From: Don Zickus on gitlab.com
Merge Request: https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2963
NOTE: Truncated patchset since committer email 'bige...@linutronix.de'
does not match the submitter's GitLab public email address
'dzic...@redhat.com'.
ksoftirqd is statically boosted to the priority level right above the
one of rcu_torture_boost() so that timers, which torture readers rely on,
get a chance to run while rcu_torture_boost() is polling.
However timers processing got split from ksoftirqd into their own kthread
(timersd) that isn't boosted. It has the same SCHED_FIFO low prio as
rcu_torture_boost() and therefore timers can't preempt it and may
starve.
The issue can be triggered in practice on v5.17.1-rt17 using:
./kvm.sh --allcpus --configs TREE04 --duration 10m --kconfig
"CONFIG_EXPERT=y CONFIG_PREEMPT_RT=y"
Fix this with statically boosting timersd just like is done with
ksoftirqd in commit
ea6d962e80b61 ("rcutorture: Judge RCU priority boosting on grace periods,
not callbacks")
Suggested-by: Mel Gorman <mgor...@suse.de>
Cc: Sebastian Andrzej Siewior <bige...@linutronix.de>
Cc: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: Frederic Weisbecker <frede...@kernel.org>
Link: https://lkml.kernel.org/r/20220405010752.1347437-1-frede...@kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
Documentation/admin-guide/kernel-parameters.txt | 12 +
arch/arm/mm/fault.c | 6 +
arch/arm/vfp/vfpmodule.c | 74 +-
arch/arm/Kconfig | 6 +-
arch/arm64/Kconfig | 1 +
arch/powerpc/include/asm/stackprotector.h | 7 +-
arch/powerpc/kernel/traps.c | 7 +-
arch/powerpc/kvm/Kconfig | 1 +
arch/powerpc/platforms/pseries/Kconfig | 1 +
arch/powerpc/platforms/pseries/iommu.c | 31 +-
arch/powerpc/Kconfig | 2 +
arch/riscv/include/asm/thread_info.h | 2 +
arch/riscv/Kconfig | 2 +
arch/x86/include/asm/thread_info.h | 6 +-
arch/x86/Kconfig | 3 +
drivers/acpi/processor_idle.c | 2 +-
drivers/block/zram/zram_drv.c | 37 +
drivers/block/zram/zram_drv.h | 3 +
drivers/gpu/drm/i915/display/intel_crtc.c | 15 +-
drivers/gpu/drm/i915/display/intel_vblank.c | 38 +-
drivers/gpu/drm/i915/gt/uc/intel_guc.h | 2 +-
drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 5 +-
drivers/gpu/drm/i915/gt/intel_execlists_submission.c | 17 +-
drivers/gpu/drm/i915/Kconfig | 1 -
drivers/gpu/drm/i915/i915_request.c | 2 -
drivers/gpu/drm/i915/i915_trace.h | 6 +-
drivers/gpu/drm/i915/i915_utils.h | 2 +-
drivers/tty/serial/8250/8250_core.c | 42 +-
drivers/tty/serial/8250/8250_port.c | 160 +++-
drivers/tty/serial/amba-pl011.c | 12 +-
drivers/tty/serial/omap-serial.c | 12 +-
drivers/tty/tty_io.c | 9 +-
fs/proc/consoles.c | 14 +-
include/linux/sched/idle.h | 8 +-
include/linux/bottom_half.h | 2 +
include/linux/console.h | 127 ++-
include/linux/entry-common.h | 2 +-
include/linux/entry-kvm.h | 2 +-
include/linux/interrupt.h | 29 +
include/linux/netdevice.h | 4 +
include/linux/printk.h | 32 +-
include/linux/sched.h | 13 +-
include/linux/serial_8250.h | 6 +
include/linux/serial_core.h | 31 +-
include/linux/thread_info.h | 24 +
include/linux/trace_events.h | 8 +-
kernel/entry/common.c | 4 +-
kernel/entry/kvm.c | 2 +-
kernel/locking/lockdep.c | 5 +
kernel/printk/internal.h | 98 +
kernel/printk/nbcon.c | 732 +++++++++++++-
kernel/printk/printk.c | 675 ++++++++++--
kernel/printk/printk_ringbuffer.c | 335 +++++-
kernel/printk/printk_ringbuffer.h | 54 +-
kernel/printk/printk_safe.c | 12 +
kernel/rcu/rcutorture.c | 6 +
kernel/rcu/tree_stall.h | 5 +
kernel/sched/core.c | 65 +-
kernel/sched/debug.c | 19 +
kernel/sched/fair.c | 46 +-
kernel/sched/features.h | 2 +
kernel/sched/idle.c | 3 +-
kernel/sched/rt.c | 5 +-
kernel/sched/sched.h | 1 +
kernel/time/hrtimer.c | 4 +-
kernel/time/tick-sched.c | 2 +-
kernel/time/timer.c | 11 +-
kernel/trace/trace.c | 2 +
kernel/trace/trace_output.c | 16 +-
kernel/Kconfig.preempt | 17 +-
kernel/ksysfs.c | 12 +
kernel/panic.c | 17 +
kernel/softirq.c | 95 +-
lib/dump_stack.c | 16 +-
net/core/dev.c | 39 +-
net/core/skbuff.c | 7 +-
redhat/configs/pending-fedora/generic/CONFIG_PREEMPT_AUTO | 15 +
redhat/configs/pending-fedora/generic/CONFIG_PREEMPT_RT | 15 +
redhat/configs/rhel/generic/CONFIG_PREEMPT_AUTO | 1 +
redhat/configs/rhel/generic/CONFIG_PREEMPT_RT | 1 +
redhat/configs/rhel/rt/debug/CONFIG_PREEMPT_VOLUNTARY | 1 -
redhat/configs/rhel/rt/generic/CONFIG_PREEMPT_DYNAMIC | 2 +-
redhat/configs/rhel/rt/generic/CONFIG_PREEMPT_RT | 2 +-
redhat/configs/rhel/rt/generic/CONFIG_PREEMPT_VOLUNTARY | 2 +-
localversion-rt | 1 +
85 files changed, 2740 insertions(+), 435 deletions(-)
--
_______________________________________________
kernel mailing list -- kernel@lists.fedoraproject.org
To unsubscribe send an email to kernel-le...@lists.fedoraproject.org
Fedora Code of Conduct:
https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives:
https://lists.fedoraproject.org/archives/list/kernel@lists.fedoraproject.org
Do not reply to spam, report it:
https://pagure.io/fedora-infrastructure/new_issue
