linux-kernel - Re: [GIT PULL] nohz: Move nohz kick out of scheduler IPI, v9

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Date:	Wed, 18 Jun 2014 18:48:41 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kevin Hilman <khilman@...aro.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [GIT PULL] nohz: Move nohz kick out of scheduler IPI, v9


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> Ingo,
> 
> Please pull the timers/nohz-irq-work-v7 branch that can be found at:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> 	timers/nohz-irq-work-v7
> 
> It has been acked by Peterz.
> 
> --- Summary ---
> 
> This set moves the nohz kick, used to notify a full dynticks CPU when
> events require tick rescheduling, out of the scheduler tick to a
> dedicated IPI.
> 
> This debloats a bit the scheduler IPI from off-topic work that was
> abusing that scheduler fast path for its convenient asynchronous
> properties. Now the nohz kick uses irq work for its own needs.
> 
> Of course this implied quite some background infrastructure rework,
> including:
> 
> * Clean up some irq work internals
> * Implement remote irq work
> * Implement nohz kick on top of remote irq work
> * Move full dynticks timer enqueue notification to new kick
> * Move multi-task notification to new kick
> * Remove unecessary barriers on multi-task notification
> 
> Thanks,
> 	Frederic
> ---
> 
> Frederic Weisbecker (6):
>       irq_work: Split raised and lazy lists
>       irq_work: Implement remote queueing
>       nohz: Support nohz full remote kick
>       nohz: Switch to nohz full remote kick on timer enqueue
>       nohz: Use nohz own full kick on 2nd task enqueue
>       nohz: Use IPI implicit full barrier against rq->nr_running r/w
> 
> 
>  include/linux/irq_work.h |  5 ++++
>  include/linux/tick.h     |  9 +++++-
>  kernel/irq_work.c        | 76 ++++++++++++++++++++++++++++++------------------
>  kernel/sched/core.c      | 22 ++++++++------
>  kernel/sched/sched.h     | 12 ++++++--
>  kernel/smp.c             |  9 ++++++
>  kernel/time/tick-sched.c | 10 ++++---
>  7 files changed, 97 insertions(+), 46 deletions(-)

Pulled, thanks a lot Frederic!

	Ingo
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