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

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Message-Id: <20130408135553.2f60518d923b6920bdf1931f@linux-foundation.org>
Date:	Mon, 8 Apr 2013 13:55:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Lin Feng <linfeng@...fujitsu.com>,
	Christoph Lameter <cl@...ux.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Catalin Marinas <catalin.marinas@....com>, will.deacon@....com,
	Arnd Bergmann <arnd@...db.de>, tony@...mide.com,
	Ben Hutchings <ben@...adent.org.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Linux MM <linux-mm@...ck.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Subject: Re: [PATCH 0/2] mm: vmemmap: add vmemmap_verify check for hot-add
 node/memory case

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

> On Mon, Apr 8, 2013 at 2:56 AM, Lin Feng <linfeng@...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.

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