linux-kernel - Re: [PATCH -V11 2/9] mm/migrate: update node demotion order on hotplug events

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Message-ID: <87k0d4ge8b.fsf@yhuang6-desk2.ccr.corp.intel.com>
Date:   Wed, 09 Mar 2022 08:29:40 +0800
From:   "Huang, Ying" <ying.huang@...el.com>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Abhishek Goel <huntbag@...ux.vnet.ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Zi Yan <ziy@...dia.com>,
        David Hildenbrand <david@...hat.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -V11 2/9] mm/migrate: update node demotion order on
 hotplug events

Oscar Salvador <osalvador@...e.de> writes:

> On Tue, Mar 08, 2022 at 09:07:20AM -0800, Dave Hansen wrote:
>> On 3/8/22 02:27, Oscar Salvador wrote:
>> > @@ -2043,7 +2044,12 @@ static void __init init_cpu_node_state(void)
>> >  static int vmstat_cpu_online(unsigned int cpu)
>> >  {
>> >  	refresh_zone_stat_thresholds();
>> > -	node_set_state(cpu_to_node(cpu), N_CPU);
>> > +
>> > +	if (!node_state(cpu_to_node(cpu), N_CPU)) {
>> > +		node_set_state(cpu_to_node(cpu), N_CPU);
>> > +		set_migration_target_nodes();
>> > +	}
>> > +
>> >  	return 0;
>> >  }
>> > 
>> > @@ -2066,6 +2072,8 @@ static int vmstat_cpu_dead(unsigned int cpu)
>> >  		return 0;
>> > 
>> >  	node_clear_state(node, N_CPU);
>> > +	set_migration_target_nodes();
>> > +
>> >  	return 0;
>> >  }
>> 
>> Yeah, those callbacks do look like they're reinventing the wheel.  This
>> is a much more direct way of doing it.
>
> Then let me play a bit more with it and I can cook a patch unless
> someone feels strong against it.

This looks good to me, Thanks!

Best Regards,
Huang, Ying