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| author | Paul E. McKenney <paulmck@linux.ibm.com> | 2018-12-20 09:05:25 -0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-01-15 11:16:41 +0100 |
| commit | a4cffdad731447217701d3bc6da4587bbb4d2cbd (patch) | |
| tree | f0a5afd7f83b3386cf47102d991abc3c9673f784 /kernel/time/Kconfig | |
| parent | 1c7fc5cbc33980acd13d668f1c8f0313d6ae9fd8 (diff) | |
| download | lwn-a4cffdad731447217701d3bc6da4587bbb4d2cbd.tar.gz lwn-a4cffdad731447217701d3bc6da4587bbb4d2cbd.zip | |
time: Move CONTEXT_TRACKING to kernel/time/Kconfig
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
Diffstat (limited to 'kernel/time/Kconfig')
| -rw-r--r-- | kernel/time/Kconfig | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 58b981f4bb5d..e2c038d6c13c 100644 --- a/kernel/time/Kconfig +++ b/kernel/time/Kconfig @@ -117,6 +117,35 @@ config NO_HZ_FULL 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 bool "Old Idle dynticks config" depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS |