Provide a new kernel config that forces all CPUs to be part of the full dynticks range, except the boot one for timekeeping.
This is helpful for those who don't need a finegrained range of full dynticks CPU and also for automated testing. Suggested-by: Ingo Molnar <[email protected]> Signed-off-by: Frederic Weisbecker <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Chris Metcalf <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Geoff Levand <[email protected]> Cc: Gilad Ben Yossef <[email protected]> Cc: Hakan Akkan <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Kevin Hilman <[email protected]> Cc: Li Zhong <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Paul Gortmaker <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Thomas Gleixner <[email protected]> --- kernel/time/Kconfig | 10 ++++++++++ kernel/time/tick-sched.c | 5 +++++ 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 5a87c03..407d771 100644 --- a/kernel/time/Kconfig +++ b/kernel/time/Kconfig @@ -98,6 +98,16 @@ config NO_HZ_EXTENDED Say N. +config NO_HZ_EXTENDED_ALL + bool "Full dynticks system on all CPUs" + depends on NO_HZ_EXTENDED + help + Force all CPUs to be full dynticks. The range specified in the + nohz_extended boot option will then be ignored. + + Note the boot CPU will still be kept outside the range to handle + the timekeeping duty. + config HIGH_RES_TIMERS bool "High Resolution Timer Support" depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index a76d95e..0a3952c 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -161,10 +161,15 @@ static int __init tick_nohz_extended_setup(char *str) int cpu; alloc_bootmem_cpumask_var(&nohz_extended_mask); + +#ifdef CONFIG_NO_HZ_EXTENDED_ALL + cpumask_setall(nohz_extended_mask); +#else if (cpulist_parse(str, nohz_extended_mask) < 0) { pr_warning("NOHZ: Incorrect nohz_extended cpumask\n"); return 1; } +#endif cpu = smp_processor_id(); if (cpumask_test_cpu(cpu, nohz_extended_mask)) { -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
