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Date: Wed, 17 Feb 2016 22:56:42 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Andi Kleen <andi@firstfloor.org>
cc: Stephane Eranian <eranian@google.com>, LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@kernel.org>,
        Borislav Petkov <bp@alien8.de>,
        Harish Chegondi <harish.chegondi@intel.com>,
        Kan Liang <kan.liang@intel.com>, Andi Kleen <andi.kleen@intel.com>
Subject: Re: [patch 07/11] x86/perf/uncore: Track packages not per cpu data
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On Wed, 17 Feb 2016, Andi Kleen wrote:

> Stephane Eranian <eranian@google.com> writes:
> 
> >>
> > Let's assume  you have a system with 48 cpus with HT on, then
> > you have  2 processor sockets, which is correct. But then you further
> > assume that  topology_physical_package_id() will return 0 or 1 in this case.
> > In other words, that physical id are always assigned from 0 to N in a contiguous
> > manner.
> >
> > Do we know for sure that this is always the case for all Intel systems
> > and that no
> > weird BIOS is assigning random numbers for phys_proc_id?
> 
> I don't believe that is a safe assumption.

Do you have any data to back that up or is that just "believe" ?

Thanks,

	tglx