From: Russ Anderson <rja@efs.americas.sgi.com>
Message-Id: <200601091741.k09Hf4gI477712@efs.americas.sgi.com>
Subject: Re: [PATCH v2:3/3]Export cpu topology by sysfs
To: yanmin.zhang@intel.com (Zhang, Yanmin)
Date: Mon, 9 Jan 2006 11:41:03 -0600 (CST)
Cc: ntl@pobox.com (Nathan Lynch), ymzhang@unix-os.sc.intel.com (Yanmin Zhang),
       greg@kroah.com, linux-kernel@vger.kernel.org, discuss@x86-64.org,
       linux-ia64@vger.kernel.org, suresh.b.siddha@intel.com (Siddha Suresh B),
       rajesh.shah@intel.com (Shah Rajesh),
       venkatesh.pallipadi@intel.com (Pallipadi Venkatesh)
In-Reply-To: <8126E4F969BA254AB43EA03C59F44E840469321C@pdsmsx404> from "Zhang, Yanmin" at Jan 09, 2006 02:35:36 PM
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Zhang, Yanmin wrote:
> 
> >>In practice does the division of bits between core and thread in the
> >>apic id differ between cpus in the same system?
>
> 2) On ia64, ia64 manual says that cpu physical id/core id/thread id are got by pal call. It doesn't mention how to divide apic id to get physical id/core id/thread id.

The socket_id, core_id, and thread_id are part of cpuinfo_ia64.
They are set up in arch/ia64/kernel/smpboot.c: identify_siblings()

You cannot make assumptions about "the division of bits", but must rely on
the values returned by pal.


-- 
Russ Anderson, OS RAS/Partitioning Project Lead  
SGI - Silicon Graphics Inc          rja@sgi.com
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