From: Patrick Bellasi <patrick.bellasi@arm.com>
To: Suren Baghdasaryan <surenb@google.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-pm@vger.kernel.org, linux-api@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>,
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>
Subject: Re: [PATCH v8 06/16] sched/core: uclamp: Extend sched_setattr() to support utilization clamping
Date: Tue, 7 May 2019 12:13:47 +0100 [thread overview]
Message-ID: <20190507111347.4ivnjwbymsf7i3e6@e110439-lin> (raw)
In-Reply-To: <CAJuCfpH3htcr3xB_Y4nr7HXCdQd1hOdOAXbtZJB1SOt7Of_qbw@mail.gmail.com>
On 17-Apr 15:26, Suren Baghdasaryan wrote:
> On Tue, Apr 2, 2019 at 3:42 AM Patrick Bellasi <patrick.bellasi@arm.com> wrote:
[...]
> > Do not allow to change sched class specific params and non class
> > specific params (i.e. clamp values) at the same time. This keeps things
> > simple and still works for the most common cases since we are usually
> > interested in just one of the two actions.
>
> Sorry, I can't find where you are checking to eliminate the
> possibility of simultaneous changes to both sched class specific
> params and non class specific params... Am I too tired or they are
> indeed missing?
No, you right... that limitation has been removed in v8 :)
I'll remove the above paragraph in v9, thanks for spotting it.
[...]
> > +static int uclamp_validate(struct task_struct *p,
> > + const struct sched_attr *attr)
> > +{
> > + unsigned int lower_bound = p->uclamp_req[UCLAMP_MIN].value;
> > + unsigned int upper_bound = p->uclamp_req[UCLAMP_MAX].value;
> > +
> > + if (attr->sched_flags & SCHED_FLAG_UTIL_CLAMP_MIN)
> > + lower_bound = attr->sched_util_min;
> > + if (attr->sched_flags & SCHED_FLAG_UTIL_CLAMP_MAX)
> > + upper_bound = attr->sched_util_max;
> > +
> > + if (lower_bound > upper_bound)
> > + return -EINVAL;
> > + if (upper_bound > SCHED_CAPACITY_SCALE)
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
[...]
> > static void uclamp_fork(struct task_struct *p)
> > {
> > unsigned int clamp_id;
> > @@ -1056,6 +1100,13 @@ static void __init init_uclamp(void)
> > #else /* CONFIG_UCLAMP_TASK */
> > static inline void uclamp_rq_inc(struct rq *rq, struct task_struct *p) { }
> > static inline void uclamp_rq_dec(struct rq *rq, struct task_struct *p) { }
> > +static inline int uclamp_validate(struct task_struct *p,
> > + const struct sched_attr *attr)
> > +{
> > + return -ENODEV;
>
> ENOSYS might be more appropriate?
Yep, agree, thanks!
>
> > +}
> > +static void __setscheduler_uclamp(struct task_struct *p,
> > + const struct sched_attr *attr) { }
> > static inline void uclamp_fork(struct task_struct *p) { }
> > static inline void init_uclamp(void) { }
> > #endif /* CONFIG_UCLAMP_TASK */
> > @@ -4424,6 +4475,13 @@ static void __setscheduler_params(struct task_struct *p,
> > static void __setscheduler(struct rq *rq, struct task_struct *p,
> > const struct sched_attr *attr, bool keep_boost)
> > {
> > + /*
> > + * If params can't change scheduling class changes aren't allowed
> > + * either.
> > + */
> > + if (attr->sched_flags & SCHED_FLAG_KEEP_PARAMS)
> > + return;
> > +
> > __setscheduler_params(p, attr);
> >
> > /*
> > @@ -4561,6 +4619,13 @@ static int __sched_setscheduler(struct task_struct *p,
> > return retval;
> > }
> >
> > + /* Update task specific "requested" clamps */
> > + if (attr->sched_flags & SCHED_FLAG_UTIL_CLAMP) {
> > + retval = uclamp_validate(p, attr);
> > + if (retval)
> > + return retval;
> > + }
> > +
> > /*
> > * Make sure no PI-waiters arrive (or leave) while we are
> > * changing the priority of the task:
[...]
