Re: Warning after memory hotplug then online.

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On Mon, 24 Sep 2018 14:39:17 +0200
Oscar Salvador <osalvador@xxxxxxxxxxxxxxxxxx> wrote:

> On Mon, Sep 24, 2018 at 01:07:01PM +0100, Jonathan Cameron wrote:
> > 
> > Hi All,
> > 
> > This is with some additional patches on top of the mm tree to support
> > arm64 memory hot plug, but this particular issue doesn't (at first glance)
> > seem to be connected to that.  It's not a recent issue as IIRC I
> > disabled Kconfig for cgroups when starting to work on this some time ago
> > as a quick and dirty work around for this.  
> 
> Hi Jonathan,
> 
> would you mind to describe the steps you are taking?
> You are adding the memory, and then you online it?
> 

Yes. Exactly that. 

I've hacked the efi memory map to give me 8GB of memory to play with.
I then use /sys/devices/system/memory/probe to hot add a section and
online via /sys/devices/nodes/devices/node3/memory80/online

Everything 'works', but this warning occurs.

This is with a forward ported version of the first
lot of hotplug patches that Andrea Reale, Maciej Bielski and Scott Branden 
wrote... (with NUMA and ACPI support added).

https://lkml.org/lkml/2017/4/11/536

Jonathan




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