linux-kernel - [RFC PATCH 0/5] isolation: 1Hz residual tick offloading

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Message-Id: <1513653838-31314-1-git-send-email-frederic@kernel.org>
Date:   Tue, 19 Dec 2017 04:23:53 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Luiz Capitulino <lcapitulino@...hat.com>,
        Christoph Lameter <cl@...ux.com>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Wanpeng Li <kernellwp@...il.com>,
        Mike Galbraith <efault@....de>, Rik van Riel <riel@...hat.com>
Subject: [RFC PATCH 0/5] isolation: 1Hz residual tick offloading

Finally! It has been years since I had to do that but I kept knocking
against prerequisites, mostly about making scheduler_tick() resilient
against the absence of ticks. Now it seems that current->sched_class->task_tick()
is the last piece of it.

This patchset adds a flag to the isolcpus boot option to offload the
residual 1Hz tick.

For quick testing, say on CPUs 1-7:

	"isolcpus=nohz_offload,domain,1-7"

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	timers/0z

HEAD: a9366794579a4ff71ec3546b9983536a669fbfb9

Thanks,
	Frederic
---

Frederic Weisbecker (5):
      sched: Move tick code to a separate file
      sched: Rename init_rq_hrtick to hrtick_rq_init
      sched/isolation: Add scheduler tick offloading interface
      sched/isolation: Residual 1Hz scheduler tick offload
      sched/isolation: Document "nohz_offload" flag


 Documentation/admin-guide/kernel-parameters.txt |   7 +-
 include/linux/sched/isolation.h                 |   3 +-
 kernel/sched/Makefile                           |   2 +-
 kernel/sched/core.c                             | 186 +-----------------
 kernel/sched/isolation.c                        |  10 +
 kernel/sched/sched.h                            |  13 +-
 kernel/sched/tick.c                             | 250 ++++++++++++++++++++++++
 7 files changed, 284 insertions(+), 187 deletions(-)