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

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Message-Id: <20200806213211.6a6a56037fe771836e5abbe9@linux-foundation.org>
Date:   Thu, 6 Aug 2020 21:32:11 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Michal Such?nek <msuchanek@...e.de>,
        David Hildenbrand <david@...hat.com>,
        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 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"?