linux-kernel - Re: [PATCH v3] mm: fix panic in __alloc

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Message-ID: <2c790c6c-22e4-687f-6ecd-368683d781a3@redhat.com>
Date:   Wed, 8 Dec 2021 09:38:52 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Alexey Makhalov <amakhalov@...are.com>,
        Dennis Zhou <dennis@...nel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v3] mm: fix panic in __alloc_pages

>>
>> I think we'll soon might see setups (again, CXL is an example, but als
>> owhen providing a dynamic amount of performance differentiated memory
>> via virtio-mem) where this will most probably matter. With performance
>> differentiated memory we'll see a lot more nodes getting used in
>> general, and a lot more nodes eventually getting hotplugged.
> 
> There are certainly machines with many nodes. E.g. SLES kernels are
> build with CONFIG_NODES_SHIFT=10 which is a lot of potential nodes.
> And I have seen really large machines with many nodes but those usually
> come with a lot of memory and they do not tend to have non populated
> nodes AFAIR.

Right, and is about to change as nodes are getting used to represent
memory with differing performance characteristics/individual devices,
not the traditional "this is a socket" setup: we'll see more and more
small (virtual) machines with multiple nodes and eventually many
possible nodes.

-- 
Thanks,

David / dhildenb