Messages in this thread Patch in this message | | | From | Frederic Weisbecker <> | Subject | [PATCH 2/7] nohz: Introduce adaptive nohz config | Date | Wed, 13 Jun 2012 18:19:52 +0200 |
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Prepare a config option for the full adaptive nohz feature. This way we can start to put the related code under appropriate ifdefs.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Alessio Igor Bogani <abogani@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Avi Kivity <avi@redhat.com> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Christoph Lameter <cl@linux.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> 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@ti.com> Cc: Max Krasnyansky <maxk@qualcomm.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Sven-Thorsten Dietrich <thebigcorporation@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> --- arch/Kconfig | 8 ++++++++ kernel/time/Kconfig | 7 +++++++ 2 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/arch/Kconfig b/arch/Kconfig index 8c3d957..a71c698 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -251,6 +251,14 @@ config HAVE_CMPXCHG_DOUBLE config ARCH_WANT_OLD_COMPAT_IPC bool +config HAVE_NO_HZ_FULL + bool + help + An arch should select this symbols if it provides + the kernel entry/exit hooks necessary to implement + full tickless support. This includes syscall entry/exit, + exceptions entry/exit and do_notify_resume() hooks. + config HAVE_ARCH_SECCOMP_FILTER bool help diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 0883fa1..5ac4b74 100644 --- a/kernel/time/Kconfig +++ b/kernel/time/Kconfig @@ -65,6 +65,13 @@ config NO_HZ This option enables a tickless idle system: timer interrupts will only trigger on an as-needed basis when the system is idle. +config NO_HZ_FULL + bool "Full tickless system (Dynamic Ticks)" + depends on NO_HZ && HAVE_NO_HZ_FULL + help + This option enables a full adaptive tickless system: timer + interrupts will globally only trigger on an as-needed basis. + config HIGH_RES_TIMERS bool "High Resolution Timer Support" depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS -- 1.7.5.4
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