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

From: Andi Kleen
Date: Tue May 16 2006 - 21:27:49 EST

> 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.

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