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    SubjectRe: [RFC PATCH 0/7] Introduce thermal pressure
    On Wed, 10 Oct 2018 at 14:50, Juri Lelli <juri.lelli@gmail.com> wrote:
    >
    > On 10/10/18 14:34, Vincent Guittot wrote:
    > > Hi Juri,
    > >
    > > On Wed, 10 Oct 2018 at 14:23, Juri Lelli <juri.lelli@gmail.com> wrote:
    > > >
    > > > On 10/10/18 14:04, Vincent Guittot wrote:
    > > >
    > > > [...]
    > > >
    > > > > The problem was the same with RT, the cfs utilization was lower than
    > > > > reality because RT steals soem cycle to CFS
    > > > > So schedutil was selecting a lower frequency when cfs was running
    > > > > whereas the CPU was fully used.
    > > > > The same can happen with thermal:
    > > > > cap the max freq because of thermal
    > > > > the utilization with decrease.
    > > > > remove the cap
    > > > > the utilization is still low and you will select a low OPP because you
    > > > > don't take into account cycle stolen by thermal like with RT
    > > >
    > > > What if we scale frequency component considering the capped temporary
    > > > max?
    > >
    > > Do you mean using a kind of scale_thermal_capacity in accumulate_sum
    > > when computing utilization ?
    >
    > Yeah, something like that I guess. So that we account for temporary
    > "fake" 1024..

    But the utilization will not be invariant anymore across the system

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