linux-kernel - Re: [PATCH] x86: numa: drop ZONE

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Date:	Sun, 8 Jun 2014 18:29:11 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Luiz Capitulino <lcapitulino@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Linux MM <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] x86: numa: drop ZONE_ALIGN

On Sun, Jun 8, 2014 at 3:14 PM, Luiz Capitulino <lcapitulino@...hat.com> wrote:
> In short, I believe this is just dead code for the upstream kernel but this
> causes a bug for 2.6.32 based kernels.
>
> The setup_node_data() function is used to initialize NODE_DATA() for a node.
> It gets a node id and a memory range. The start address for the memory range
> is rounded up to ZONE_ALIGN and then it's used to initialize
> NODE_DATA(nid)->node_start_pfn.
> The 2.6.32 kernel did use the rounded up range start to register a node's
> memory range with the bootmem interface by calling init_bootmem_node().
> A few steps later during bootmem initialization, the 2.6.32 kernel calls
> free_bootmem_with_active_regions() to initialize the bootmem bitmap. This
> function goes through all memory ranges read from the SRAT table and try
> to mark them as usable for bootmem usage. However, before marking a range
> as usable, mark_bootmem_node() asserts if the memory range start address
> (as read from the SRAT table) is less than the value registered with
> init_bootmem_node(). The assertion will trigger whenever the memory range
> start address is rounded up, as it will always be greater than what is
> reported in the SRAT table. This is true when the 2.6.32 kernel runs as a
> HyperV guest on Windows Server 2012. Dropping ZONE_ALIGN solves the
> problem there.

What is e820 memmap and srat from HyperV guest?

Can you post bootlog first 200 lines?

Thanks

Yinghai
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