From: Patrick Bellasi <patrick.bellasi@arm.com>
To: Pavan Kondeti <pkondeti@codeaurora.org>
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>,
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>
Subject: Re: [PATCH v3 09/14] sched/core: uclamp: propagate parent clamps
Date: Thu, 16 Aug 2018 15:07:31 +0100 [thread overview]
Message-ID: <20180816140731.GD2960@e110439-lin> (raw)
In-Reply-To: <20180816090906.GC2661@codeaurora.org>
On 16-Aug 14:39, Pavan Kondeti wrote:
> On Mon, Aug 06, 2018 at 05:39:41PM +0100, Patrick Bellasi wrote:
[...]
> > diff --git a/include/linux/sched.h b/include/linux/sched.h
> > index 8f48e64fb8a6..3fac2d098084 100644
> > --- a/include/linux/sched.h
> > +++ b/include/linux/sched.h
> > @@ -589,6 +589,11 @@ struct uclamp_se {
> > unsigned int value;
> > /* Utilization clamp group for this constraint */
> > unsigned int group_id;
> > + /* Effective clamp for tasks in this group */
> > + struct {
> > + unsigned int value;
> > + unsigned int group_id;
> > + } effective;
> > };
>
> Are these needed when CONFIG_UCLAMP_TASK_GROUP is disabled?
Mmm... not entirely, at least not the value.
While working on v4 I've notice that:
(1) task_struct::uclamp::effective::group_id
can be used for the back annotation we add in:
[PATCH v3 11/14] sched/core: uclamp: use TG's clamps to restrict Task's clamps
using the additional field:
(2) task_struct::uclamp_group_id
So, I'm updating that patch to re-use (1) instead of adding (2).
Regarding:
(3) task_struct::uclamp::effective::value
it can be used to track the task's effective clamp value once I add
the discretization support discussed with Juri in:
https://lore.kernel.org/lkml/20180809152313.lewfhufidhxb2qrk@darkstar/
So, I would say that in v4 I can try to see if and how we can guard
(some of) the effective values on !CONFIG_UCLAMP_TASK_GROUP
configurations...
>
> > union rcu_special {
> > diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> > index 2ba55a4afffb..f692df3787bd 100644
> > --- a/kernel/sched/core.c
> > +++ b/kernel/sched/core.c
> > @@ -1237,6 +1237,8 @@ static inline void init_uclamp_sched_group(void)
> > uc_se = &root_task_group.uclamp[clamp_id];
> > uc_se->value = uclamp_none(clamp_id);
> > uc_se->group_id = group_id;
> > + uc_se->effective.value = uclamp_none(clamp_id);
> > + uc_se->effective.group_id = group_id;
> >
> > /* Attach root TG's clamp group */
> > uc_map[group_id].se_count = 1;
> >
>
> <snip>
>
> > @@ -7622,11 +7687,19 @@ static struct cftype cpu_legacy_files[] = {
> > .read_u64 = cpu_util_min_read_u64,
> > .write_u64 = cpu_util_min_write_u64,
> > },
> > + {
> > + .name = "util.min.effective",
> > + .read_u64 = cpu_util_min_effective_read_u64,
> > + },
> > {
> > .name = "util.max",
> > .read_u64 = cpu_util_max_read_u64,
> > .write_u64 = cpu_util_max_write_u64,
> > },
> > + {
> > + .name = "util.max.effective",
> > + .read_u64 = cpu_util_max_effective_read_u64,
> > + },
> > #endif
> > { } /* Terminate */
> > };
>
> Is there any reason why these are not added for the default hierarchy?
Not really, good point!
I think I've just forgot them... which makes me notice that I still
have to improve the coverage for my tests on the default hierarchy.
I don't expect big difference, since the behaviors should be the
same but...
Thanks for pointing this out... will had the attributes in the
upcoming v4.
