On Tue, Jul 15, 2014 at 11:50:45AM +0200, Peter Zijlstra wrote: > So you already have an idle notifier (which is x86 only, we should fix > that I suppose), and you then double check there really isn't anything > else running.
Note that we've already done a large part of the expense of going idle by the time we call that idle notifier -- in specific, we've reprogrammed the clock to stop the tick. Its really wasteful to then generate work again, which means we have to again reprogram the clock etc.
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