From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Anna-Maria Behnsen <anna-maria@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
Frederic Weisbecker <frederic@kernel.org>,
Peter Xu <peterx@redhat.com>,
Nitesh Narayan Lal <nitesh@redhat.com>,
Alex Belits <abelits@marvell.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
John Stultz <john.stultz@linaro.org>
Subject: [patch 0/8] hrtimers: Overhaul the clock_was_set() logic
Date: Tue, 27 Apr 2021 10:25:37 +0200 [thread overview]
Message-ID: <20210427082537.611978720@linutronix.de> (raw)
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(-)
next reply other threads:[~2021-04-27 8:38 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-27 8:25 Thomas Gleixner [this message]
2021-04-27 8:25 ` [patch 1/8] hrtimer: Ensure timerfd notification for HIGHRES=n Thomas Gleixner
2021-04-27 8:25 ` [patch 2/8] hrtimer: Force clock_was_set() handling for the HIGHRES=n, NOHZ=y case Thomas Gleixner
2021-05-12 14:59 ` Peter Zijlstra
2021-05-12 16:40 ` Thomas Gleixner
2021-04-27 8:25 ` [patch 3/8] timerfd: Provide timerfd_resume() Thomas Gleixner
2021-04-27 8:25 ` [patch 4/8] timekeeping: Distangle resume and clock-was-set events Thomas Gleixner
2021-04-27 8:25 ` [patch 5/8] time/timekeeping: Avoid invoking clock_was_set() twice Thomas Gleixner
2021-04-27 8:25 ` [patch 6/8] hrtimer: Add bases argument to clock_was_set() Thomas Gleixner
2021-04-27 8:25 ` [patch 7/8] hrtimer: Avoid unnecessary SMP function calls in clock_was_set() Thomas Gleixner
2021-05-13 14:59 ` Peter Zijlstra
2021-05-14 18:52 ` Thomas Gleixner
2021-05-14 23:28 ` Peter Zijlstra
2021-05-15 0:24 ` Thomas Gleixner
2021-04-27 8:25 ` [patch 8/8] hrtimer: Avoid more " Thomas Gleixner
2021-04-27 15:11 ` Marcelo Tosatti
2021-04-27 19:59 ` Thomas Gleixner
2021-04-30 7:12 ` [patch V2 " Thomas Gleixner
2021-04-30 16:49 ` Marcelo Tosatti
2021-05-13 7:47 ` Peter Zijlstra
2021-05-14 19:08 ` Thomas Gleixner
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