From: Juri Lelli <juri.lelli@redhat.com>
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>, Tejun Heo <tj@kernel.org>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
Viresh Kumar <viresh.kumar@linaro.org>,
Vincent Guittot <vincent.guittot@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>,
Todd Kjos <tkjos@google.com>, Joel Fernandes <joelaf@google.com>,
Steve Muckle <smuckle@google.com>,
Suren Baghdasaryan <surenb@google.com>,
Randy Dunlap <rdunlap@infradead.org>,
linux-api@vger.kernel.org
Subject: Re: [PATCH v4 01/16] sched/core: uclamp: extend sched_setattr to support utilization clamping
Date: Wed, 5 Sep 2018 13:01:08 +0200 [thread overview]
Message-ID: <20180905110108.GC20267@localhost.localdomain> (raw)
In-Reply-To: <20180828135324.21976-2-patrick.bellasi@arm.com>
Hi,
On 28/08/18 14:53, Patrick Bellasi wrote:
[...]
> Let's introduce a new API to set utilization clamping values for a
> specified task by extending sched_setattr, a syscall which already
> allows to define task specific properties for different scheduling
> classes.
> Specifically, a new pair of attributes allows to specify a minimum and
> maximum utilization which the scheduler should consider for a task.
AFAIK sched_setattr currently mandates that a policy is always specified
[1]. I was wondering if relaxing such requirement might be handy. Being
util clamp a cross-class feature it might be cumbersome to always have
to get current policy/params and use those with new umin/umax just to
change the latter.
sched_setparam already uses the in-kernel SETPARAM_POLICY thing, maybe
we could extend that to sched_setattr? Not sure exposing this to
userspace is a good idea though. :-/
Best,
- Juri
1 - https://elixir.bootlin.com/linux/v4.19-rc2/source/kernel/sched/core.c#L4564
next prev parent reply other threads:[~2018-09-05 11:01 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-28 13:53 [PATCH v4 00/16] Add utilization clamping support Patrick Bellasi
2018-08-28 13:53 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 01/16] sched/core: uclamp: extend sched_setattr to support utilization clamping Patrick Bellasi
2018-09-05 11:01 ` Juri Lelli [this message]
2018-08-28 13:53 ` [PATCH v4 02/16] sched/core: uclamp: map TASK's clamp values into CPU's clamp groups Patrick Bellasi
2018-09-05 10:45 ` Juri Lelli
2018-09-06 13:48 ` Patrick Bellasi
2018-09-06 14:13 ` Juri Lelli
2018-09-06 8:17 ` Juri Lelli
2018-09-06 14:00 ` Patrick Bellasi
2018-09-08 23:47 ` Suren Baghdasaryan
2018-09-12 10:32 ` Patrick Bellasi
2018-09-12 13:49 ` Peter Zijlstra
2018-09-12 15:56 ` Patrick Bellasi
2018-09-12 16:12 ` Peter Zijlstra
2018-09-12 17:35 ` Patrick Bellasi
2018-09-12 17:42 ` Peter Zijlstra
2018-09-12 17:52 ` Patrick Bellasi
2018-09-13 19:14 ` Peter Zijlstra
2018-09-14 8:51 ` Patrick Bellasi
2018-09-12 16:24 ` Peter Zijlstra
2018-09-12 17:42 ` Patrick Bellasi
2018-09-13 19:20 ` Peter Zijlstra
2018-09-14 8:47 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 03/16] sched/core: uclamp: add CPU's clamp groups accounting Patrick Bellasi
2018-09-12 17:34 ` Peter Zijlstra
2018-09-12 17:44 ` Patrick Bellasi
2018-09-13 19:12 ` Peter Zijlstra
2018-09-14 9:07 ` Patrick Bellasi
2018-09-14 11:52 ` Peter Zijlstra
