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

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Message-ID: <542DA3B7.8090901@oracle.com>
Date:	Thu, 02 Oct 2014 15:12:55 -0400
From:	Sasha Levin <sasha.levin@...cle.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>,
	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	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 10/02/2014 03:07 PM, Kirill A. Shutemov wrote:
> 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.

That's true. You can impose arbitrary configurations on your kernel even without your
hardware telling you to...


Thanks,
Sasha
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