linux-kernel - [GIT PULL] isolation: 1Hz residual tick offloading v3

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Date:   Thu,  4 Jan 2018 05:25:32 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        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>,
        Wanpeng Li <kernellwp@...il.com>,
        Mike Galbraith <efault@....de>, Rik van Riel <riel@...hat.com>
Subject: [GIT PULL] isolation: 1Hz residual tick offloading v3  

Ingo,

Please pull the sched/0hz branch that can be found at:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	sched/0hz

HEAD: 9e932b2cc707209febd130978a5eb9f4a943a3f4

--
Now that scheduler_tick() has become resilient towards the absence of
ticks, current->sched_class->task_tick() is the last piece that needs
at least 1Hz tick to keep scheduler stats alive.

This patchset adds a flag to the isolcpus boot option to offload the
residual 1Hz tick. This way the nohz_full CPUs don't have anymore tick
(assuming nothing else requires it) as their residual 1Hz tick is
offloaded to the housekeepers.

For quick testing, say on CPUs 1-7:

	"isolcpus=nohz_offload,domain,1-7"

Thanks,
	Frederic
---

Frederic Weisbecker (5):
      sched: Rename init_rq_hrtick to hrtick_rq_init
      sched/isolation: Add scheduler tick offloading interface
      nohz: Allow to check if remote CPU tick is stopped
      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 +-
 include/linux/tick.h                            |  2 +
 kernel/sched/core.c                             | 94 +++++++++++++++++++++++--
 kernel/sched/isolation.c                        | 10 +++
 kernel/sched/sched.h                            |  2 +
 kernel/time/tick-sched.c                        |  7 ++
 7 files changed, 117 insertions(+), 8 deletions(-)