linux-kernel - Re: [PATCH v5 00/10] mm: Sub-section memory hotplug support

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Date:   Mon, 25 Mar 2019 10:28:00 -0400
From:   Jeff Moyer <jmoyer@...hat.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jérôme Glisse <jglisse@...hat.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Toshi Kani <toshi.kani@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        stable <stable@...r.kernel.org>, Linux MM <linux-mm@...ck.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 00/10] mm: Sub-section memory hotplug support

Michal Hocko <mhocko@...nel.org> writes:

>> > and I would like to know that you are
>> > not just shifting the problem to a smaller unit and a new/creative HW
>> > will force us to go even more complicated.
>> 
>> HW will not do this to us. It's software that has the problem.
>> Namespace creation is unnecessarily constrained to 128MB alignment.
>
> And why is that a problem? A lack of documentation that this is a
> requirement? Something will not work with a larger alignment? Someting
> else?

See this email for one user-visible problem:
  https://lore.kernel.org/lkml/x49imxbx22d.fsf@segfault.boston.devel.redhat.com/

Cheers,
Jeff