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nohz: Improve a bit the full dynticks Kconfig documentation

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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 <mingo@kernel.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Frederic Weisbecker 2013-04-13 17:04:04 +02:00
parent 5b533f4ff5
commit fae30dd669
1 changed files with 5 additions and 3 deletions
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8
kernel/time/Kconfig
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@ -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