linux-kernel - [PATCH 0/3] sched: Task priority related cleanups

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Date:   Thu, 28 Jan 2021 14:10:37 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jeremy Kerr <jk@...abs.org>, Arnd Bergmann <arnd@...db.de>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Hillf Danton <hdanton@...a.com>, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 0/3] sched: Task priority related cleanups

(1) Removing MAX_USER_RT_PRIO was already discussed here in April 2020:

    https://lkml.kernel.org/r/20200423094403.6f1d2b8d@gandalf.local.home

(2) USER_PRIO() and related macros are not used anymore except in one
    case for powerpc where MAX_USER_PRIO can be replaced by NICE_WIDTH.
    Set_load_weight(), task_prio(), cpu_weight_nice_write_s64(),
    __update_max_tr() don't use USER_PRIO() but priority - MAX_RT_PRIO.

(3) The function header of task_prio() needs an update. It looks
    ancient since it mentions a prio space [-16 ... 15] for mormal
    tasks. I can't figure out why this range is mentioned here? Maybe
    the influence of the 'sleep-bonus interactivity' feature which was
    removed by commit f3479f10c5d6 ("sched: remove the sleep-bonus
    interactivity code")? 

Dietmar Eggemann (3):
  sched: Remove MAX_USER_RT_PRIO
  sched: Remove USER_PRIO, TASK_USER_PRIO and MAX_USER_PRIO
  sched/core: Update task_prio() function header

 arch/powerpc/platforms/cell/spufs/sched.c |  2 +-
 include/linux/sched/prio.h                | 18 +-----------------
 kernel/sched/core.c                       | 15 +++++++++------
 kernel/sched/sched.h                      |  2 +-
 4 files changed, 12 insertions(+), 25 deletions(-)

-- 
2.25.1