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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
