From: Patrick Bellasi <patrick.bellasi@arm.com>
To: Dietmar Eggemann <dietmar.eggemann@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>,
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 08/14] sched/core: uclamp: extend cpu's cgroup controller
Date: Fri, 17 Aug 2018 15:24:15 +0100 [thread overview]
Message-ID: <20180817142415.GK2960@e110439-lin> (raw)
In-Reply-To: <82db1123-339f-0dbf-9332-7e37ee9e4f20@arm.com>
On 17-Aug 14:21, Dietmar Eggemann wrote:
> On 08/06/2018 06:39 PM, Patrick Bellasi wrote:
>
> [...]
>
> >Give the above mechanisms, it is now possible to extend the cpu
> >controller to specify what is the minimum (or maximum) utilization which
> >a task is expected (or allowed) to generate.
> >Constraints on minimum and maximum utilization allowed for tasks in a
> >CPU cgroup can improve the control on the actual amount of CPU bandwidth
> >consumed by tasks.
>
> I assume this is covered by the s/bandwidth/capacity/ you had w/ Juri on
> 01/14.
Yes... I need to update this changelog too.
> [...]
>
> >diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> >index ff76b000bbe8..2ba55a4afffb 100644
> >--- a/kernel/sched/core.c
> >+++ b/kernel/sched/core.c
> >@@ -1211,6 +1211,74 @@ static inline void uclamp_group_get(struct task_struct *p,
> > uclamp_group_put(clamp_id, prev_group_id);
> > }
> >+#ifdef CONFIG_UCLAMP_TASK_GROUP
> >+/**
> >+ * init_uclamp_sched_group: initialize data structures required for TG's
> >+ * utilization clamping
> >+ */
> >+static inline void init_uclamp_sched_group(void)
> >+{
> >+ struct uclamp_map *uc_map;
> >+ struct uclamp_se *uc_se;
> >+ int group_id;
> >+ int clamp_id;
> >+
> >+ /* Root TG's is statically assigned to the first clamp group */
> >+ group_id = 0;
> >+
> >+ /* Initialize root TG's to default (none) clamp values */
> >+ for (clamp_id = 0; clamp_id < UCLAMP_CNT; ++clamp_id) {
> >+ uc_map = &uclamp_maps[clamp_id][0];
> >+
> >+ /* Map root TG's clamp value */
> >+ uclamp_group_init(clamp_id, group_id, uclamp_none(clamp_id));
> >+
> >+ /* Init root TG's clamp group */
> >+ uc_se = &root_task_group.uclamp[clamp_id];
> >+ uc_se->value = uclamp_none(clamp_id);
> >+ uc_se->group_id = group_id;
> >+
> >+ /* Attach root TG's clamp group */
> >+ uc_map[group_id].se_count = 1;
> >+ }
> >+}
>
> Can you not save some lines here:
>
> static inline void init_uclamp_sched_group(void)
> {
> - struct uclamp_map *uc_map;
> struct uclamp_se *uc_se;
> int group_id;
> int clamp_id;
> @@ -1228,8 +1227,6 @@ static inline void init_uclamp_sched_group(void)
>
> /* Initialize root TG's to default (none) clamp values */
> for (clamp_id = 0; clamp_id < UCLAMP_CNT; ++clamp_id) {
> - uc_map = &uclamp_maps[clamp_id][0];
> -
> /* Map root TG's clamp value */
> uclamp_group_init(clamp_id, group_id,
> uclamp_none(clamp_id));
>
> @@ -1239,7 +1236,7 @@ static inline void init_uclamp_sched_group(void)
> uc_se->group_id = group_id;
>
> /* Attach root TG's clamp group */
> - uc_map[group_id].se_count = 1;
> + uclamp_maps[clamp_id][group_id].se_count = 1;
> }
>
> This would also make uclamp_group_available() smaller.
Unfortunately this var name and its matrix indexes tends to become
quite long easily and in some usages we exceed the 80 columns sometimes.
That's why, for consistency, I always shortcut to *uc_map a reference
to a clamp group and use that variable name consistently in the code.
I'll see if it's possible to get rid of the shortcut in the next version.
--
#include <best/regards.h>
Patrick Bellasi
next prev parent reply other threads:[~2018-08-17 14:24 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 [this message]
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
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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