Re: [PATCH 9/9] ia64: VIRT_CPU_ACCOUNTING (accurate cpu time accounting)

From: <peterc_at_gelato.unsw.edu.au>
Date: 2007-10-17 14:36:27
>>>>> "Peter" == Peter Chubb <peterc@gelato.unsw.edu.au> writes:

>>>>> "Hidetoshi" == Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> writes:
>>> [9/9] ia64_acct_get_vtime.patch
Peter> trying to do this stuff.  Things to watch are: -- With Montvale
Peter> and later, the processor clock speed can be varied via ACPI.
Peter> Does ITC rate change?  

I've checked ... according to the latest IA-64 System Architecture,
ITC runs at constant rate even if the instruction execution rate
changes.  So you're safe.

--
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au           ERTOS within National ICT Australia


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Received on Thu Oct 18 10:00:33 2007

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