linux-kernel - Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0 offline

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Message-ID: <5688b358-36bc-ccf0-d24b-a65375a9f3c3@redhat.com>
Date:   Fri, 7 Aug 2020 08:58:09 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Michal Such?nek <msuchanek@...e.de>,
        Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Satheesh Rajendran <sathnaga@...ux.vnet.ibm.com>,
        Mel Gorman <mgorman@...e.de>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        linuxppc-dev@...ts.ozlabs.org, Christopher Lameter <cl@...ux.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v5 3/3] mm/page_alloc: Keep memoryless cpuless node 0
 offline

On 07.08.20 06:32, Andrew Morton wrote:
> On Fri, 3 Jul 2020 18:28:23 +0530 Srikar Dronamraju <srikar@...ux.vnet.ibm.com> wrote:
> 
>>> The memory hotplug changes that somehow because you can hotremove numa
>>> nodes and therefore make the nodemask sparse but that is not a common
>>> case. I am not sure what would happen if a completely new node was added
>>> and its corresponding node was already used by the renumbered one
>>> though. It would likely conflate the two I am afraid. But I am not sure
>>> this is really possible with x86 and a lack of a bug report would
>>> suggest that nobody is doing that at least.
>>>
>>
>> JFYI,
>> Satheesh copied in this mailchain had opened a bug a year on crash with vcpu
>> hotplug on memoryless node. 
>>
>> https://bugzilla.kernel.org/show_bug.cgi?id=202187
> 
> So...  do we merge this patch or not?  Seems that the overall view is
> "risky but nobody is likely to do anything better any time soon"?

I recall the issue Michal saw was "fix powerpc" vs. "break other
architectures". @Michal how should we proceed? At least x86-64 won't be
affected IIUC.

-- 
Thanks,

David / dhildenb