Cheers,
Patrick
--
#include <best/regards.h>
Patrick Bellasi
next prev parent reply other threads:[~2018-08-16 14:07 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-06 16:39 [PATCH v3 00/14] Add utilization clamping support Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 01/14] sched/core: uclamp: extend sched_setattr to support utilization clamping Patrick Bellasi
2018-08-06 16:50 ` Randy Dunlap
2018-08-09 8:39 ` Patrick Bellasi
2018-08-09 15:20 ` Randy Dunlap
2018-08-07 9:59 ` Juri Lelli
2018-08-13 12:14 ` Patrick Bellasi
2018-08-13 12:27 ` Juri Lelli
2018-08-07 12:35 ` Juri Lelli
2018-08-09 9:14 ` Patrick Bellasi
2018-08-09 9:50 ` Juri Lelli
2018-08-09 15:23 ` Patrick Bellasi
2018-08-10 7:50 ` Juri Lelli
2018-08-17 10:34 ` Quentin Perret
2018-08-17 10:57 ` Patrick Bellasi
2018-08-17 11:14 ` Quentin Perret
2018-08-06 16:39 ` [PATCH v3 02/14] sched/core: uclamp: map TASK's clamp values into CPU's clamp groups Patrick Bellasi
2018-08-14 11:25 ` Pavan Kondeti
2018-08-14 15:21 ` Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 03/14] sched/core: uclamp: add CPU's clamp groups accounting Patrick Bellasi
2018-08-14 15:44 ` Dietmar Eggemann
2018-08-14 16:49 ` Patrick Bellasi
2018-08-15 9:37 ` Dietmar Eggemann
2018-08-15 10:54 ` Patrick Bellasi
2018-08-15 10:59 ` Dietmar Eggemann
2018-08-16 13:32 ` Patrick Bellasi
2018-08-16 13:37 ` Quentin Perret
2018-08-16 13:45 ` Dietmar Eggemann
2018-08-16 14:21 ` Quentin Perret
2018-08-16 15:00 ` Dietmar Eggemann
2018-08-17 11:04 ` Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 04/14] sched/core: uclamp: update CPU's refcount on clamp changes Patrick Bellasi
2018-08-15 15:02 ` Dietmar Eggemann
2018-08-16 13:22 ` Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 05/14] sched/cpufreq: uclamp: add utilization clamping for FAIR tasks Patrick Bellasi
2018-08-08 13:18 ` Vincent Guittot
2018-08-09 15:30 ` Patrick Bellasi
2018-08-15 15:30 ` Dietmar Eggemann
2018-08-16 13:53 ` Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 06/14] sched/cpufreq: uclamp: add utilization clamping for RT tasks Patrick Bellasi
2018-08-07 13:26 ` Juri Lelli
2018-08-09 15:34 ` Patrick Bellasi
2018-08-09 16:03 ` Vincent Guittot
2018-08-13 10:12 ` Patrick Bellasi
2018-08-13 10:50 ` Juri Lelli
2018-08-13 12:07 ` Vincent Guittot
2018-08-13 12:09 ` Vincent Guittot
2018-08-13 12:49 ` Patrick Bellasi
2018-08-13 14:06 ` Vincent Guittot
2018-08-13 15:01 ` Patrick Bellasi
2018-08-16 10:34 ` Dietmar Eggemann
2018-08-16 13:40 ` Patrick Bellasi
2018-08-07 13:54 ` Quentin Perret
2018-08-09 15:41 ` Patrick Bellasi
2018-08-09 15:55 ` Quentin Perret
2018-08-13 10:17 ` Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 07/14] sched/core: uclamp: enforce last task UCLAMP_MAX Patrick Bellasi
2018-08-16 15:43 ` Dietmar Eggemann
2018-08-16 16:47 ` Patrick Bellasi
2018-08-16 17:10 ` Dietmar Eggemann
2018-08-16 17:27 ` Patrick Bellasi
2018-08-16 17:20 ` Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 08/14] sched/core: uclamp: extend cpu's cgroup controller Patrick Bellasi
2018-08-17 12:21 ` Dietmar Eggemann
2018-08-17 14:24 ` Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 09/14] sched/core: uclamp: propagate parent clamps Patrick Bellasi
2018-08-16 9:09 ` Pavan Kondeti
2018-08-16 14:07 ` Patrick Bellasi [this message]
2018-08-17 13:43 ` Dietmar Eggemann
2018-08-17 14:45 ` Patrick Bellasi
2018-08-17 15:50 ` Dietmar Eggemann
2018-08-20 10:01 ` Dietmar Eggemann
2018-08-20 12:28 ` Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 10/14] sched/core: uclamp: map TG's clamp values into CPU's clamp groups Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 11/14] sched/core: uclamp: use TG's clamps to restrict Task's clamps Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 12/14] sched/core: uclamp: add system default clamps Patrick Bellasi
2018-08-16 9:13 ` Pavan Kondeti
2018-08-16 14:37 ` Patrick Bellasi
2018-08-20 10:18 ` Dietmar Eggemann
2018-08-20 12:27 ` Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 13/14] sched/core: uclamp: update CPU's refcount on TG's clamp changes Patrick Bellasi
2018-08-06 16:39 ` [PATCH v3 14/14] sched/core: uclamp: use percentage clamp values Patrick Bellasi
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