From: Frederic Weisbecker Date: Sat, 13 Apr 2013 15:04:04 +0000 (+0200) Subject: nohz: Improve a bit the full dynticks Kconfig documentation X-Git-Tag: firefly_0821_release~3680^2~571^2~14 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fae30dd6698ecaa93cb50213266c224bc550c32c;p=firefly-linux-kernel-4.4.55.git nohz: Improve a bit the full dynticks Kconfig documentation Remove the "single task" statement from CONFIG_NO_HZ_FULL title. The constraint can be invalidated when tasks from other sched classes than SCHED_FAIR are running. Moreover it's possible that hrtick join the party in the future. Also add a line about the dependency on SMP. Reported-by: Ingo Molnar Signed-off-by: Frederic Weisbecker Cc: Chris Metcalf Cc: Christoph Lameter Cc: Geoff Levand Cc: Gilad Ben Yossef Cc: Hakan Akkan Cc: Ingo Molnar Cc: Kevin Hilman Cc: Li Zhong Cc: Paul E. McKenney Cc: Paul Gortmaker Cc: Peter Zijlstra Cc: Steven Rostedt Cc: Thomas Gleixner --- diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 3b683227a10d..358d601a4fec 100644 --- a/kernel/time/Kconfig +++ b/kernel/time/Kconfig @@ -97,11 +97,13 @@ config NO_HZ_IDLE Most of the time you want to say Y here. config NO_HZ_FULL - bool "Full dynticks system (tickless single task)" + bool "Full dynticks system (tickless)" # NO_HZ_COMMON dependency depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS - # RCU_USER_QS - depends on HAVE_CONTEXT_TRACKING && SMP + # We need at least one periodic CPU for timekeeping + depends on SMP + # RCU_USER_QS dependency + depends on HAVE_CONTEXT_TRACKING # RCU_NOCB_CPU dependency depends on TREE_RCU || TREE_PREEMPT_RCU depends on VIRT_CPU_ACCOUNTING_GEN