Checkin' idle processor

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Hi,

I'm making some changes in linux scheduler, but I need to know some
CPU idle statistics. Does kernel have some variables to save processor
statistics? I know /proc/stats have some of them but I don't wanna
calc this statistics all the time (like 'top' program does), cause
this could be a little slow for the scheduler.

So... This variables exists? Do you guys have another idea of how to do that?

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