From: Quentin Perret <quentin.perret@arm.com>
To: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Thara Gopinath <thara.gopinath@linaro.org>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Zhang Rui <rui.zhang@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Amit Kachhap <amit.kachhap@gmail.com>,
viresh kumar <viresh.kumar@linaro.org>,
Javi Merino <javi.merino@kernel.org>,
Eduardo Valentin <edubezval@gmail.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Nicolas Dechesne <nicolas.dechesne@linaro.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>
Subject: Re: [PATCH V2 1/3] Calculate Thermal Pressure
Date: Thu, 25 Apr 2019 13:47:44 +0100 [thread overview]
Message-ID: <20190425124741.y5stnnf7moujmout@queper01-ThinkPad-T460s> (raw)
In-Reply-To: <CAKfTPtBvY3xiDt6tcqF7GoZki3VihD4Tz7E5ctE8hNaNzL6NPA@mail.gmail.com>
On Thursday 25 Apr 2019 at 14:45:57 (+0200), Vincent Guittot wrote:
> On Thu, 25 Apr 2019 at 12:57, Quentin Perret <quentin.perret@arm.com> wrote:
> >
> > On Tuesday 16 Apr 2019 at 15:38:39 (-0400), Thara Gopinath wrote:
> > > +/* Per cpu structure to keep track of Thermal Pressure */
> > > +struct thermal_pressure {
> > > + unsigned long scale; /* scale reflecting average cpu max capacity*/
> > > + unsigned long acc_scale; /* Accumulated scale for this time window */
> > > + unsigned long old_scale; /* Scale value for the previous window */
> > > + unsigned long raw_scale; /* Raw max capacity */
> > > + unsigned long age_stamp; /* Last time old_scale was updated */
> > > + unsigned long last_update; /* Last time acc_scale was updated */
> > > + spinlock_t lock; /* Lock for protecting from simultaneous access*/
> > > + /* Timer for periodic update of thermal pressure */
> > > + struct timer_list timer;
> >
> > Do you actually need the periodic update ? You only really need to
> > update the 'scale' value when updating the LB stats no ? Nobody
> > accesses that value in between two LBs.
>
> Do you mean calling a variant of sched_update_thermal_pressure() in
> update_cpu_capacity() instead of periodic update ?
> Yes , that should be enough
Right something like this, and remove all the timers. Should be a bit
cleaner I guess.
Thanks,
Quentin
next prev parent reply other threads:[~2019-04-25 12:47 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-16 19:38 [PATCH V2 0/3] Introduce Thermal Pressure Thara Gopinath
2019-04-16 19:38 ` [PATCH V2 1/3] Calculate " Thara Gopinath
2019-04-18 10:14 ` Quentin Perret
2019-04-24 4:13 ` Thara Gopinath
2019-04-24 16:38 ` Peter Zijlstra
2019-04-24 16:45 ` Peter Zijlstra
2019-04-25 10:57 ` Quentin Perret
2019-04-25 12:45 ` Vincent Guittot
2019-04-25 12:47 ` Quentin Perret [this message]
2019-04-26 14:17 ` Thara Gopinath
2019-05-08 12:41 ` Quentin Perret
2019-04-16 19:38 ` [PATCH V2 2/3] sched/fair: update cpu_capcity to reflect thermal pressure Thara Gopinath
2019-04-16 19:38 ` [PATCH V3 3/3] thermal/cpu-cooling: Update thermal pressure in case of a maximum frequency capping Thara Gopinath
2019-04-18 9:48 ` Quentin Perret
2019-04-23 22:38 ` Thara Gopinath
2019-04-24 15:56 ` Ionela Voinescu
2019-04-26 10:24 ` Thara Gopinath
2019-04-25 10:45 ` Quentin Perret
2019-04-25 12:04 ` Vincent Guittot
2019-04-25 12:50 ` Quentin Perret
2019-04-26 13:47 ` Thara Gopinath
2019-04-24 16:47 ` Peter Zijlstra
2019-04-17 5:36 ` [PATCH V2 0/3] Introduce Thermal Pressure Ingo Molnar
2019-04-17 5:55 ` Ingo Molnar
2019-04-17 17:28 ` Thara Gopinath
2019-04-17 17:18 ` Thara Gopinath
2019-04-17 18:29 ` Ingo Molnar
2019-04-18 0:07 ` Thara Gopinath
2019-04-18 9:22 ` Quentin Perret
2019-04-24 16:34 ` Peter Zijlstra
2019-04-25 17:33 ` Ingo Molnar
2019-04-25 17:44 ` Ingo Molnar
2019-04-26 7:08 ` Vincent Guittot
2019-04-26 8:35 ` Ingo Molnar
2019-04-24 15:57 ` Ionela Voinescu
2019-04-26 11:50 ` Thara Gopinath
2019-04-26 14:46 ` Ionela Voinescu
2019-04-29 13:29 ` Ionela Voinescu
2019-04-30 14:39 ` Ionela Voinescu
2019-04-30 16:10 ` Thara Gopinath
2019-05-02 10:44 ` Ionela Voinescu
2019-04-30 15:57 ` Thara Gopinath
2019-04-30 16:02 ` Thara Gopinath
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