linux-kernel - Re: [PATCH] mempolicy: check home

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Date: Mon, 29 Jan 2024 14:15:00 +0800
From: ustc <luochunsheng@...c.edu>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mempolicy: check home_node is in the nodes of policy

For example,  In a system with NUMA nodes 0,1,2,3, i mbind process to 
node 0-2 and set home_node to node 3, it will not be allocated from node 
3, then from node closer to node 3. But i think home_node should be set 
directly from node 0-2, which makes more sense. So i think it needs to 
return failure to prompt user.

On 2024/1/28 16:29, Andrew Morton wrote:
> On Fri, 26 Jan 2024 08:22:40 -0500 Chunsheng Luo <luochunsheng@...c.edu> wrote:
>
>> set_mempolicy_home_node should be used after setting the memory
>> policy. If the home_node isn't in the nodes of policy, we should
>> return failure to avoid misunderstanding.
> Thanks.  Under what circumstances does userspace trigger this issue?
>