Re: Using sched_clock for mmio-trace

> This is one of the reasons why we don't just use good old
> do_gettimeofday(), since it takes locks and can lead to lock recursion
> if parts of itself are probed.

do_gettimeofday doesn't take locks.

Only restriction is that you can't single step it with long 
pauses between instructions.

-Andi
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