linux-kernel - Re: [PATCH 4/4] mm: numa: Do not mark PTEs pte

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Message-ID: <20141002190734.GA15671@node.dhcp.inet.fi>
Date:	Thu, 2 Oct 2014 22:07:34 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Sasha Levin <sasha.levin@...cle.com>, Mel Gorman <mgorman@...e.de>,
	Dave Jones <davej@...hat.com>, Hugh Dickins <hughd@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Michel Lespinasse <walken@...gle.com>,
	Kirill A Shutemov <kirill.shutemov@...ux.intel.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/4] mm: numa: Do not mark PTEs pte_numa when splitting
 huge pages

On Thu, Oct 02, 2014 at 12:03:58PM -0700, Linus Torvalds wrote:
> On Thu, Oct 2, 2014 at 11:58 AM, Sasha Levin <sasha.levin@...cle.com> wrote:
> >
> > You've also mentioned that while I can tell you if nothing dies, I can't
> > really tell you if everything is working well. Is there a reasonable way
> > to easily say if NUMA is working properly? Even something that would just
> > tell me "your NUMA balancing seems to be sane" would be good.
> 
> So not having a NUMA machine (and not really wanting one), I can't
> really test things like the migration even *working*.

I believe Sasha uses fakenuma in his KVM for that.

-- 
 Kirill A. Shutemov
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