linux-kernel - Re: [RESEND PATCH] mm: clear N_HIGH_MEMORY map before se set it again -v2

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Message-ID: <alpine.DEB.1.10.0906041309230.8080@gentwo.org>
Date:	Thu, 4 Jun 2009 13:11:53 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Yinghai Lu <yinghai@...nel.org>
cc:	Andrew Morton <akpm@...ux-foundation.org>, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, mel@....ul.ie,
	suresh.b.siddha@...el.com, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, rusty@...tcorp.com.au, steiner@....com,
	rientjes@...gle.com
Subject: Re: [RESEND PATCH] mm: clear N_HIGH_MEMORY map before se set it
 again -v2

On Thu, 4 Jun 2009, Yinghai Lu wrote:

> in case some system strange SRAT table. some kind of small range form some node
> or with mem= boot option etc. that node will not be onlined.
> In the early checking, the bit in node_states[N_HIGH_MEMORY] for the
> node is set even that node has less RAM like 1M.

Maybe we can replace that with:

SRAT tables may contains nodes of very small size. The arch code may
decide to not activate such a node. However, currently the early boot code
sets N_HIGH_MEMORY for such nodes. These nodes therefore seem to be active
although these nodes have no present pages.

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