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

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Message-ID: <48A9CBB3.6030700@linux-foundation.org>
Date:	Mon, 18 Aug 2008 14:21:23 -0500
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Adam Litke <agl@...ibm.com>
CC:	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>, mel@....ul.ie,
	apw <apw@...dowen.org>, agl <agl@...ux.vnet.ibm.com>
Subject: Re: [BUG] __GFP_THISNODE is not always honored

Adam Litke wrote:
>
> So far my debugging has led me to get_page_from_freelist() inside the
> for_each_zone_zonelist() loop.  When buffered_rmqueue() returns a page I
> compare the value of page_to_nid(page), zone->node and the node that the
> hugetlb code requested with __GFP_THISNODE.  These all match -- except when the
> problem triggers.  In that case, zone->node matches the node we asked for but
> page_to_nid() does not.

Uhhh.. A page that was just taken off the freelist? So we may have freed or
coalesced a page to the wrong zone? Looks like there is something more
fundamental that broke here.
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