Re: [PATCH v2:3/3]Export cpu topology by sysfs

From: Russ Anderson <>
Date: 2006-01-10 04:41:03
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
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Received on Tue Jan 10 04:42:50 2006

This archive was generated by hypermail 2.1.8 : 2006-01-10 04:42:58 EST