2018-09-14 13:41 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 04/16] sched/core: uclamp: update CPU's refcount on clamp changes Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 05/16] sched/core: uclamp: enforce last task UCLAMP_MAX Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 06/16] sched/cpufreq: uclamp: add utilization clamping for FAIR tasks Patrick Bellasi
2018-09-14 9:32 ` Peter Zijlstra
2018-09-14 13:19 ` Patrick Bellasi
2018-09-14 13:36 ` Peter Zijlstra
2018-09-14 13:57 ` Patrick Bellasi
2018-09-27 10:23 ` Quentin Perret
2018-08-28 13:53 ` [PATCH v4 07/16] sched/core: uclamp: extend cpu's cgroup controller Patrick Bellasi
2018-08-28 18:29 ` Randy Dunlap
2018-08-29 8:53 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 08/16] sched/core: uclamp: propagate parent clamps Patrick Bellasi
2018-09-09 3:02 ` Suren Baghdasaryan
2018-09-12 12:51 ` Patrick Bellasi
2018-09-12 15:56 ` Suren Baghdasaryan
2018-09-11 15:18 ` Tejun Heo
2018-09-11 16:26 ` Patrick Bellasi
2018-09-11 16:28 ` Tejun Heo
2018-08-28 13:53 ` [PATCH v4 09/16] sched/core: uclamp: map TG's clamp values into CPU's clamp groups Patrick Bellasi
2018-09-09 18:52 ` Suren Baghdasaryan
2018-09-12 14:19 ` Patrick Bellasi
2018-09-12 15:53 ` Suren Baghdasaryan
2018-08-28 13:53 ` [PATCH v4 10/16] sched/core: uclamp: use TG's clamps to restrict Task's clamps Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 11/16] sched/core: uclamp: add system default clamps Patrick Bellasi
2018-09-10 16:20 ` Suren Baghdasaryan
2018-09-11 16:46 ` Patrick Bellasi
2018-09-11 19:25 ` Suren Baghdasaryan
2018-08-28 13:53 ` [PATCH v4 12/16] sched/core: uclamp: update CPU's refcount on TG's clamp changes Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 13/16] sched/core: uclamp: use percentage clamp values Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 14/16] sched/core: uclamp: request CAP_SYS_ADMIN by default Patrick Bellasi
2018-09-04 13:47 ` Juri Lelli
2018-09-06 14:40 ` Patrick Bellasi
2018-09-06 14:59 ` Juri Lelli
2018-09-06 17:21 ` Patrick Bellasi
2018-09-14 11:10 ` Peter Zijlstra
2018-09-14 14:07 ` Patrick Bellasi
2018-09-14 14:28 ` Peter Zijlstra
2018-09-17 12:27 ` Patrick Bellasi
2018-09-21 9:13 ` Peter Zijlstra
2018-09-24 15:14 ` Patrick Bellasi
2018-09-24 15:56 ` Peter Zijlstra
2018-09-24 17:23 ` Patrick Bellasi
2018-09-24 16:26 ` Peter Zijlstra
2018-09-24 17:19 ` Patrick Bellasi
2018-09-25 15:49 ` Peter Zijlstra
2018-09-26 10:43 ` Patrick Bellasi
2018-09-27 10:00 ` Quentin Perret
2018-09-26 17:51 ` Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 15/16] sched/core: uclamp: add clamp group discretization support Patrick Bellasi
2018-08-28 13:53 ` [PATCH v4 16/16] sched/cpufreq: uclamp: add utilization clamping for RT tasks Patrick Bellasi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180905110108.GC20267@localhost.localdomain \
--to=juri.lelli@redhat.com \
--cc=dietmar.eggemann@arm.com \
--cc=joelaf@google.com \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=morten.rasmussen@arm.com \
--cc=patrick.bellasi@arm.com \
--cc=peterz@infradead.org \
--cc=pjt@google.com \
--cc=quentin.perret@arm.com \
--cc=rafael.j.wysocki@intel.com \
--cc=rdunlap@infradead.org \
--cc=smuckle@google.com \
--cc=surenb@google.com \
--cc=tj@kernel.org \
--cc=tkjos@google.com \
--cc=vincent.guittot@linaro.org \
--cc=viresh.kumar@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.