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Signed-off-by: Ankur Arora --- kernel/Kconfig.preempt | 32 +++++++++----------------------- kernel/sched/core.c | 29 +++-------------------------- 2 files changed, 12 insertions(+), 49 deletions(-) diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt index 60f1bfc3c7b2..5876e30c5740 100644 --- a/kernel/Kconfig.preempt +++ b/kernel/Kconfig.preempt @@ -2,11 +2,10 @@ choice prompt "Preemption Model" - default PREEMPT_NONE_BEHAVIOUR + default PREEMPT_NONE -config PREEMPT_NONE_BEHAVIOUR +config PREEMPT_NONE bool "No Forced Preemption (Server)" - select PREEMPT_NONE if !PREEMPT_DYNAMIC help This is the traditional Linux preemption model, geared towards throughput. It will still provide good latencies most of the @@ -18,10 +17,9 @@ config PREEMPT_NONE_BEHAVIOUR raw processing power of the kernel, irrespective of scheduling latencies. -config PREEMPT_VOLUNTARY_BEHAVIOUR +config PREEMPT_VOLUNTARY bool "Voluntary Kernel Preemption (Desktop)" depends on !ARCH_NO_PREEMPT - select PREEMPT_VOLUNTARY if !PREEMPT_DYNAMIC help This option reduces the latency of the kernel by adding more "explicit preemption points" to the kernel code. These new @@ -37,10 +35,12 @@ config PREEMPT_VOLUNTARY_BEHAVIOUR Select this if you are building a kernel for a desktop system. -config PREEMPT_BEHAVIOUR +config PREEMPT bool "Preemptible Kernel (Low-Latency Desktop)" depends on !ARCH_NO_PREEMPT - select PREEMPT + select PREEMPTION + select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK + select PREEMPT_DYNAMIC if HAVE_PREEMPT_DYNAMIC help This option reduces the latency of the kernel by making all kernel code (that is not executing in a critical section) @@ -58,7 +58,7 @@ config PREEMPT_BEHAVIOUR config PREEMPT_RT bool "Fully Preemptible Kernel (Real-Time)" - depends on EXPERT && ARCH_SUPPORTS_RT && !PREEMPT_DYNAMIC + depends on EXPERT && ARCH_SUPPORTS_RT select PREEMPTION help This option turns the kernel into a real-time kernel by replacing @@ -75,17 +75,6 @@ config PREEMPT_RT endchoice -config PREEMPT_NONE - bool - -config PREEMPT_VOLUNTARY - bool - -config PREEMPT - bool - select PREEMPTION - select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK - config PREEMPT_COUNT bool @@ -94,10 +83,7 @@ config PREEMPTION select PREEMPT_COUNT config PREEMPT_DYNAMIC - bool "Preemption behaviour defined on boot" - depends on HAVE_PREEMPT_DYNAMIC - select PREEMPT - default y + bool help This option allows to define the preemption model on the kernel command line parameter and thus override the default preemption diff --git a/kernel/sched/core.c b/kernel/sched/core.c index d3828d90bf84..12f255e038ed 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6991,13 +6991,12 @@ EXPORT_STATIC_CALL_TRAMP(preempt_schedule_notrace); */ enum { - preempt_dynamic_undefined = -1, - preempt_dynamic_none, + preempt_dynamic_none = 0, preempt_dynamic_voluntary, preempt_dynamic_full, }; -int preempt_dynamic_mode = preempt_dynamic_undefined; +int preempt_dynamic_mode = preempt_dynamic_full; int sched_dynamic_mode(const char *str) { @@ -7070,27 +7069,7 @@ static int __init setup_preempt_mode(char *str) } __setup("preempt=", setup_preempt_mode); -static void __init preempt_dynamic_init(void) -{ - if (preempt_dynamic_mode == preempt_dynamic_undefined) { - if (IS_ENABLED(CONFIG_PREEMPT_NONE_BEHAVIOUR)) { - sched_dynamic_update(preempt_dynamic_none); - } else if (IS_ENABLED(CONFIG_PREEMPT_VOLUNTARY_BEHAVIOUR)) { - sched_dynamic_update(preempt_dynamic_voluntary); - } else { - /* Default static call setting, nothing to do */ - WARN_ON_ONCE(!IS_ENABLED(CONFIG_PREEMPT_BEHAVIOUR)); - preempt_dynamic_mode = preempt_dynamic_full; - pr_info("Dynamic Preempt: full\n"); - } - } -} - -#else /* !CONFIG_PREEMPT_DYNAMIC */ - -static inline void preempt_dynamic_init(void) { } - -#endif /* #ifdef CONFIG_PREEMPT_DYNAMIC */ +#endif /* CONFIG_PREEMPT_DYNAMIC */ /* * This is the entry point to schedule() from kernel preemption @@ -9966,8 +9945,6 @@ void __init sched_init(void) init_uclamp(); - preempt_dynamic_init(); - scheduler_running = 1; }