From: Julia Cartwright <julia@ni.com>
To: Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>,
Guenter Roeck <linux@roeck-us.net>,
Steffen Trumtrar <s.trumtrar@pengutronix.de>,
Tim Sander <tim@krieglstein.org>
Subject: [PATCH 0/2] Fix watchdogd wakeup deferral on RT
Date: Fri, 28 Sep 2018 21:03:52 +0000 [thread overview]
Message-ID: <cover.1538089179.git.julia@ni.com> (raw)
In-Reply-To: <73in2vl5mj.fsf@pengutronix.de>
The following two patches solve an issue reported by Steffen Trumtrar
and Tim Sander to the linux-rt-users mailing list. Namely, the wakeup
of the watchdogd thread being starved by an RT task due to the hrtimer
deferral through ktimersoftd (on PREEMPT_RT_FULL).
The first patch adjusts the kthread_worker locking to make use of a raw
spinlock, making it suitable for work item queueing from hardirq context
on PREEMPT_RT. This patch can be applied directly to mainline without
any functional change.
The second patch adjusts the hrtimer used by the watchdog core to be a
_HARD timer (and thus not deferred through ktimersoftd w/ PREEMPT_RT).
This patch depends on hrtimer patches carried in the RT patch, and so
should therefore land there.
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Cc: Tim Sander <tim@krieglstein.org>
Julia Cartwright (2):
kthread: convert worker lock to raw spinlock
watchdog, rt: prevent deferral of watchdogd wakeup
drivers/watchdog/watchdog_dev.c | 2 +-
include/linux/kthread.h | 2 +-
kernel/kthread.c | 42 ++++++++++++++++-----------------
3 files changed, 23 insertions(+), 23 deletions(-)
--
2.18.0
next parent reply other threads:[~2018-09-28 21:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <73in2vl5mj.fsf@pengutronix.de>
2018-09-28 21:03 ` Julia Cartwright [this message]
2018-09-28 21:03 ` [PATCH 1/2] kthread: convert worker lock to raw spinlock Julia Cartwright
2018-10-05 16:46 ` Sebastian Andrzej Siewior
2018-10-05 18:10 ` Andrea Parri
2018-10-09 10:56 ` Sebastian Andrzej Siewior
2018-09-28 21:03 ` [PATCH RT 2/2] watchdog, rt: prevent deferral of watchdogd wakeup Julia Cartwright
2018-09-28 22:38 ` kbuild test robot
2018-09-29 6:38 ` Thomas Gleixner
2018-09-29 22:13 ` Sebastian Andrzej Siewior
2018-09-30 1:41 ` [kbuild-all] " Li, Philip
2018-09-28 23:20 ` kbuild test robot
2018-09-30 14:00 ` Guenter Roeck
2018-10-05 16:52 ` Sebastian Andrzej Siewior
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