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Message-ID: <20220105001723.GA536708@paulmck-ThinkPad-P17-Gen-1>
Date: Tue, 4 Jan 2022 16:17:23 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: tglx@...utronix.de
Cc: longman@...hat.com, feng.tang@...el.com,
linux-kernel@...r.kernel.org
Subject: [GIT PULL clocksource] Clocksource watchdog commits for v5.17
Hello, Thomas,
This pull request contains a pair of changes, both courtesy of Waiman
Long:
1. Avoids accidental unstable marking of clocksources by rejecting
clocksource measurements where the source of the skew is the delay
reading reference clocksource itself. This change avoids many
of the current false positives caused by epic cache-thrashing
workloads.
https://lore.kernel.org/lkml/20211118191439.1000012-2-longman@redhat.com/
2. Reduces the default clocksource_watchdog() retries to 2, thus
offsetting the increased overhead due to #1 above rereading the
reference clocksource.
https://lore.kernel.org/lkml/20211118191439.1000012-3-longman@redhat.com/
These have been subjected to the kbuild test robot and -next testing,
and are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git clocksource
for you to fetch changes up to 1a5620671a1b6fd9cc08761677d050f1702f910c:
clocksource: Reduce the default clocksource_watchdog() retries to 2 (2021-11-30 17:22:29 -0800)
----------------------------------------------------------------
Waiman Long (2):
clocksource: Avoid accidental unstable marking of clocksources
clocksource: Reduce the default clocksource_watchdog() retries to 2
Documentation/admin-guide/kernel-parameters.txt | 4 +-
kernel/time/clocksource.c | 52 ++++++++++++++++++++-----
2 files changed, 44 insertions(+), 12 deletions(-)
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