From: Patrick Bellasi <patrick.bellasi@arm.com>
To: Juri Lelli <juri.lelli@redhat.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>
Subject: Re: [PATCH v4 02/16] sched/core: uclamp: map TASK's clamp values into CPU's clamp groups
Date: Thu, 6 Sep 2018 15:00:26 +0100 [thread overview]
Message-ID: <20180906140026.GC25636@e110439-lin> (raw)
In-Reply-To: <20180906081728.GB27626@localhost.localdomain>
On 06-Sep 10:17, Juri Lelli wrote:
> On 28/08/18 14:53, Patrick Bellasi wrote:
>
> [...]
>
> > static inline int __setscheduler_uclamp(struct task_struct *p,
> > const struct sched_attr *attr)
> > {
> > - if (attr->sched_util_min > attr->sched_util_max)
> > - return -EINVAL;
> > - if (attr->sched_util_max > SCHED_CAPACITY_SCALE)
> > - return -EINVAL;
> > + int group_id[UCLAMP_CNT] = { UCLAMP_NOT_VALID };
> > + int lower_bound, upper_bound;
> > + struct uclamp_se *uc_se;
> > + int result = 0;
> >
> > - p->uclamp[UCLAMP_MIN] = attr->sched_util_min;
> > - p->uclamp[UCLAMP_MAX] = attr->sched_util_max;
> > + mutex_lock(&uclamp_mutex);
> >
> > - return 0;
> > + /* Find a valid group_id for each required clamp value */
> > + if (attr->sched_flags & SCHED_FLAG_UTIL_CLAMP_MIN) {
> > + upper_bound = (attr->sched_flags & SCHED_FLAG_UTIL_CLAMP_MAX)
> > + ? attr->sched_util_max
> > + : p->uclamp[UCLAMP_MAX].value;
> > +
> > + if (upper_bound == UCLAMP_NOT_VALID)
> > + upper_bound = SCHED_CAPACITY_SCALE;
> > + if (attr->sched_util_min > upper_bound) {
> > + result = -EINVAL;
> > + goto done;
> > + }
> > +
> > + result = uclamp_group_find(UCLAMP_MIN, attr->sched_util_min);
> > + if (result == -ENOSPC) {
> > + pr_err(UCLAMP_ENOSPC_FMT, "MIN");
> > + goto done;
> > + }
> > + group_id[UCLAMP_MIN] = result;
> > + }
> > + if (attr->sched_flags & SCHED_FLAG_UTIL_CLAMP_MAX) {
> > + lower_bound = (attr->sched_flags & SCHED_FLAG_UTIL_CLAMP_MIN)
> > + ? attr->sched_util_min
> > + : p->uclamp[UCLAMP_MIN].value;
> > +
> > + if (lower_bound == UCLAMP_NOT_VALID)
> > + lower_bound = 0;
> > + if (attr->sched_util_max < lower_bound ||
> > + attr->sched_util_max > SCHED_CAPACITY_SCALE) {
> > + result = -EINVAL;
> > + goto done;
> > + }
> > +
> > + result = uclamp_group_find(UCLAMP_MAX, attr->sched_util_max);
> > + if (result == -ENOSPC) {
> > + pr_err(UCLAMP_ENOSPC_FMT, "MAX");
> > + goto done;
> > + }
> > + group_id[UCLAMP_MAX] = result;
> > + }
>
> Don't you have to reset result to 0 here (it seems what follows cannot
> fail anymore)? Otherwise this function will return latest
> uclamp_group_find return value, which will be interpreted as error if
> not 0.
Yes, wired.. it uses to work on my tests just because I return from
the caller on !0 and:
- that's just good enough to set by uclamps
- my current rt-app integration does not check the sycall return value
- my tests never request the clamp_group mapped on group_id=0
:(
Will fix both this and the rt-app integration and the tests !
Cheers Patrick
--
#include <best/regards.h>
Patrick Bellasi
next prev parent reply other threads:[~2018-09-06 14:00 UTC|newest]
Thread overview: 80+ 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 ` [PATCH v4 01/16] sched/core: uclamp: extend sched_setattr to support utilization clamping Patrick Bellasi
2018-09-05 11:01 ` Juri Lelli
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 [this message]
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
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