--
#include <best/regards.h>
Patrick Bellasi
next prev parent reply other threads:[~2019-05-07 11:13 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-02 10:41 [PATCH v8 00/16] Add utilization clamping support Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 01/16] sched/core: uclamp: Add CPU's clamp buckets refcounting Patrick Bellasi
2019-04-06 23:51 ` Suren Baghdasaryan
2019-04-08 11:49 ` Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 02/16] sched/core: Add bucket local max tracking Patrick Bellasi
2019-04-15 14:51 ` Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 03/16] sched/core: uclamp: Enforce last task's UCLAMP_MAX Patrick Bellasi
2019-04-17 20:36 ` Suren Baghdasaryan
2019-05-07 10:10 ` Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 04/16] sched/core: uclamp: Add system default clamps Patrick Bellasi
2019-04-18 0:51 ` Suren Baghdasaryan
2019-05-07 10:38 ` Patrick Bellasi
2019-05-08 18:42 ` Peter Zijlstra
2019-05-09 8:43 ` Patrick Bellasi
2019-05-08 19:00 ` Peter Zijlstra
2019-05-09 8:45 ` Patrick Bellasi
2019-05-08 19:07 ` Peter Zijlstra
2019-05-08 19:15 ` Peter Zijlstra
2019-05-09 9:10 ` Patrick Bellasi
2019-05-09 11:53 ` Peter Zijlstra
2019-05-09 13:04 ` Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 05/16] sched/core: Allow sched_setattr() to use the current policy Patrick Bellasi
2019-05-08 19:21 ` Peter Zijlstra
2019-05-09 9:18 ` Patrick Bellasi
2019-05-09 11:55 ` Peter Zijlstra
2019-05-09 14:59 ` Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 06/16] sched/core: uclamp: Extend sched_setattr() to support utilization clamping Patrick Bellasi
2019-04-17 22:26 ` Suren Baghdasaryan
2019-05-07 11:13 ` Patrick Bellasi [this message]
2019-05-08 19:44 ` Peter Zijlstra
2019-05-09 9:24 ` Patrick Bellasi
2019-05-08 19:41 ` Peter Zijlstra
2019-05-09 9:23 ` Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 07/16] sched/core: uclamp: Reset uclamp values on RESET_ON_FORK Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 08/16] sched/core: uclamp: Set default clamps for RT tasks Patrick Bellasi
2019-04-17 23:07 ` Suren Baghdasaryan
2019-05-07 11:25 ` Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 09/16] sched/cpufreq: uclamp: Add clamps for FAIR and " Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 10/16] sched/core: uclamp: Add uclamp_util_with() Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 11/16] sched/fair: uclamp: Add uclamp support to energy_compute() Patrick Bellasi
2019-05-09 12:51 ` Peter Zijlstra
2019-04-02 10:41 ` [PATCH v8 12/16] sched/core: uclamp: Extend CPU's cgroup controller Patrick Bellasi
2019-04-18 0:12 ` Suren Baghdasaryan
2019-05-07 11:42 ` Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 13/16] sched/core: uclamp: Propagate parent clamps Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 14/16] sched/core: uclamp: Propagate system defaults to root group Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 15/16] sched/core: uclamp: Use TG's clamps to restrict TASK's clamps Patrick Bellasi
2019-04-02 10:41 ` [PATCH v8 16/16] sched/core: uclamp: Update CPU's refcount on TG's clamp changes Patrick Bellasi
2019-05-09 13:02 ` [PATCH v8 00/16] Add utilization clamping support Peter Zijlstra
2019-05-09 13:09 ` Patrick Bellasi
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