From a4cffdad731447217701d3bc6da4587bbb4d2cbd Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Thu, 20 Dec 2018 09:05:25 -0800 Subject: 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 Signed-off-by: Thomas Gleixner Cc: Frederic Weisbecker Link: https://lkml.kernel.org/r/20181220170525.GA12579@linux.ibm.com --- kernel/time/Kconfig | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'kernel/time/Kconfig') 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 -- cgit v1.2.3