I went through the source code for hrtimers and understood at a decent level about how they are working. However, I have the following questions. - What is the clock source for HRTimers and what is the frequency of this clock device? - with timer subsystem CONFIG_HZ can go to a max of 1000 meaning at the maximum only 1 ms latency can be reliably established. I understand that hrtimers are not using CONFIG_HZ but i am just curious as to what their clock source is and how 1 ns precision is achieved? - I am using a RT kernel and I see that interrupt handlers are executed as threaded-irqs. Is it possible to configure the priority of the interrupt handler hrtimer_interrupt()? for a FF process, the wakeup() is called from interrupt context(called by threaded irq) which is actually having lesser priority than my higher priority process. If possible I would like to change the priority of the threaded_irq process that handles timer interrupts. I believe this way sleep() will not take longer than expected.(I am debugging issues where even my FF process with prio 110 sometimes fails to wake up back in time) Thank you in advance! Regards, Manty
