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Date: Mon, 05 Jun 2006 21:04:12 +0100
From: Andy Whitcroft <apw@shadowen.org>
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To: Christoph Lameter <clameter@sgi.com>
CC: Martin Bligh <mbligh@google.com>, Arjan van de Ven <arjan@infradead.org>,
        "Martin J. Bligh" <mbligh@mbligh.org>, Andrew Morton <akpm@osdl.org>,
        linux-kernel@vger.kernel.org, ak@suse.de,
        Hugh Dickins <hugh@veritas.com>
Subject: Re: 2.6.17-rc5-mm1
References: <447DEF49.9070401@google.com>  <20060531140652.054e2e45.akpm@osdl.org> <447E093B.7020107@mbligh.org>  <20060531144310.7aa0e0ff.akpm@osdl.org> <447E104B.6040007@mbligh.org>  <447F1702.3090405@shadowen.org> <44842C01.2050604@shadowen.org>  <Pine.LNX.4.64.0606051137400.17951@schroedinger.engr.sgi.com> <1149533399.3111.120.camel@laptopd505.fenrus.org> <Pine.LNX.4.64.0606051151150.18056@schroedinger.engr.sgi.com> <44848283.3000207@google.com> <Pine.LNX.4.64.0606051216290.18264@schroedinger.engr.sgi.com> <448486FB.8060007@google.com> <Pine.LNX.4.64.0606051234440.18361@schroedinger.engr.sgi.com>
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Christoph Lameter wrote:
> On Mon, 5 Jun 2006, Martin Bligh wrote:
> 
> 
>>No, that is the config it starts with, sorry ... that was misleading.
>>It then does makeoldconfig from there:
>>
>>http://test.kernel.org/abat/34624/build/dotconfig
> 
> 
> Ok. So page migration is enabled.
> 
> 
>>>Either what we see is due to code rearrangement or there is something wrong
>>>with the fallback definitions in include/linux/swapops.h. 
>>>The swapless-pm-add-r-w-migration-entries.patch also introduces Hugh's
>>>reversal of the anon_vma list.
>>
>>OK, are those easily separable? Sounds like one good test would be to
>>force CONFIG_MIGRATION to =n, right?
> 
> 
> CONFIG_MIGRATION off will disable the page migration stuff and make swap 
> types 30 / 31 usable as before. The reversal of the order for the anon_vma 
> list will be preserved.
> 
> So yes it may lead us further. If the problem persists with 
> CONFIG_MIGRATION=n then the anon_vma reversal may be an issue.

Ok.  Will test that when I get a minute.

-apw