linux-kernel - Re: [RFC PATCH] mm: migrate: Add new node demotion strategy

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Message-ID: <9271f9d7-e251-9ed4-2126-8debb3395891@linux.alibaba.com>
Date:   Mon, 8 Nov 2021 14:38:36 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        "Huang, Ying" <ying.huang@...el.com>
Cc:     akpm@...ux-foundation.org, dave.hansen@...ux.intel.com,
        ziy@...dia.com, osalvador@...e.de, shy828301@...il.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] mm: migrate: Add new node demotion strategy



On 2021/11/7 23:20, Dave Hansen wrote:
> On 11/7/21 1:33 AM, Baolin Wang wrote:
>> Thanks for your suggestion. After some thinking, can we change the
>> node_demotion[] structure like below? Which means one source node can be
>> demoted to mutiple target node, and we can set up the target node mask
>> according to the node distance. How do you think? Thanks.
>>
>> static nodemask_t node_demotion[MAX_NUMNODES] __read_mostly =
>>          {[0 ...  MAX_NUMNODES - 1] = NODE_MASK_NONE};
> 
> How large is that in the worst case?

For the worst case (MAX_NUMNODES=1024), the size of the node_demotion is 
131072 bytes, while the size of original data structure is 4096 bytes. 
Maybe we can allocate the node_demotion dynamically?