Re: do_gettimeofday vs. rdtsc in the scheduler

[Andi Kleen]

On Tue, Sep 17, 2002 at 04:46:49PM -0700, David S. Miller wrote:
>    From: Andi Kleen <[e-mail]>
>    Date: Wed, 18 Sep 2002 01:52:09 +0200
> 
>    On Tue, Sep 17, 2002 at 04:32:46PM -0700, David S. Miller wrote:
>    > I know full well it isn't currently :-)
>    
>    Sorry, it's wrong. The x86 architecture has several such registers
> 
> Not in the processor, and not architectually specified.
> 
> All of the things you list are in the scope of things outside
> the cpu.

The local APIC timer is specified in the Intel Manual volume 3 for example.
It's an optional feature (CPUID), but pretty much everyone has it.

-Andi