Messages in this thread | | | Date | Fri, 22 Jun 2018 15:29:53 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v6 04/11] cpufreq/schedutil: use rt utilization tracking |
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On Fri, Jun 22, 2018 at 01:54:34PM +0100, Quentin Perret wrote: > On Friday 22 Jun 2018 at 13:37:13 (+0200), Peter Zijlstra wrote: > > That is true.. So we could limit the scaling to the case where there is > > no idle time, something like: > > > > util = sg_cpu->util_cfs; > > > > cap_cfs = (1024 - (sg_cpu->util_rt + ...)); > > if (util == cap_cfs) > > util = sg_cpu->max; > > > > That specifically handles the '0% idle -> 100% freq' case, but I don't > > realy like edge behaviour like that. If for some reason it all doesn't > > quite align you're left with bits. > > > > And the linear scaling is the next simplest thing that avoids the hard > > boundary case. > > Right, so maybe we'll get something smoother by just summing the signals > as Vincent is proposing ?
Sure, but see my previous mail just now, that has the problem of u_{rt,dl} distoting f_{rt,dl} even when there is no u_cfs.
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