[PATCH 0/2] mm: vmemmap: add vmemmap_verify check for hot-add node/memory case

[Andrew Morton]

On Mon, 8 Apr 2013 11:40:11 -0700 Yinghai Lu <yinghai at kernel.org> wrote:

> On Mon, Apr 8, 2013 at 2:56 AM, Lin Feng <linfeng at cn.fujitsu.com> wrote:
> > In hot add node(memory) case, vmemmap pages are always allocated from other
> > node,
> 
> that is broken, and should be fixed.
> vmemmap should be on local node even for hot add node.
> 

That would be nice.

I don't see much value in the added warnings, really.  Because there's
nothing the user can *do* about them, apart from a) stop using NUMA, b)
stop using memory hotplug, c) become a kernel MM developer or d) switch
to Windows.