linux-kernel - [RFC PATCH 0/2] sched/eevdf: Rate limit task migration

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Message-Id: <20230905171105.1005672-1-mathieu.desnoyers@efficios.com>
Date:   Tue,  5 Sep 2023 13:11:03 -0400
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Ingo Molnar <mingo@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Swapnil Sapkal <Swapnil.Sapkal@....com>,
        Aaron Lu <aaron.lu@...el.com>,
        Julien Desfossez <jdesfossez@...italocean.com>, x86@...nel.org
Subject: [RFC PATCH 0/2] sched/eevdf: Rate limit task migration

Implement task migration rate limiting to speed up workload patterns
such as hackbench which trigger frequent migrations.

The first patch implements a simple rate limiting of 1 migration per
2ms. The second patch implements adaptative task migration rate
limiting.

I would be interested to hear feedback on this approach, especially
about how it behaves on various workloads.

Thanks,

Mathieu

Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Valentin Schneider <vschneid@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ben Segall <bsegall@...gle.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Daniel Bristot de Oliveira <bristot@...hat.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Swapnil Sapkal <Swapnil.Sapkal@....com>
Cc: Aaron Lu <aaron.lu@...el.com>
Cc: Julien Desfossez <jdesfossez@...italocean.com>
Cc: x86@...nel.org

Mathieu Desnoyers (2):
  sched: rate limit migrations to 1 per 2ms per task
  sched: Implement adaptative rate limiting of task migrations

 include/linux/sched.h |  4 ++++
 kernel/sched/core.c   |  3 +++
 kernel/sched/fair.c   | 40 ++++++++++++++++++++++++++++++++++++++++
 kernel/sched/sched.h  |  4 ++++
 4 files changed, 51 insertions(+)

-- 
2.39.2