linux-kernel - Re: [PATCH] arm64, numa: Add cpu_to

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Date:   Tue, 27 Sep 2016 14:26:08 +0800
From:   Hanjun Guo <hanjun.guo@...aro.org>
To:     Robert Richter <rric@...nel.org>
CC:     David Daney <ddaney.cavm@...il.com>, linux-kernel@...r.kernel.org,
        Marc Zyngier <marc.zyngier@....com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Will Deacon <will.deacon@....com>,
        Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
        linux-arm-kernel@...ts.infradead.org,
        David Daney <david.daney@...ium.com>, xieyisheng1@...wei.com
Subject: Re: [PATCH] arm64, numa: Add cpu_to_node() implementation.

On 09/20/2016 09:21 PM, Robert Richter wrote:
> On 20.09.16 19:32:34, Hanjun Guo wrote:
>> On 09/20/2016 06:43 PM, Robert Richter wrote:
>
>>> Unfortunately either your nor my code does fix the BUG_ON() I see with
>>> the numa kernel:
>>>
>>>   kernel BUG at mm/page_alloc.c:1848!
>>>
>>> See below for the core dump. It looks like this happens due to moving
>>> a mem block where first and last page are mapped to different numa
>>> nodes, thus, triggering the BUG_ON().
>>
>> Didn't triggered it on our NUMA hardware, could you provide your
>> config then we can have a try?
>
> Config attached. Other configs with an initrd fail too.

hmm, we can't reproduce it on our hardware, do we need
to run some specific stress test on it?

Thanks
Hanjun