linux-kernel - [PATCH v2 0/3] sched/fair: Reduce contention on tg's load

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Date:	Wed,  2 Dec 2015 13:41:47 -0500
From:	Waiman Long <Waiman.Long@....com>
To:	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, Yuyang Du <yuyang.du@...el.com>,
	Paul Turner <pjt@...gle.com>, Ben Segall <bsegall@...gle.com>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>,
	Waiman Long <Waiman.Long@....com>
Subject: [PATCH v2 0/3] sched/fair: Reduce contention on tg's load_avg

v1->v2:
 - Make a memcache for task_group to make sure that the allocated
   task_group object will always be on cacheline boundary even if
   debugging is turned on.
 - Scrap the original patch 3 and replace it with another one to
   disable load_avg update for root_task_group.

This patch series tries to reduce contention on task_group's load_avg
to improve system performance. It also tries to optimize the use of
idle_cpu() call in update_sg_lb_stats().

Waiman Long (3):
  sched/fair: Avoid redundant idle_cpu() call in update_sg_lb_stats()
  sched/fair: Move hot load_avg into its own cacheline
  sched/fair: Disable tg load_avg update for root_task_group

 kernel/sched/core.c  |   36 ++++++++++++++++++++++++++++++++++--
 kernel/sched/fair.c  |   16 +++++++++++++---
 kernel/sched/sched.h |    7 ++++++-
 3 files changed, 53 insertions(+), 6 deletions(-)

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