Messages in this thread | | | Subject | Re: [PATCH v4 6/7] sched: add function nr_running_cpu to expose number of tasks running on cpu | From | Tim Chen <> | Date | Tue, 15 Jul 2014 11:40:58 -0700 |
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On Tue, 2014-07-15 at 14:07 +0200, Peter Zijlstra wrote: > 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.
Will try another version of the patch without using the idle notifier.
Tim
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