linux-kernel - [PATCH v2 0/3] DL capacity-aware fixes

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Message-Id: <20220729111305.1275158-1-dietmar.eggemann@arm.com>
Date:   Fri, 29 Jul 2022 13:13:02 +0200
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Mel Gorman <mgorman@...e.de>, Ben Segall <bsegall@...gle.com>,
        Luca Abeni <luca.abeni@...tannapisa.it>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] DL capacity-aware fixes

While testing cpusets on asymmetric CPU capacity systems I realized that
the admission control, which kicks in when the cpumask of a cpuset is
about to be changed, is not capacity-aware. [PATCH 2/3] addresses this
issue.

Overview:

[PATCH 1/3] - Not part of the DL related changes but here for
              convenience : Inline helper function around
              static_branch_unlikely(&sched_asym_cpucapacity)

[PATCH 2/3] - Make dl_cpuset_cpumask_can_shrink() capacity-aware.

[PATCH 3/3] - Save a multiplication in dl_task_fits_capacity() by using
	      already maintained dl_density.

v1->v2:

[PATCH 3/3] - s/SCHED_CAPACITY_SHIFT/(BW_SHIFT - SCHED_CAPACITY_SHIFT)
	      (Vincent Guittot)

Dietmar Eggemann (3):
  sched: Introduce sched_asym_cpucap_active()
  sched/deadline: Make dl_cpuset_cpumask_can_shrink() capacity-aware
  sched/deadline: Use sched_dl_entity's dl_density in
    dl_task_fits_capacity()

 kernel/sched/cpudeadline.c |  2 +-
 kernel/sched/deadline.c    | 28 +++++++++++++---------------
 kernel/sched/fair.c        |  8 ++++----
 kernel/sched/rt.c          |  4 ++--
 kernel/sched/sched.h       | 35 ++++++++++++++++++++---------------
 5 files changed, 40 insertions(+), 37 deletions(-)

-- 
2.25.1