linux-kernel - [PATCH 0/6] sched/nohz: Make the rest of kcpustat vtime aware v2

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Message-Id: <20191119232218.4206-1-frederic@kernel.org>
Date:   Wed, 20 Nov 2019 00:22:12 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Rik van Riel <riel@...riel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yauheni Kaliuta <yauheni.kaliuta@...hat.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Pavel Machek <pavel@....cz>
Subject: [PATCH 0/6] sched/nohz: Make the rest of kcpustat vtime aware v2

(See https://lore.kernel.org/lkml/20191106030807.31091-1-frederic@kernel.org/
for the record)

After review from Peter, I eventually gave up with the idea of fixing
the nice fields of kcpustat. Therefore if a nice update happens on a
task while it runs on a nohz_full CPU, the whole cputime will be
accounted under the nice value observed at accounting time, hence the
possibility of a nice VS unnice kcpustat inacurrate distribution.

But that's a lesser evil compared to interrupting a nohz_full CPU, which
would be required to fix that. Also users of nohz_full shouldn't care
about nice at all since a single task is expected to run on the CPU.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	nohz/kcpustat-v4

HEAD: dd59f186dc21e164097f659b4d60815e232f9555

Thanks,
	Frederic
---

Frederic Weisbecker (6):
      sched/cputime: Support other fields on kcpustat_field()
      sched/vtime: Bring all-in-one kcpustat accessor for vtime fields
      procfs: Use all-in-one vtime aware kcpustat accessor
      cpufreq: Use vtime aware kcpustat accessors for user time
      leds: Use all-in-one vtime aware kcpustat accessor
      rackmeter: Use vtime aware kcpustat accessor


 drivers/cpufreq/cpufreq.c               |  13 ++-
 drivers/cpufreq/cpufreq_governor.c      |   6 +-
 drivers/leds/trigger/ledtrig-activity.c |   9 +-
 drivers/macintosh/rack-meter.c          |   7 +-
 fs/proc/stat.c                          |  20 ++--
 include/linux/kernel_stat.h             |  23 ++++
 kernel/sched/cputime.c                  | 192 ++++++++++++++++++++++++++------
 7 files changed, 216 insertions(+), 54 deletions(-)