linux-kernel - [PATCH 0/2] nohz_full: Offload task_tick to remote housekeeping cpus for nohz

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Date:	Thu, 13 Aug 2015 14:55:36 +0530
From:	Vatika Harlalka <vatikaharlalka@...il.com>
To:	mingo@...hat.com, peterz@...radead.org, tglx@...utronix.de,
	rafael.j.wysocki@...el.com, fweisbec@...il.com,
	schwidefsky@...ibm.com, linux-kernel@...r.kernel.org,
	preetium@...rew.cmu.edu
Cc:	preeti.murthy@...il.com
Subject: [PATCH 0/2] nohz_full: Offload task_tick to remote housekeeping cpus
 for nohz_full cpus

This patchset is for offloading task_tick() to a remote housekeeping
cpu. The larger aim is to stop ticks on nohz_full cpus. For this, extra
work must be done by housekeeping cpus. So, task_tick is called from a
delayed workqueue for nohz_full cpus and the work is requeued every second
for those nohz_full cpus whose ticks are stopped while they are busy. In
the rest of the cases it will lead to redundant accounting. To facilitate
this, a new function tick_nohz_remote_tick_stopped is added to indicate
whether ticks are stopped on a remote cpu.
Tick related code in core.c is moved to tick.c

Vatika Harlalka (2):
  nohz_full: Move tick related code to tick.c
  nohz_full: Offload task_tick to remote housekeeping cpu

 include/linux/tick.h     |  2 ++
 kernel/sched/Makefile    |  2 +-
 kernel/sched/core.c      | 27 ---------------
 kernel/sched/tick.c      | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
 kernel/time/tick-sched.c |  5 +++
 5 files changed, 93 insertions(+), 28 deletions(-)
 create mode 100644 kernel/sched/tick.c

-- 
2.4.2

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