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

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Date:   Thu, 6 Oct 2016 11:15:22 +0200
From:   Robert Richter <rric@...nel.org>
To:     Hanjun Guo <hanjun.guo@...aro.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 27.09.16 14:26:08, Hanjun Guo wrote:
> 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?

No, it depends on the efi memory zones marked reserved. See my other
thread on this where I have attached mem ranges from the log. I have a
fix available already.

Thanks,

-Robert