linux-kernel - Re: + memory-hotplug-alloc-page-from-other-node-in-memory-online.patch added to -mm tree

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Message-ID: <20090630004735.GA21254@sli10-desk.sh.intel.com>
Date:	Tue, 30 Jun 2009 08:47:35 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"mel@....ul.ie" <mel@....ul.ie>,
	"Zhao, Yakui" <yakui.zhao@...el.com>
Subject: Re: +
	memory-hotplug-alloc-page-from-other-node-in-memory-online.patch
	added to -mm tree

On Tue, Jun 30, 2009 at 06:07:16AM +0800, Christoph Lameter wrote:
> On Mon, 29 Jun 2009, akpm@...ux-foundation.org wrote:
> 
> > To initialize hotadded node, some pages are allocated.  At that time, the
> > node hasn't memory, this makes the allocation always fail.  In such case,
> > let's allocate pages from other nodes.
> 
> Thats bad. Could you populate the buddy list with some large pages from
> the  beginning of the node instead of doing this special casing? The
> vmemmap and other stuff really should come from the node that is added.
> Otherwise off node memory accesses will occur constantly for processors on
> that node.
Ok, this is preferred. But the node hasn't any memory present at that time,
let me check how could we do it.

Thanks,
Shaohua
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