On Thu, Apr 11, 2013 at 10:36:35AM +0200, Stanislaw Gruszka wrote: > > I really prefer robust kernel side accounting/instrumentation. > > We have CONFIG_IRQ_TIME_ACCOUNTING and CONFIG_VIRT_CPU_ACCOUNTING_GEN. > Perhaps we can change to use one of those options by default. I wonder > if the additional performance cost related with them is really something > that we should care about. Are there any measurement that show those > will make performance worse ?
CONFIG_IRQ_TIME_ACCOUNTING also make use of scaling. And CONFIG_VIRT_CPU_ACCOUNTING_GEN involves too much overhead on IO-bound workloads. It's mostly good for undisturbed userspace bound workloads (few IRQs, few exceptions, few syscalls). -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
