linux-kernel - Re: [PATCH] docs: reorder memory-hotplug documentation

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Message-ID: <20190521161101.GA2372@linux>
Date:   Tue, 21 May 2019 18:11:05 +0200
From:   Oscar Salvador <osalvador@...e.de>
To:     David Hildenbrand <david@...hat.com>
Cc:     Mike Rapoport <rppt@...ux.ibm.com>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] docs: reorder memory-hotplug documentation

On Tue, May 21, 2019 at 12:41:50PM +0200, David Hildenbrand wrote:
> > +Future Work
> > +===========
> > +
> > +  - allowing memory hot-add to ZONE_MOVABLE. maybe we need some switch like
> > +    sysctl or new control file.
> 
> ... that already works if I am not completely missing the point here

It does.

> > +  - support HugeTLB page migration and offlining.
> 
> ... I remember that Oscar was doing something in that area, Oscar?

Yes, in general offlinining on hugetlb pages was already working, but we did not
allow to offline 1GB-hugetlb pages on x86_64.
I removed that limitation with
("commit: 10eeadf3045c mm,memory_hotplug: unlock 1GB-hugetlb on x86_64") , so now
offlining on hugetlb pages should be fully operative.

> I'd vote for removing the future work part, this is pretty outdated.

Instead of removing it, I would rather make it consistent with the present.
E.g:

- Move page handling from memory-hotremove to offline stage
- Enable a way to allocate vmemmap pages from hot-added memory
etc.


-- 
Oscar Salvador
SUSE L3