linux-kernel - Re: [RFC PATCH 0/5] New fallback workflow for heterogeneous memory system

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Message-ID: <20190425063727.GJ12751@dhcp22.suse.cz>
Date:   Thu, 25 Apr 2019 08:37:27 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Fan Du <fan.du@...el.com>
Cc:     akpm@...ux-foundation.org, fengguang.wu@...el.com,
        dan.j.williams@...el.com, dave.hansen@...el.com,
        xishi.qiuxishi@...baba-inc.com, ying.huang@...el.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] New fallback workflow for heterogeneous memory
 system

On Thu 25-04-19 09:21:30, Fan Du wrote:
[...]
> However PMEM has different characteristics from DRAM,
> the more reasonable or desirable fallback style would be:
> DRAM node 0 -> DRAM node 1 -> PMEM node 2 -> PMEM node 3.
> When DRAM is exhausted, try PMEM then. 

Why and who does care? NUMA is fundamentally about memory nodes with
different access characteristics so why is PMEM any special?

-- 
Michal Hocko
SUSE Labs