linux-kernel - Re: [PATCH 5/5] mm/hotplug: export try_online

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Message-ID: <20190617071605.GD30420@dhcp22.suse.cz>
Date:   Mon, 17 Jun 2019 09:16:05 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Alastair D'Silva <alastair@...ilva.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Arun KS <arunks@...eaurora.org>,
        Mukesh Ojha <mojha@...eaurora.org>,
        Logan Gunthorpe <logang@...tatee.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Ingo Molnar <mingo@...nel.org>, linux-mm@...ck.org,
        Qian Cai <cai@....pw>, Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Baoquan He <bhe@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Oscar Salvador <osalvador@...e.com>,
        Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
        Jerome Glisse <jglisse@...hat.com>
Subject: Re: [PATCH 5/5] mm/hotplug: export try_online_node

[Cc Jerome - email thread starts
http://lkml.kernel.org/r/20190617043635.13201-1-alastair@au1.ibm.com]

On Mon 17-06-19 17:05:30,  Alastair D'Silva  wrote:
> On Mon, 2019-06-17 at 08:59 +0200, Peter Zijlstra wrote:
> > On Mon, Jun 17, 2019 at 02:36:31PM +1000, Alastair D'Silva wrote:
> > > From: Alastair D'Silva <alastair@...ilva.org>
> > > 
> > > If an external driver module supplies physical memory and needs to
> > > expose
> > 
> > Why would you ever want to allow a module to do such a thing?
> > 
> 
> I'm working on a driver for Storage Class Memory, connected via an
> OpenCAPI link.
> 
> The memory is only usable once the card says it's OK to access it.

Isn't this what HMM is aiming for? Could you give a more precise
description of what the actual storage is, how it is going to be used
etc... In other words describe the usecase?

-- 
Michal Hocko
SUSE Labs