[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 2/5] build: Hook the schedulers into Kconfig
Allow the schedulers to be independently enabled or disabled at compile-time. To match existing behavior, all four schedulers are compiled in by default, although the Credit2, RTDS, and ARINC653 are marked EXPERIMENTAL to match their not currently supported status. CC: George Dunlap <george.dunlap@xxxxxxxxxxxxx> CC: Dario Faggioli <dario.faggioli@xxxxxxxxxx> Signed-off-by: Jonathan Creekmore <jonathan.creekmore@xxxxxxxxx> Reviewed-by: Doug Goldstein <cardoe@xxxxxxxxxx> --- Changed since v2: * Hid the scheduler menu behind the EXPERT option * Provide static inlines for credit functions that are assumed to be always available * Provide an absolute default of the credit scheduler if the scheduler menu is not visible Changed since v1: * Marked credit2 as EXPERIMENTAL * Removed confusing language from the commit message * Alphabetize the schedulers --- xen/common/Kconfig | 67 +++++++++++++++++++++++++++++++++++++++++++++++++ xen/common/Makefile | 8 +++--- xen/common/schedule.c | 12 +++++++-- xen/include/xen/sched.h | 5 ++++ 4 files changed, 86 insertions(+), 6 deletions(-) diff --git a/xen/common/Kconfig b/xen/common/Kconfig index 046e257..db7411b 100644 --- a/xen/common/Kconfig +++ b/xen/common/Kconfig @@ -51,4 +51,71 @@ config KEXEC If unsure, say Y. +# Enable schedulers +menu "Schedulers" + visible if EXPERT = "y" + +config SCHED_CREDIT + bool "Credit scheduler support" + default y + ---help--- + The traditional credit scheduler is a general purpose scheduler. + + If unsure, say Y. + +config SCHED_CREDIT2 + bool "Credit2 scheduler support (EXPERIMENTAL)" + default y + ---help--- + The credit2 scheduler is a general purpose scheduler that is + optimized for lower latency and higher VM density. + + If unsure, say Y. + +config SCHED_RTDS + bool "RTDS scheduler support (EXPERIMENTAL)" + default y + ---help--- + The RTDS scheduler is a soft and firm real-time scheduler for + multicore, targeted for embedded, automotive, graphics and gaming + in the cloud, and general low-latency workloads. + + If unsure, say N. + +config SCHED_ARINC653 + bool "ARINC653 scheduler support (EXPERIMENTAL)" + default y + ---help--- + The ARINC653 scheduler is a hard real-time scheduler for single + cores, targeted for avionics, drones, and medical devices. + + If unsure, say N. + +choice + prompt "Default Scheduler?" + default SCHED_CREDIT_DEFAULT if SCHED_CREDIT + default SCHED_CREDIT2_DEFAULT if SCHED_CREDIT2 + default SCHED_RTDS_DEFAULT if SCHED_RTDS + default SCHED_ARINC653_DEFAULT if SCHED_ARINC653 + + config SCHED_CREDIT_DEFAULT + bool "Credit Scheduler" if SCHED_CREDIT + config SCHED_CREDIT2_DEFAULT + bool "Credit2 Scheduler" if SCHED_CREDIT2 + config SCHED_RTDS_DEFAULT + bool "RT Scheduler" if SCHED_RTDS + config SCHED_ARINC653_DEFAULT + bool "ARINC653 Scheduler" if SCHED_ARINC653 +endchoice + +config SCHED_DEFAULT + string + default "credit" if SCHED_CREDIT_DEFAULT + default "credit2" if SCHED_CREDIT2_DEFAULT + default "rtds" if SCHED_RTDS_DEFAULT + default "arinc653" if SCHED_ARINC653_DEFAULT + default "credit" + +endmenu + endmenu diff --git a/xen/common/Makefile b/xen/common/Makefile index 8ab15ba..29a5916 100644 --- a/xen/common/Makefile +++ b/xen/common/Makefile @@ -30,10 +30,10 @@ obj-y += rangeset.o obj-y += radix-tree.o obj-y += rbtree.o obj-y += rcupdate.o -obj-y += sched_credit.o -obj-y += sched_credit2.o -obj-y += sched_arinc653.o -obj-y += sched_rt.o +obj-$(CONFIG_SCHED_ARINC653) += sched_arinc653.o +obj-$(CONFIG_SCHED_CREDIT) += sched_credit.o +obj-$(CONFIG_SCHED_CREDIT2) += sched_credit2.o +obj-$(CONFIG_SCHED_RTDS) += sched_rt.o obj-y += schedule.o obj-y += shutdown.o obj-y += softirq.o diff --git a/xen/common/schedule.c b/xen/common/schedule.c index d121896..2f98a48 100644 --- a/xen/common/schedule.c +++ b/xen/common/schedule.c @@ -38,8 +38,8 @@ #include <public/sched.h> #include <xsm/xsm.h> -/* opt_sched: scheduler - default to credit */ -static char __initdata opt_sched[10] = "credit"; +/* opt_sched: scheduler - default to configured value */ +static char __initdata opt_sched[10] = CONFIG_SCHED_DEFAULT; string_param("sched", opt_sched); /* if sched_smt_power_savings is set, @@ -65,10 +65,18 @@ DEFINE_PER_CPU(struct schedule_data, schedule_data); DEFINE_PER_CPU(struct scheduler *, scheduler); static const struct scheduler *schedulers[] = { +#ifdef CONFIG_SCHED_CREDIT &sched_credit_def, +#endif +#ifdef CONFIG_SCHED_CREDIT2 &sched_credit2_def, +#endif +#ifdef CONFIG_SCHED_ARINC653 &sched_arinc653_def, +#endif +#ifdef CONFIG_SCHED_RTDS &sched_rtds_def, +#endif }; static struct scheduler __read_mostly ops; diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index fc61fc3..246338e 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -850,8 +850,13 @@ static inline bool_t is_vcpu_online(const struct vcpu *v) return !test_bit(_VPF_down, &v->pause_flags); } +#ifdef CONFIG_SCHED_CREDIT void set_vcpu_migration_delay(unsigned int delay); unsigned int get_vcpu_migration_delay(void); +#else +static inline void set_vcpu_migration_delay(unsigned int delay) { } +static inline unsigned int get_vcpu_migration_delay(void) { return 0; } +#endif extern bool_t sched_smt_power_savings; -- 2.6.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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