linux-kernel - [patch V2 00/10] hrtimer: Reprogramming and clock_was

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Date:   Tue, 13 Jul 2021 15:39:45 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>
Subject: [patch V2 00/10] hrtimer: Reprogramming and clock_was_set() overhaul

Folks!

This is the second version of the clock_was_set() overhaul together with
the avoidance of double reprogramming when rearming an enqueued timer.

Version 1 of those patches can be found here:

   https://lore.kernel.org/r/20210427082537.611978720@linutronix.de
and
   https://lore.kernel.org/r/87v989topu.ffs@nanos.tec.linutronix.de

Both the reprogramming logic and the clock_was_set() logic are not really
optimized. The series addresses this.

  - Avoid double reprogramming when an enqueued timer is rearmed

  - Consolidate the reprogramming variants (Peter Zijlstra)

  - Fix the cases where the clock_was_set() handling is incorrect depending
    on configuration or runtime conditions.

  - Distangle the resume notification and the clock-was-set mechanism to
    prepare for IPI avoidance

  - Adopt Marcelo's patch to the modified code and add some more smarts on
    top.

The series is also available from git:

  git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git hrtimer

Changes vs V1:

  - Pick up Peter's consolidation patch
  - Polish a few things

Thanks,

	tglx
---
 fs/timerfd.c                |   16 ++
 include/linux/hrtimer.h     |    8 -
 kernel/time/hrtimer.c       |  337 +++++++++++++++++++++++++++++++-------------
 kernel/time/tick-common.c   |    7 
 kernel/time/tick-internal.h |   12 +
 kernel/time/timekeeping.c   |   36 ++--
 6 files changed, 299 insertions(+), 117 deletions(-)