linux-kernel - [PATCH v4 0/2] sched/fair: update scale invariance of PELT

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Date:   Fri, 19 Oct 2018 18:17:49 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     rjw@...ysocki.net, dietmar.eggemann@....com,
        Morten.Rasmussen@....com, patrick.bellasi@....com, pjt@...gle.com,
        bsegall@...gle.com, thara.gopinath@...aro.org,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH v4 0/2]  sched/fair: update scale invariance of PELT

This 4th version of the scale invariance patchset adds an important change
compare to previous ones. It still scales the time to reflect the
amount of work that has been done during the elapsed running time but this is
now done at rq level instead of per entity and rt/dl/cfs_rq. The main
advantage is that it is done once per clock update and we don't need to
maintain per sched_avg's stolen_idle_time anymore. This also ensure that
all the pelt signal will be always synced for a rq.

The 1st patch makes available rq_of() helper function for pelt.c file and
the 2nd patch implements the new scaling algorithm

Vincent Guittot (2):
  sched/fair: move rq_of helper function
  sched/fair: update scale invariance of PELT

 kernel/sched/core.c     |  2 +-
 kernel/sched/deadline.c |  6 ++--
 kernel/sched/fair.c     | 29 +++++-----------
 kernel/sched/pelt.c     | 88 ++++++++++++++++++++++++++++++++++++++++++++-----
 kernel/sched/pelt.h     | 27 +++++++++++++++
 kernel/sched/rt.c       |  6 ++--
 kernel/sched/sched.h    | 18 ++++++++++
 7 files changed, 139 insertions(+), 37 deletions(-)

-- 
2.7.4