From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Subject: Re: [RFC][PATCH v2 10/21] mm: build separate zonelist for PMEM and DRAM node
Date: Tue, 01 Jan 2019 14:44:41 +0530
Message-ID: <87sgyc7n9a.fsf@linux.ibm.com>
References: <20181226131446.330864849@intel.com> <20181226133351.644607371@intel.com>
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Cc: Linux Memory Management List <linux-mm@kvack.org>,
        Fan Du <fan.du@intel.com>,
        Fengguang Wu <fengguang.wu@intel.com>, kvm@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        Yao Yuan <yuan.yao@intel.com>,
        Peng Dong <dongx.peng@intel.com>,
        Huang Ying <ying.huang@intel.com>,
        Liu Jingqi <jingqi.liu@intel.com>,
        Dong Eddie <eddie.dong@intel.com>,
        Dave Hansen <dave.hansen@intel.com>,
        Zhang Yi <yi.z.zhang@linux.intel.com>,
        Dan Williams <dan.j.williams@intel.com>
To: Fengguang Wu <fengguang.wu@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>
Return-path: <linux-kernel-owner@vger.kernel.org>
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Fengguang Wu <fengguang.wu@intel.com> writes:

> From: Fan Du <fan.du@intel.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