linux-kernel - Re: [v2 PATCH 5/9] mm: vmscan: demote anon DRAM pages to PMEM node

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Message-ID: <42f2a561-f675-14d7-8d4f-87acfe0a18e9@intel.com>
Date:   Mon, 15 Apr 2019 15:14:46 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Yang Shi <yang.shi@...ux.alibaba.com>, mhocko@...e.com,
        mgorman@...hsingularity.net, riel@...riel.com, hannes@...xchg.org,
        akpm@...ux-foundation.org, keith.busch@...el.com,
        dan.j.williams@...el.com, fengguang.wu@...el.com, fan.du@...el.com,
        ying.huang@...el.com, ziy@...dia.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH 5/9] mm: vmscan: demote anon DRAM pages to PMEM node

On 4/15/19 3:10 PM, Yang Shi wrote:
>> Also, I don't see anything in the code tying this to strictly demote
>> from DRAM to PMEM.  Is that the end effect, or is it really implemented
>> that way and I missed it?
> 
> No, not restrict to PMEM. It just tries to demote from "preferred node"
> (or called compute node) to a memory-only node. In the hardware with
> PMEM, PMEM would be the memory-only node.

If that's the case, your patch subject is pretty criminal. :)