linux-kernel - Re: [RFC PATCH 2/3] mm/memory_hotplug: Create __shrink_pages and move it to offline

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Message-ID: <20180809205050.GA17222@techadventures.net>
Date:   Thu, 9 Aug 2018 22:50:50 +0200
From:   Oscar Salvador <osalvador@...hadventures.net>
To:     Jerome Glisse <jglisse@...hat.com>
Cc:     Michal Hocko <mhocko@...nel.org>, akpm@...ux-foundation.org,
        dan.j.williams@...el.com, pasha.tatashin@...cle.com,
        david@...hat.com, yasu.isimatu@...il.com, logang@...tatee.com,
        dave.jiang@...el.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Oscar Salvador <osalvador@...e.de>
Subject: Re: [RFC PATCH 2/3] mm/memory_hotplug: Create __shrink_pages and
 move it to offline_pages

On Thu, Aug 09, 2018 at 12:58:21PM -0400, Jerome Glisse wrote:
> > I would really prefer to be explicit about these requirements rather
> > than having subtle side effects quite deep in the memory hotplug code
> > and checks for zone device sprinkled at places for special handling.
> 
> I agree, i never thought about that before. Looking at existing resource
> management i think the simplest solution would be to use a refcount on the
> resources instead of the IORESOURCE_BUSY flags.
> 
> So when you release resource as part of hotremove you would only dec the
> refcount and a resource is not busy only when refcount is zero.
> 
> Just the idea i had in mind. Right now i am working on other thing, Oscar
> is this something you would like to work on ? Feel free to come up with
> something better than my first idea :)

Hi Jerome,

Definetly it would be something I am interested to work on.
Let me think a bit about this and see if I can come up with something.

Thanks
-- 
Oscar Salvador
SUSE L3