linux-kernel - Re: [PATCH] mm/page_alloc: Deprecate kernelcore=nn and movable

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Date:   Wed, 18 Jul 2018 07:31:00 +0800
From:   Baoquan He <bhe@...hat.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     mhocko@...nel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org, corbet@....net,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH] mm/page_alloc: Deprecate kernelcore=nn and movable_core=

On 07/17/18 at 01:46pm, David Rientjes wrote:
> On Tue, 17 Jul 2018, Baoquan He wrote:
> 
> > We can still use 'kernelcore=mirror' or 'movable_node' for the usage
> > of hotplug and movable zone. If somebody shows up with a valid usecase
> > we can reconsider.
> > 
> 
> We actively use kernelcore=n%, I had recently added support for the option 
> in the first place in 4.17.  It's certainly not deprecated.

Thanks for telling. Just for curiosity, could you tell the scenario you
are using kernelcore=n%? Since it evenly spread movable area on nodes,
we may not be able to physically hot unplug/plug RAM.

Thanks
Baoquan