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Date:	Tue, 16 Sep 2014 12:07:25 +0200
From:	Heiko Carstens <>
To:	Dave Hansen <>
Cc:	Peter Zijlstra <>,,,,,
	Alex Chiang <>, Borislav Petkov <>,
	Rusty Russell <>,
	Mike Travis <>,
	Greg Kroah-Hartman <>
Subject: Re: [PATCH] x86: Consider multiple nodes in a single socket to be

On Tue, Sep 16, 2014 at 01:17:44AM -0700, Dave Hansen wrote:
> >> The sysfs effects here cause an issue with the hwloc tool where
> >> it gets confused and thinks there are more sockets than are
> >> physically present.
> > 
> > Meh, so then we need another mask.
> s390 has this concept of a "book" although it's not obvious at all where
> this fits in to the hierarchy to me.  The help text and comments are
> pretty funny:
> 	Book scheduler support improves the CPU scheduler's decision
> 	making when dealing with machines that have several books.
> Wow, really?  Book scheduling helps with books?  I would have never
> guessed.

I'm glad the help text did enlighten you.

>  Wish I knew what a book was. :)  Google helped a bit:
> but it's still not clear.  I think a book is below a node?
> 	SMT <= LLC <= MC <= BOOK <= NODE

This one is correct. s390 does not have NUMA support. So we have one
node with multiple books.

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