On Thu, May 21, 2015 at 10:56:32PM +0800, Huang Rui wrote: > Looks like good use case. Boris, could we try to implement it?
Andy had some suggestions on how to do it here: https://lkml.kernel.org/r/555d3629.8080...@kernel.org which should be doable. Also, you'd probably need to set ECX[0]=0b too, so that MWAITX doesn't get woken up by interrupts while MWAIT-ing with interrupts disabled. I.e., this sequence: cli rdtsc shove the computed timeout into ebx mov $2,%ecx # this enables the timer and disables IRQs while MWAITing mwaitx sti The NMI argument is a problem though - if and NMI gets you out of MWAITX, a simple perf tool workload would kill all MWAITX executions. Which is bad. :-\ -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- -- 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/
