Messages in this thread | | | Date | Tue, 4 Jan 2022 16:17:23 -0800 | From | "Paul E. McKenney" <> | Subject | [GIT PULL clocksource] Clocksource watchdog commits for v5.17 |
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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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