Re: [PATCH v2 3/3] X86: Add a thread cpu time implementation to vDSO

From: Peter Zijlstra
Date: Fri Dec 19 2014 - 06:24:12 EST


On Thu, Dec 18, 2014 at 04:22:59PM -0800, Andy Lutomirski wrote:
> Bad news: this patch is incorrect, I think. Take a look at
> update_rq_clock -- it does fancy things involving irq time and
> paravirt steal time. So this patch could result in extremely
> non-monotonic results.

Yeah, I'm not sure how (and if) we could make all that work :/
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