Re: [RFC] [Patch 7/8] statistics infrastructure - exploitation prerequisite

[Andi Kleen]

> Anrd> - do_gettimeofday
> Anrd>   potentially slow, reliable TOD clock, microsecond resolution
> 
> Slow, not necessarily safe to call in IRQ context.

It's only slow if the platform can't do better. On good hardware it is 
fast. And yes it is safe to call in IRQ context. Networking does 
that all the time.

If the hardware doesn't have a good working timer for gettimeofday 
then everything else will be also slow. 

-Andi
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