From: Waiman Long <longman@redhat.com>
To: John Stultz <john.stultz@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
Stephen Boyd <sboyd@kernel.org>
Cc: linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Cassio Neri <cassio.neri@gmail.com>,
Linus Walleij <linus.walleij@linaro.org>,
Colin Ian King <colin.king@canonical.com>,
Frederic Weisbecker <frederic@kernel.org>,
Feng Tang <feng.tang@intel.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Waiman Long <longman@redhat.com>
Subject: [PATCH 0/2] clocksource: Avoid incorrect hpet fallback
Date: Wed, 10 Nov 2021 17:17:30 -0500 [thread overview]
Message-ID: <20211110221732.272986-1-longman@redhat.com> (raw)
It was found that when an x86 system was being stressed by running
various different benchmark suites, the clocksource watchdog might
occasionally mark TSC as unstable and fall back to hpet which will
have a signficant impact on system performance.
The current watchdog clocksource skew threshold of 50us is found to be
insufficient. So it is changed back to 100us before commit 2e27e793e280
("clocksource: Reduce clocksource-skew threshold") in patch 1. Patch 2
adds a Kconfig option to allow kernel builder to control the actual
threshold to be used.
Waiman Long (2):
clocksource: Avoid accidental unstable marking of clocksources
clocksource: Add a Kconfig option for WATCHDOG_MAX_SKEW
kernel/time/Kconfig | 9 ++++++
kernel/time/clocksource.c | 58 ++++++++++++++++++++++++++++++---------
2 files changed, 54 insertions(+), 13 deletions(-)
--
2.27.0
next reply other threads:[~2021-11-10 22:18 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-10 22:17 Waiman Long [this message]
2021-11-10 22:17 ` [PATCH 1/2] clocksource: Avoid accidental unstable marking of clocksources Waiman Long
2021-11-11 4:57 ` Feng Tang
2021-11-11 14:43 ` Paul E. McKenney
2021-11-12 5:44 ` Feng Tang
2021-11-12 13:47 ` Paul E. McKenney
2021-11-13 3:43 ` Waiman Long
2021-11-14 15:54 ` Paul E. McKenney
2021-11-15 2:08 ` Feng Tang
2021-11-15 3:24 ` Waiman Long
2021-11-15 7:59 ` Feng Tang
2021-11-15 14:07 ` Paul E. McKenney
2021-11-16 1:36 ` Feng Tang
2021-11-16 20:36 ` Paul E. McKenney
2021-11-15 19:19 ` Waiman Long
2021-11-10 22:17 ` [PATCH 2/2] clocksource: Add a Kconfig option for WATCHDOG_MAX_SKEW Waiman Long
2021-11-10 22:32 ` [PATCH 0/2] clocksource: Avoid incorrect hpet fallback Paul E. McKenney
2021-11-10 23:25 ` Waiman Long
2021-11-11 0:04 ` Paul E. McKenney
2021-11-11 1:19 ` Waiman Long
2021-11-11 1:23 ` Feng Tang
2021-11-11 1:30 ` Waiman Long
2021-11-11 1:53 ` Feng Tang
2021-11-11 3:07 ` Paul E. McKenney
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