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SubjectRe: [PATCH] make poll_idle behave more like the other idle methods

* Joe Korty <joe.korty@ccur.com> wrote:

> Make poll_idle() behave more like the other idle methods.
>
> Currently, poll_idle() returns immediately. The other
> idle methods all wait indefinately for some condition
> to come true before returning. poll_idle should emulate
> these other methods and also wait for a return condition,
> in this case, for need_resched() to become 'true'.
>
> Without this delay the idle loop spends all of its time
> in the outer loop that calls poll_idle. This outer loop,
> these days, does real work, some of it under rcu locks.
> That work should only be done when idle is entered and
> when idle exits, not continuously while idle is spinning.

i'm wondering, what's the motivation, have you actually seen
anything bad/undesired happen due to that?

Ingo


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