From fae30dd6698ecaa93cb50213266c224bc550c32c Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Sat, 13 Apr 2013 17:04:04 +0200 Subject: [PATCH] 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 --- kernel/time/Kconfig | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) 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 -- 2.20.1