Messages in this thread | | | Subject | Re: Using sched_clock for mmio-trace | From | Thomas Gleixner <> | Date | Sat, 17 Feb 2007 16:19:58 +0100 |
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On Sat, 2007-02-17 at 15:56 +0100, Andi Kleen wrote: > > 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.
Err, it uses read side of xtime lock, so you can not call it from a place which write locks xtime lock.
tglx
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