linux-kernel - Re: [PATCH v4 4/5] mm: make processing of movable

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Date:   Wed, 26 Oct 2016 12:03:44 -0500
From:   Reza Arbab <arbab@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Balbir Singh <bsingharora@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Bharata B Rao <bharata@...ux.vnet.ibm.com>,
        Nathan Fontenot <nfont@...ux.vnet.ibm.com>,
        Stewart Smith <stewart@...ux.vnet.ibm.com>,
        Alistair Popple <apopple@....ibm.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Tang Chen <tangchen@...fujitsu.com>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        devicetree@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v4 4/5] mm: make processing of movable_node arch-specific

On Wed, Oct 26, 2016 at 09:52:53PM +1100, Michael Ellerman wrote:
>> As far as I know, power has nothing like the SRAT that tells us, at
>> boot, which memory is hotpluggable.
>
>On pseries we have the ibm,dynamic-memory device tree property, which
>can contain ranges of memory that are not yet "assigned to the
>partition" - ie. can be hotplugged later.
>
>So in general that statement is not true.
>
>But I think you're focused on bare-metal, in which case you might be
>right. But that doesn't mean we couldn't have a similar property, if
>skiboot/hostboot knew what the ranges of memory were going to be.

Yes, sorry, I should have qualified that statement to say I wasn't 
talking about pseries.

I can amend this set to actually implement movable_node on power too, 
but we'd have to settle on a name for the dt property. Is 
"linux,movable-node" too on the nose?

-- 
Reza Arbab