linux-kernel - [PATCH v6 0/4] sched/fair: Fix attach and detach sched avgs for task group change and sched class change

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Message-Id: <1465942870-28419-1-git-send-email-yuyang.du@intel.com>
Date:	Wed, 15 Jun 2016 06:21:06 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	peterz@...radead.org, mingo@...nel.org,
	linux-kernel@...r.kernel.org
Cc:	umgwanakikbuti@...il.com, bsegall@...gle.com, pjt@...gle.com,
	morten.rasmussen@....com, vincent.guittot@...aro.org,
	dietmar.eggemann@....com, matt@...eblueprint.co.uk,
	Yuyang Du <yuyang.du@...el.com>
Subject: [PATCH v6 0/4] sched/fair: Fix attach and detach sched avgs for task group change and sched class change

Hi Peter,

The attach/detach twice problem is worse than Vincent reported.

The attach twice issue can happen not only as Vincent raised when task moves
between groups, but also when switching to fair class. In addition, for newly
forked task, the detach also has a problem. This patchset attempts to address
all of those problems.

Thanks a lot to Vincent and Peter. This new version addresses their comments
to reword the changelog and comments. Also thanks to Matt for the suggestion
to fix the newly forked task's detach problem easier.

This version also incorporates Peter's suggestion to unify the 'new' task test
in vruntime_normalized(), detach_entity_load_avg(), and remove_entity_load_avg().

Thanks,
Yuyang

--

Yuyang Du (4):
  sched/fair: Fix attaching task sched avgs twice when switching to
    fair or changing task group
  sched/fair: Move load and util avgs from wake_up_new_task() to
    sched_fork()
  sched/fair: Skip detach sched avgs for new task when changing task
    groups
  sched/fair: Add inline to detach_entity_load_evg()

 kernel/sched/core.c  |    5 +--
 kernel/sched/fair.c  |   98 +++++++++++++++++++++++++++++---------------------
 kernel/sched/sched.h |    2 +-
 3 files changed, 62 insertions(+), 43 deletions(-)

-- 
1.7.9.5