Messages in this thread | | | From | Vincent Guittot <> | Date | Fri, 22 Jun 2018 14:14:30 +0200 | Subject | Re: [PATCH v6 04/11] cpufreq/schedutil: use rt utilization tracking |
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On Fri, 22 Jun 2018 at 13:41, Peter Zijlstra <peterz@infradead.org> wrote: > > On Fri, Jun 22, 2018 at 10:10:32AM +0200, Vincent Guittot wrote: > > On Thu, 21 Jun 2018 at 20:57, Peter Zijlstra <peterz@infradead.org> wrote: > > > > > > > So this (and the dl etc. equivalents) result in exactly the problems > > > > complained about last time, no? > > > > > > > > What I proposed was something along the lines of: > > > > > > > > util = 1024 * sg_cpu->util_cfs; > > > > util /= (1024 - (sg_cpu->util_rt + sg_cpu->util_dl + ...)); > > > > > > > > return min(sg_cpu->max, util + sg_cpu->bw_dl); > > > > I see that you use sg_cpu->util_dl and sg_cpu->bw_dl in your equation > > above but this patch 04 only adds rt util_avg and the dl util_avg has > > not been added yet. > > dl util_avg is added in patch 6 > > So for this patch, we are only using sg_cpu->bw_dl > > Yeah, not the point really. > > It is about how we're going to use the (rt,dl,irq etc..) util values, > more than which particular one was introduced here.
ok
> > I'm just not a big fan of the whole: freq := cfs_util + rt_util thing > (as would be obvious by now).
so I'm not sure to catch what you don't like with the sum ? Is it the special case for dl and how we switch between dl_bw and dl util_avg which can generate a drop in frequency Because the increase is linear regarding rt and cfs
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