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* Andrew Morton <akpm@osdl.org> wrote: > > The way to solve this was to set > > idle=poll. The original patch I sent was to allow the user to change to > > idle=poll dynamically. This way they could switch to the poll_idle and > > run there tests (requiring tsc not to drift) and then switch back to the > > default idle to save on electricity. > > Use gettimeofday()? > > If it's just for some sort of instrumentation, run NR_CPUS instances > of a niced-down busyloop, pin each one to a different CPU? That way > the idle function doesn't get called at all.. idle=poll is also frequently done for performance reasons [it reduces idle wakeup latency by 10 usecs] - while it could be turned off if the system has been idle for some time. E.g. cpufreqd could sample idle time and turn on/off idle=poll. High-performance setups could enable it all the time. as long as it can be done with zero-cost, i dont see why Steven's patch wouldnt be a plus for us. It's a performance thing, and having runtime switches for seemless performance features cannot be bad. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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