linux-kernel - [PATCH 0/5] sched/deadline: Fix double accounting in push_dl

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Message-Id: <20190726082756.5525-1-dietmar.eggemann@arm.com>
Date:   Fri, 26 Jul 2019 09:27:51 +0100
From:   Dietmar Eggemann <dietmar.eggemann@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Juri Lelli <juri.lelli@...hat.com>
Cc:     Luca Abeni <luca.abeni@...tannapisa.it>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <Valentin.Schneider@....com>,
        Qais Yousef <Qais.Yousef@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] sched/deadline: Fix double accounting in push_dl_task() & some cleanups

While running a simple DL workload (1 DL (12000, 100000, 100000) task
per CPU) on Arm64 & x86 systems I noticed that some of the
SCHED_WARN_ON() in the rq/running bandwidth (bw) functions trigger.
Patch 1/5 contains a proposal to fix this.

Patch 2-5/5 contain various smaller cleanups I discovered while
debugging the actual issue.

Dietmar Eggemann (5):
  sched/deadline: Fix double accounting of rq/running bw in
    push_dl_task()
  sched/deadline: Remove unused int flags from __dequeue_task_dl()
  sched/deadline: Use __sub_running_bw() throughout
    dl_change_utilization()
  sched/deadline: Cleanup on_dl_rq() handling
  sched/deadline: Use return value of SCHED_WARN_ON() in bw accounting

 kernel/sched/deadline.c | 28 ++++++++++------------------
 1 file changed, 10 insertions(+), 18 deletions(-)

-- 
2.17.1