On Tue 17-07-18 13:46:43, David Rientjes wrote:

On Tue, 17 Jul 2018, Baoquan He wrote:

quoted

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.

commit a5c6d6509342785bef53bf9508e1842b303f1878
Author: David Rientjes [off-list ref]
Date:   Thu Apr 5 16:23:09 2018 -0700

    mm, page_alloc: extend kernelcore and movablecore for percent

What kind of functionality do you need to not depend on this knob?
I mean it is a gross hack and you are basically working around
fragmentation issues. ZONE_MOVABLE doesn't seem to be a long term
solution here IMHO.
-- 
Michal Hocko
SUSE Labs
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