linux-kernel - Re: [LSF/MM TOPIC] Page Cache Flexibility for NVM

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Message-ID: <08749b6a89cf1abe75820ada3663f2a983b0bdc3.camel@wdc.com>
Date:   Thu, 21 Feb 2019 23:18:15 +0000
From:   Adam Manzanares <Adam.Manzanares@....com>
To:     "lsf-pc@...ts.linux-foundation.org" 
        <lsf-pc@...ts.linux-foundation.org>,
        "dave.hansen@...el.com" <dave.hansen@...el.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "willy@...radead.org" <willy@...radead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "yang.shi@...ux.alibaba.com" <yang.shi@...ux.alibaba.com>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "cl@...ux.com" <cl@...ux.com>,
        "jglisse@...hat.com" <jglisse@...hat.com>,
        "mhocko@...e.com" <mhocko@...e.com>, "jack@...e.cz" <jack@...e.cz>
Subject: Re: [LSF/MM TOPIC] Page Cache Flexibility for NVM

On Thu, 2019-02-21 at 15:14 -0800, Dave Hansen wrote:
> On 2/21/19 3:11 PM, Adam Manzanares wrote:
> > I am proposing that as an alternative to using NVMs as a NUMA node
> > we expose the NVM through the page cache or a viable alternative
> > and
> > have userspace applications mmap the NVM and hand out memory with
> > their favorite userspace memory allocator.
> 
> Are you proposing that the kernel manage this memory (it's managed in
> the buddy lists, for instance) or that something else manage the
> memory,
> like we do for device-dax or HMM?
> 

I am proposing we use a device-dax or HMM like model.