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List:       linux-kernel
Subject:    Re: [RFC] (How to) Let idle CPUs sleep
From:       Tony Lindgren <tony () atomide ! com>
Date:       2005-05-12 18:16:45
Message-ID: 20050512181644.GD15812 () atomide ! com
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* Jesse Barnes <jbarnes@virtuousgeek.org> [050512 11:01]:
> Srivatsa Vaddagiri wrote:
> 
> >Even if we were to go for this tickless design, the fundamental question
> >remains: who wakes up the (sleeping) idle CPU upon a imbalance? Does some 
> >other
> >(busy) CPU wake it up (which makes the implementation complex) or the idle 
> >CPU checks imbalance itself at periodic intervals (which restricts the 
> >amount of
> >time a idle CPU may sleep).
> > 
> >
> Waking it up at fork or exec time might be doable, and having a busy CPU 
> wake up other CPUs wouldn't add too much complexity, would it?

At least then it would be event driven rather than polling approach.

Tony
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