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time: Move CONTEXT_TRACKING to kernel/time/Kconfig

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Both CONTEXT_TRACKING and CONTEXT_TRACKING_FORCE are currently defined
in kernel/rcu/kconfig, which might have made sense at some point, but
no longer does given that RCU refers to neither of these Kconfig options.

Therefore move them to kernel/time/Kconfig, where the rest of the
NO_HZ_FULL Kconfig options live.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: https://lkml.kernel.org/r/20181220170525.GA12579@linux.ibm.com
This commit is contained in:
Paul E. McKenney 2018-12-20 09:05:25 -08:00 committed by Thomas Gleixner
parent 1c7fc5cbc3
commit a4cffdad73
2 changed files with 29 additions and 30 deletions
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30
kernel/rcu/Kconfig
View File

@ -87,36 +87,6 @@ config RCU_STALL_COMMON
config RCU_NEED_SEGCBLIST config RCU_NEED_SEGCBLIST
def_bool ( TREE_RCU || PREEMPT_RCU || TREE_SRCU ) def_bool ( TREE_RCU || PREEMPT_RCU || TREE_SRCU )
config CONTEXT_TRACKING
bool
config CONTEXT_TRACKING_FORCE
bool "Force context tracking"
depends on CONTEXT_TRACKING
default y if !NO_HZ_FULL
help
The major pre-requirement for full dynticks to work is to
support the context tracking subsystem. But there are also
other dependencies to provide in order to make the full
dynticks working.
This option stands for testing when an arch implements the
context tracking backend but doesn't yet fullfill all the
requirements to make the full dynticks feature working.
Without the full dynticks, there is no way to test the support
for context tracking and the subsystems that rely on it: RCU
userspace extended quiescent state and tickless cputime
accounting. This option copes with the absence of the full
dynticks subsystem by forcing the context tracking on all
CPUs in the system.
Say Y only if you're working on the development of an
architecture backend for the context tracking.
Say N otherwise, this option brings an overhead that you
don't want in production.
config RCU_FANOUT config RCU_FANOUT
int "Tree-based hierarchical RCU fanout value" int "Tree-based hierarchical RCU fanout value"
range 2 64 if 64BIT range 2 64 if 64BIT

29
kernel/time/Kconfig
View File

@ -117,6 +117,35 @@ config NO_HZ_FULL
endchoice endchoice
config CONTEXT_TRACKING
bool
config CONTEXT_TRACKING_FORCE
bool "Force context tracking"
depends on CONTEXT_TRACKING
default y if !NO_HZ_FULL
help
The major pre-requirement for full dynticks to work is to
support the context tracking subsystem. But there are also
other dependencies to provide in order to make the full
dynticks working.
This option stands for testing when an arch implements the
context tracking backend but doesn't yet fullfill all the
requirements to make the full dynticks feature working.
Without the full dynticks, there is no way to test the support
for context tracking and the subsystems that rely on it: RCU
userspace extended quiescent state and tickless cputime
accounting. This option copes with the absence of the full
dynticks subsystem by forcing the context tracking on all
CPUs in the system.
Say Y only if you're working on the development of an
architecture backend for the context tracking.
Say N otherwise, this option brings an overhead that you
don't want in production.
config NO_HZ config NO_HZ
bool "Old Idle dynticks config" bool "Old Idle dynticks config"
depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS