linux-kernel - Re: [BUG] __GFP_THISNODE is not always honored

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Message-ID: <48A9CA10.80500@linux-foundation.org>
Date:	Mon, 18 Aug 2008 14:14:24 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
CC:	Adam Litke <agl@...ibm.com>, linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	nacc <nacc@...ux.vnet.ibm.com>, apw <apw@...dowen.org>,
	agl <agl@...ux.vnet.ibm.com>
Subject: Re: [BUG] __GFP_THISNODE is not always honored


> That's bad in itself and has wider reaching consequences than hugetlb
> getting its counters wrong. I believe SLUB depends on __GFP_THISNODE
> being obeyed for example. Can you boot the machine in question with
> mminit_loglevel=4 and loglevel=8 set on the command line and send me the
> dmesg please? It should output the zonelists and I might be able to
> figure out what's going wrong. Thanks

Its SLAB depends on it and will corrupt data if the wrong node is returned.
SLAB has BUG_ONs that should trigger if anything like that occurs.


> This will mask the bug for hugetlb but I wonder if this should be a
> VM_BUG_ON(page_to_nid(page) != nid) ?

Right.
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