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Date: Tue, 16 Sep 2014 12:07:25 +0200 From: Heiko Carstens <heiko.carstens@...ibm.com> To: Dave Hansen <dave@...1.net> Cc: Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org, mingo@...nel.org, hpa@...ux.intel.com, ak@...ux.intel.com, Alex Chiang <achiang@...com>, Borislav Petkov <bp@...e.de>, Rusty Russell <rusty@...tcorp.com.au>, Mike Travis <travis@....com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: Re: [PATCH] x86: Consider multiple nodes in a single socket to be "sane" 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: > http://sysmagazine.com/posts/150430/ > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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