linux-kernel - Re: [patch 07/11] x86/perf/uncore: Track packages not per cpu data

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Message-ID: <alpine.DEB.2.11.1602172255510.19512@nanos>
Date:	Wed, 17 Feb 2016 22:56:42 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Andi Kleen <andi@...stfloor.org>
cc:	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
	Harish Chegondi <harish.chegondi@...el.com>,
	Kan Liang <kan.liang@...el.com>,
	Andi Kleen <andi.kleen@...el.com>
Subject: Re: [patch 07/11] x86/perf/uncore: Track packages not per cpu data

On Wed, 17 Feb 2016, Andi Kleen wrote:

> Stephane Eranian <eranian@...gle.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