linux-kernel - Re: [RFC PATCH v2 3/5] padata: dispatch works on different nodes

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Date: Mon, 18 Dec 2023 14:46:15 +0800
From: Gang Li <gang.li@...ux.dev>
To: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 Muchun Song <muchun.song@...ux.dev>, Gang Li <gang.li@...ux.dev>,
 Mike Kravetz <mike.kravetz@...cle.com>, David Rientjes
 <rientjes@...gle.com>, David Hildenbrand <david@...hat.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH v2 3/5] padata: dispatch works on different nodes

On 2023/12/13 07:40, Tim Chen wrote:
> 
>>   
>>   	list_for_each_entry(pw, &works, pw_list)
>> -		queue_work(system_unbound_wq, &pw->pw_work);
>> +		if (job->numa_aware)
>> +			queue_work_node((++nid % num_node_state(N_MEMORY)),
> 
> The nid may fall on a NUMA node with only memory but no CPU.  In that case you
> may still put the work on the unbound queue. You could end up on one CPU node for work
> from all memory nodes without CPU. Is this what you want?  Or you would
> like to spread them between CPU nodes?
> 
> Tim

Hi, thank you for your reminder. My intention was to fully utilize all
memory bandwidth.

For memory nodes without CPUs, I also hope to be able to spread them on
different CPUs.