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Date: Thu, 02 Oct 2014 15:12:55 -0400
From: Sasha Levin <sasha.levin@oracle.com>
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To: "Kirill A. Shutemov" <kirill@shutemov.name>,
        Linus Torvalds <torvalds@linux-foundation.org>
CC: Mel Gorman <mgorman@suse.de>, Dave Jones <davej@redhat.com>,
        Hugh Dickins <hughd@google.com>, Al Viro <viro@zeniv.linux.org.uk>,
        Rik van Riel <riel@redhat.com>, Ingo Molnar <mingo@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>,
        Michel Lespinasse <walken@google.com>,
        Kirill A Shutemov <kirill.shutemov@linux.intel.com>,
        Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/4] mm: numa: Do not mark PTEs pte_numa when splitting
 huge pages
References: <1412256558-9995-1-git-send-email-mgorman@suse.de> <1412256558-9995-5-git-send-email-mgorman@suse.de> <CA+55aFzJtoEXEzoyYQ=j+AMxyZNL3Gr3bhXPr3twyuGzvES1PA@mail.gmail.com> <542DA038.9000908@oracle.com> <CA+55aFwybOYtuOn43idiikVDPfBO7pWb4vLjhcM0dYUxTx7odA@mail.gmail.com> <20141002190734.GA15671@node.dhcp.inet.fi>
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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@oracle.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