linux-kernel - Re: [RFC][PATCH v2 10/21] mm: build separate zonelist for PMEM and DRAM node

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Message-ID: <20190107095753.7feee5fxjja5lt75@wfg-t540p.sh.intel.com>
Date:   Mon, 7 Jan 2019 17:57:53 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Fan Du <fan.du@...el.com>, kvm@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Yao Yuan <yuan.yao@...el.com>,
        Peng Dong <dongx.peng@...el.com>,
        Huang Ying <ying.huang@...el.com>,
        Liu Jingqi <jingqi.liu@...el.com>,
        Dong Eddie <eddie.dong@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Zhang Yi <yi.z.zhang@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [RFC][PATCH v2 10/21] mm: build separate zonelist for PMEM and
 DRAM node

On Tue, Jan 01, 2019 at 02:44:41PM +0530, Aneesh Kumar K.V wrote:
>Fengguang Wu <fengguang.wu@...el.com> writes:
>
>> From: Fan Du <fan.du@...el.com>
>>
>> When allocate page, DRAM and PMEM node should better not fall back to
>> each other. This allows migration code to explicitly control which type
>> of node to allocate pages from.
>>
>> With this patch, PMEM NUMA node can only be used in 2 ways:
>> - migrate in and out
>> - numactl
>
>Can we achieve this using nodemask? That way we don't tag nodes with
>different properties such as DRAM/PMEM. We can then give the
>flexibilility to the device init code to add the new memory nodes to
>the right nodemask

Aneesh, in patch 2 we did create nodemask numa_nodes_pmem and
numa_nodes_dram. What's your supposed way of "using nodemask"?

Thanks,
Fengguang