linux-kernel - Re: [PATCH 1/1] arch/x86/mm/numa: Do not initialize nodes twice

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Date:   Mon, 21 Feb 2022 10:47:44 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Rafael Aquini <raquini@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Dennis Zhou <dennis@...nel.org>,
        Alexey Makhalov <amakhalov@...are.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] arch/x86/mm/numa: Do not initialize nodes twice

On Mon, Feb 21, 2022 at 10:20:02AM +0100, Michal Hocko wrote:
> On Fri 18-02-22 23:43:02, Oscar Salvador wrote:
> > Why setting the node online saves us then? Well, simply because
> > __try_online_node() backs off when the node is online, meaning
> > we do not end up calling register_one_node() in the first place.
> 
> This is really a mess and a house built on sand. Thanks for looking into
> it and hopefully this can get cleaned up to a saner state.

Yes, I am willing to have a deep look into that and see how we can
improve the situation.

> This sha1 is from linux-next very likely so it won't be persistent.
> Please drop it.

Yes, it is. I guess it is fine to not have a "Fixes" tag here, so I will
remove it then.

> I would stick a TODO here.
> 			/*
> 			 * Exclude this node from 
> 			 * bringup_nonboot_cpus
> 			 *  cpu_up
> 			 *    __try_online_node
> 			 *      register_one_node
> 			 * because node_subsys is not initialized yet
> 			 * TODO remove dependency on node_online()
> 			 */

Sure, will do.

Thanks!

-- 
Oscar Salvador
SUSE Labs