linux-kernel - Re: [PATCH -V10 RESEND 0/6] NUMA balancing: optimize memory placement for memory tiering system

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Message-ID: <Yd79b6PptQMNzDRw@hirez.programming.kicks-ass.net>
Date:   Wed, 12 Jan 2022 17:10:23 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Huang Ying <ying.huang@...el.com>
Cc:     Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Feng Tang <feng.tang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Rik van Riel <riel@...riel.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Yang Shi <shy828301@...il.com>, Zi Yan <ziy@...dia.com>,
        Wei Xu <weixugc@...gle.com>, osalvador <osalvador@...e.de>,
        Shakeel Butt <shakeelb@...gle.com>,
        Hasan Al Maruf <hasanalmaruf@...com>
Subject: Re: [PATCH -V10 RESEND 0/6] NUMA balancing: optimize memory
 placement for memory tiering system

On Tue, Dec 07, 2021 at 10:27:51AM +0800, Huang Ying wrote:
> After commit c221c0b0308f ("device-dax: "Hotplug" persistent memory
> for use like normal RAM"), the PMEM could be used as the
> cost-effective volatile memory in separate NUMA nodes.  In a typical
> memory tiering system, there are CPUs, DRAM and PMEM in each physical
> NUMA node.  The CPUs and the DRAM will be put in one logical node,
> while the PMEM will be put in another (faked) logical node.

So what does a system like that actually look like, SLIT table wise, and
how does that affect init_numa_topology_type() ?