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From: Tejun Heo <tj@kernel.org>
To: Patrick Bellasi <patrick.bellasi@arm.com>
Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
	Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Paul Turner <pjt@google.com>,
	Quentin Perret <quentin.perret@arm.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Morten Rasmussen <morten.rasmussen@arm.com>,
	Juri Lelli <juri.lelli@redhat.com>, Todd Kjos <tkjos@google.com>,
	Joel Fernandes <joelaf@google.com>,
	Steve Muckle <smuckle@google.com>,
	Suren Baghdasaryan <surenb@google.com>,
	Alessio Balsini <balsini@android.com>
Subject: Re: [PATCH v10 13/16] sched/core: uclamp: Propagate parent clamps
Date: Mon, 24 Jun 2019 10:46:07 -0700	[thread overview]
Message-ID: <20190624174607.GQ657710@devbig004.ftw2.facebook.com> (raw)
In-Reply-To: <20190624173405.enrxqalaqinbgsut@e110439-lin>

Hello, Patrick.

On Mon, Jun 24, 2019 at 06:34:05PM +0100, Patrick Bellasi wrote:
> > On Fri, Jun 21, 2019 at 09:42:14AM +0100, Patrick Bellasi wrote:
> > > Since it can be interesting for userspace, e.g. system management
> > > software, to know exactly what the currently propagated/enforced
> > > configuration is, the effective clamp values are exposed to user-space
> > > by means of a new pair of read-only attributes
> > > cpu.util.{min,max}.effective.
> > 
> > Can we not add the effective interface file for now?
> 
> You mean just the (read-only) user-space API right?

Yeah.

> I found it quite convenient, even just for debugging.
> Moreover it allows a container to know what it's exactly getting...

I fully agree.

> > I don't think it's a bad idea but would like to think more about it.
> > For cpuset, it was needed because configuration was so interwoven
> > with the effective masks, but we don't generally do this for other
> > min/max or weight knobs, all of which have effective hierarchical
> > values and I'm not quite sure about adding .effective for all of
> > them.
> > It could be that that's what we end up doing eventually but
> > I'd like to think a bit more about it.
> 
> ... but I see your point and, since it's not strictly required, I
> think we can drop it in v11. Will check better if it's of any use
> apart from debugging/testing support.

Yeah, I just wanna figure out a plan which works for other controllers
too.  It could be that the right thing to do is just adding .effective
to everything but idk I need to think more about it.

Thanks.

-- 
tejun

  reply	other threads:[~2019-06-24 17:46 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-21  8:42 [PATCH v10 00/16] Add utilization clamping support Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 01/16] sched/core: uclamp: Add CPU's clamp buckets refcounting Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 02/16] sched/core: uclamp: Add bucket local max tracking Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 03/16] sched/core: uclamp: Enforce last task's UCLAMP_MAX Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 04/16] sched/core: uclamp: Add system default clamps Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 05/16] sched/core: Allow sched_setattr() to use the current policy Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 06/16] sched/core: uclamp: Extend sched_setattr() to support utilization clamping Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 07/16] sched/core: uclamp: Reset uclamp values on RESET_ON_FORK Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 08/16] sched/core: uclamp: Set default clamps for RT tasks Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 09/16] sched/cpufreq: uclamp: Add clamps for FAIR and " Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 10/16] sched/core: uclamp: Add uclamp_util_with() Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 11/16] sched/fair: uclamp: Add uclamp support to energy_compute() Patrick Bellasi
2019-06-21 14:01   ` Peter Zijlstra
2019-06-21 14:47     ` Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 12/16] sched/core: uclamp: Extend CPU's cgroup controller Patrick Bellasi
2019-06-22 15:03   ` Tejun Heo
2019-06-24 17:29     ` Patrick Bellasi
2019-06-24 17:52       ` Tejun Heo
2019-06-25  9:31         ` Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 13/16] sched/core: uclamp: Propagate parent clamps Patrick Bellasi
2019-06-22 15:07   ` Tejun Heo
2019-06-24 17:34     ` Patrick Bellasi
2019-06-24 17:46       ` Tejun Heo [this message]
2019-06-21  8:42 ` [PATCH v10 14/16] sched/core: uclamp: Propagate system defaults to root group Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 15/16] sched/core: uclamp: Use TG's clamps to restrict TASK's clamps Patrick Bellasi
2019-06-21  8:42 ` [PATCH v10 16/16] sched/core: uclamp: Update CPU's refcount on TG's clamp changes Patrick Bellasi
2019-06-21 14:55 ` [PATCH v10 00/16] Add utilization clamping support Patrick Bellasi

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