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Date: Wed, 27 Jan 2010 01:00:29 +0100
From: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH 00 of 31] Transparent Hugepage support #7
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 <20100126175532.GA3359@redhat.com>
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: linux-mm@kvack.org, Marcelo Tosatti <mtosatti@redhat.com>, Adam Litke <agl@us.ibm.com>, Avi Kivity <avi@redhat.com>, Izik Eidus <ieidus@redhat.com>, Hugh Dickins <hugh.dickins@tiscali.co.uk>, Nick Piggin <npiggin@suse.de>, Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>, Andi Kleen <andi@firstfloor.org>, Dave Hansen <dave@linux.vnet.ibm.com>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Ingo Molnar <mingo@elte.hu>, Mike Travis <travis@sgi.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Christoph Lameter <cl@linux-foundation.org>, Chris Wright <chrisw@sous-sol.org>, Andrew Morton <akpm@linux-foundation.org>, bpicco@redhat.com, Christoph Hellwig <chellwig@redhat.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
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Hi Michael,

Please try again booting with transparent_hugepage=5 that will disable
khugepaged, it'll still provide a benefit to you, it should avoid the
problem, and in meantime, I'll send you a debug patch to see exactly
what's inside that pte that isn't mapping a page proper... likely some
device driver that I'm not using that is doing something, expected fix
is on the one liner size to the khugepaged last patch. Nothing
worrysome... but I need more debug data to be sure what it is and to
do a proper fix.

Thanks a lot!
Andrea

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