Hi,
So here is a proposition on what we can do to make printk
correctly working on a tickless CPU.
Although it's targeted to be part of the adaptive tickmess
implemetation, it's pretty standalone and generic and also
works for printk() calls in idle.
It is based on latest linus tree.
Waiting for your comments.
Thanks.
PS: only built-tested for now.
Frederic Weisbecker (5):
irq_work: Move irq_work_raise() declaration/default definition to
arch headers
irq_work: Only run irq_work from tick if arch needs it
x86: Implement arch_irq_work_use_tick
nohz: Add API to check tick state
printk: Wake up klogd with irq_work on nohz CPU
arch/alpha/include/asm/irq_work.h | 9 +++++++
arch/alpha/kernel/time.c | 2 +-
arch/arm/include/asm/irq_work.h | 1 +
arch/arm64/include/asm/irq_work.h | 1 +
arch/blackfin/include/asm/irq_work.h | 1 +
arch/frv/include/asm/irq_work.h | 1 +
arch/hexagon/include/asm/irq_work.h | 1 +
arch/mips/include/asm/irq_work.h | 1 +
arch/parisc/include/asm/irq_work.h | 1 +
arch/powerpc/include/asm/irq_work.h | 8 ++++++
arch/powerpc/kernel/time.c | 2 +-
arch/s390/include/asm/irq_work.h | 1 +
arch/sh/include/asm/irq_work.h | 1 +
arch/sparc/include/asm/irq_work.h | 8 ++++++
arch/sparc/kernel/pcr.c | 2 +-
arch/x86/include/asm/irq_work.h | 15 ++++++++++++
arch/x86/kernel/irq_work.c | 6 ++--
include/asm-generic/irq_work.h | 22 +++++++++++++++++
include/linux/irq_work.h | 1 +
include/linux/tick.h | 16 ++++++++++++-
kernel/irq_work.c | 7 -----
kernel/printk.c | 42 ++++++++++++++++++++++++++++++++++
kernel/time/tick-sched.c | 2 +-
kernel/timer.c | 2 +-
24 files changed, 137 insertions(+), 16 deletions(-)
create mode 100644 arch/alpha/include/asm/irq_work.h
create mode 100644 arch/arm/include/asm/irq_work.h
create mode 100644 arch/arm64/include/asm/irq_work.h
create mode 100644 arch/blackfin/include/asm/irq_work.h
create mode 100644 arch/frv/include/asm/irq_work.h
create mode 100644 arch/hexagon/include/asm/irq_work.h
create mode 100644 arch/mips/include/asm/irq_work.h
create mode 100644 arch/parisc/include/asm/irq_work.h
create mode 100644 arch/powerpc/include/asm/irq_work.h
create mode 100644 arch/s390/include/asm/irq_work.h
create mode 100644 arch/sh/include/asm/irq_work.h
create mode 100644 arch/sparc/include/asm/irq_work.h
create mode 100644 arch/x86/include/asm/irq_work.h
create mode 100644 include/asm-generic/irq_work.h
--
1.7.5.4
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