Re: [RFC patch 1/2] sched: dynamically adapt granularity with nr_running

Mike Galbraith
2010-09-13T09:15:52Z

On Mon, 2010-09-13 at 10:35 +0200, Peter Zijlstra wrote:
> On Mon, 2010-09-13 at 09:08 +0200, Mike Galbraith wrote:
> > We need a better fork fairness gizmo.
>
> Proper zero-lag insertion would do. Much sadness in that tracking that
> costs a u64 mult per enqueu/dequeue and using it adds a s64 div.

(math _sucks_:)

> But if you want, have a play with:

maximum latency: 48475.3 µs
average latency: 6881.4 µs
missed timer events: 0

Darn.

make -j3 is gaining a tad over a hog as well, roughly the same as
turning START_DEBIT off.

-Mike