I've explained to him, in almost all the cases, if we want our
> memory hotplug work, we don't do that. And yeah, assume we have this
> problem, it'd fall back to top down and that return backs to patch 2,
> we will trigger the WARN_ONCE, and the admin will know what has happened.

Alright,

 Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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