linux-kernel - [patch 0/8] hrtimers: Overhaul the clock_was

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Message-Id: <20210427082537.611978720@linutronix.de>
Date:   Tue, 27 Apr 2021 10:25:37 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Anna-Maria Behnsen <anna-maria@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Peter Xu <peterx@...hat.com>,
        Nitesh Narayan Lal <nitesh@...hat.com>,
        Alex Belits <abelits@...vell.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        John Stultz <john.stultz@...aro.org>
Subject: [patch 0/8] hrtimers: Overhaul the clock_was_set() logic

A recent patch from Marcelo to avoid IPIs when the clock was set

  https://lore.kernel.org/r/20210407135301.GA16985@fuller.cnet

made me look deeper into this.

That mechanism has caught some dust and bitrot over time and just making
clock_was_set() a little bit smarter does not make the code any better.

The following series addresses this by:

 - Fixing 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

Thanks,

	tglx
---
 fs/timerfd.c                |   16 +++
 include/linux/hrtimer.h     |    8 -
 kernel/time/hrtimer.c       |  217 ++++++++++++++++++++++++++++++++------------
 kernel/time/tick-common.c   |    7 +
 kernel/time/tick-internal.h |   12 ++
 kernel/time/timekeeping.c   |   36 ++++---
 6 files changed, 219 insertions(+), 77 deletions(-)