linux-kernel - Re: [PATCH 4/6] mm, memory_hotplug: reorganize new pgdat initialization

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Message-ID: <Yg4mHzoMzJSF/Y4z@localhost.localdomain>
Date:   Thu, 17 Feb 2022 11:40:31 +0100
From:   Oscar Salvador <osalvador@...e.de>
To:     Michal Hocko <mhocko@...e.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        Alexey Makhalov <amakhalov@...are.com>,
        Dennis Zhou <dennis@...nel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Nico Pache <npache@...hat.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Rafael Aquini <raquini@...hat.com>
Subject: Re: [PATCH 4/6] mm, memory_hotplug: reorganize new pgdat
 initialization

On Thu, Jan 27, 2022 at 03:44:21PM +0100, Michal Hocko wrote:
> > I feel like we should be initializing all of this only once, just after
> > allocating the node. There should be no difference between a node we're
> > reusing and a "fresh" node. IOW, memory offlining should be resetting
> > all state accordingly when the last memory goes away.
> > 
> > But I might be wrong and this patch looks like an improvement, as you
> > say,  without functional change
> 
> Yeah, I really wanted to have this simple and straightforward. To be
> completely honest I am not even sure this is necessary. Something really
> woth looking at.

Seizing the opportunity that I had to look at this code and at x86's
numa init code again I am preparing something to further sort this out and
simplify it a bit.

So I will have something soon unless someone beats me to it first. 

-- 
Oscar Salvador
SUSE Labs