Re: [PATCH 2/2] timer: really raise softirq if there is irq_work todo

[Peter Zijlstra]

On Fri, Jan 31, 2014 at 08:48:45PM +0100, Sebastian Andrzej Siewior wrote:
> 
> How "bad" is it? Is this something generic or just not getting
> perf events fast enough out? Most users don't seem to require small
> latencies.

I have vague memories of there being an actual perf problem if there's a
hole between the NMI/IRQ triggering the irq_work and the interrupt
running the work.

I should have some notes on it somewhere and an todo entry to plug the
hole.

But note that the MCE code also uses irq_work, they really _need_ to be
fast because the system might be crumbling under their feet.
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