linux-kernel - Re: [PATCH 6/6] psi: introduce psi monitor

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Message-ID: <CAJuCfpFp7v4oc9LL0TVMiYavOMOvDs5y=kQ8S7URtKojkWmH7Q@mail.gmail.com>
Date:   Mon, 17 Dec 2018 17:22:35 -0800
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tejun Heo <tj@...nel.org>, lizefan@...wei.com,
        Johannes Weiner <hannes@...xchg.org>, axboe@...nel.dk,
        dennis@...nel.org, Dennis Zhou <dennisszhou@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>, cgroups@...r.kernel.org,
        linux-mm <linux-mm@...ck.org>, linux-doc@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, kernel-team@...roid.com
Subject: Re: [PATCH 6/6] psi: introduce psi monitor

On Mon, Dec 17, 2018 at 8:37 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Fri, Dec 14, 2018 at 09:15:08AM -0800, Suren Baghdasaryan wrote:
> > @@ -358,28 +526,23 @@ static void psi_update_work(struct work_struct *work)
> >  {
> >       struct delayed_work *dwork;
> >       struct psi_group *group;
> > +     u64 next_update;
> >
> >       dwork = to_delayed_work(work);
> >       group = container_of(dwork, struct psi_group, clock_work);
> >
> >       /*
> > +      * Periodically fold the per-cpu times and feed samples
> > +      * into the running averages.
> >        */
> >
> > +     psi_update(group);
> >
> > +     /* Calculate closest update time */
> > +     next_update = min(group->polling_next_update,
> > +                             group->avg_next_update);
> > +     schedule_delayed_work(dwork, min(PSI_FREQ,
> > +             nsecs_to_jiffies(next_update - sched_clock()) + 1));
>
> See, so I don't at _all_ like how there is no idle option..

Copy that. Will see what we can do to bring it back.
Thanks!

> >  }
>
>
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