linux-kernel - Re: [PATCH v2 0/2] xen: vnuma introduction for pv guest

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Message-ID: <20131119153837.GA5966@phenom.dumpdata.com>
Date:	Tue, 19 Nov 2013 10:38:37 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Elena Ufimtseva <ufimtseva@...il.com>
Cc:	xen-devel@...ts.xenproject.org, boris.ostrovsky@...cle.com,
	david.vrabel@...rix.com, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, x86@...nel.org, akpm@...ux-foundation.org,
	tangchen@...fujitsu.com, wency@...fujitsu.com,
	ian.campbell@...rix.com, stefano.stabellini@...citrix.com,
	mukesh.rathor@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] xen: vnuma introduction for pv guest

On Mon, Nov 18, 2013 at 03:25:48PM -0500, Elena Ufimtseva wrote:
> Xen vnuma introduction.
> 
> The patchset introduces vnuma to paravirtualized Xen guests
> runnning as domU.
> Xen subop hypercall is used to retreive vnuma topology information.
> Bases on the retreived topology from Xen, NUMA number of nodes,
> memory ranges, distance table and cpumask is being set.
> If initialization is incorrect, sets 'dummy' node and unsets
> nodemask.
> vNUMA topology is constructed by Xen toolstack. Xen patchset is
> available at https://git.gitorious.org/xenvnuma/xenvnuma.git:v3.

Yeey!

One question - I know you had questions about the
PROT_GLOBAL | ~PAGE_PRESENT being set on PTEs that are going to
be harvested for AutoNUMA balancing. 

And that the hypercall to set such PTE entry disallows the
PROT_GLOBAL (it stripts it off)? That means that when the
Linux page system kicks in (as it has ~PAGE_PRESENT) the
Linux pagehandler won't see the PROT_GLOBAL (as it has
been filtered out). Which means that the AutoNUMA code won't
kick in.

(see http://article.gmane.org/gmane.comp.emulators.xen.devel/174317)

Was that problem ever answered?
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