search for: kvm_unfair_locks_init_jump

...int kvm_spinlock_init_jump(void) > early_initcall(kvm_spinlock_init_jump); > > #endif /* CONFIG_PARAVIRT_SPINLOCKS */ > + > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/* > + * Enable unfair lock if running in a real para-virtualized environment > + */ > +static __init int kvm_unfair_locks_init_jump(void) > +{ > + if (!kvm_para_available()) > + return 0; > + > + static_key_slow_inc(&paravirt_unfairlocks_enabled); > + printk(KERN_INFO "KVM setup unfair spinlock\n"); > + > + return 0; > +} > +early_initcall(kvm_unfair_locks_init_jump); > +#endif &g...

...int kvm_spinlock_init_jump(void) > early_initcall(kvm_spinlock_init_jump); > > #endif /* CONFIG_PARAVIRT_SPINLOCKS */ > + > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/* > + * Enable unfair lock if running in a real para-virtualized environment > + */ > +static __init int kvm_unfair_locks_init_jump(void) > +{ > + if (!kvm_para_available()) > + return 0; > + > + static_key_slow_inc(&paravirt_unfairlocks_enabled); > + printk(KERN_INFO "KVM setup unfair spinlock\n"); > + > + return 0; > +} > +early_initcall(kvm_unfair_locks_init_jump); > +#endif &g...

...int kvm_spinlock_init_jump(void) > early_initcall(kvm_spinlock_init_jump); > > #endif /* CONFIG_PARAVIRT_SPINLOCKS */ > + > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/* > + * Enable unfair lock if running in a real para-virtualized environment > + */ > +static __init int kvm_unfair_locks_init_jump(void) > +{ > + if (!kvm_para_available()) > + return 0; > + > + static_key_slow_inc(&paravirt_unfairlocks_enabled); > + printk(KERN_INFO "KVM setup unfair spinlock\n"); > + > + return 0; > +} > +early_initcall(kvm_unfair_locks_init_jump); > +#endif &g...

...int kvm_spinlock_init_jump(void) > early_initcall(kvm_spinlock_init_jump); > > #endif /* CONFIG_PARAVIRT_SPINLOCKS */ > + > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/* > + * Enable unfair lock if running in a real para-virtualized environment > + */ > +static __init int kvm_unfair_locks_init_jump(void) > +{ > + if (!kvm_para_available()) > + return 0; > + > + static_key_slow_inc(&paravirt_unfairlocks_enabled); > + printk(KERN_INFO "KVM setup unfair spinlock\n"); > + > + return 0; > +} > +early_initcall(kvm_unfair_locks_init_jump); > +#endif &g...

...nt kvm_spinlock_init_jump(void) > early_initcall(kvm_spinlock_init_jump); > > #endif /* CONFIG_PARAVIRT_SPINLOCKS */ > + > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/* > + * Enable unfair lock if running in a real para-virtualized environment > + */ > +static __init int kvm_unfair_locks_init_jump(void) > +{ > + if (!kvm_para_available()) > + return 0; I think you also need to check for !kvm_para_has_feature(KVM_FEATURE_PV_UNHALT)? Otherwise you might enable this, but the kicker function won't be enabled. > + > + static_key_slow_inc(&paravirt_unfairlocks_enabled); &g...

...nt kvm_spinlock_init_jump(void) > early_initcall(kvm_spinlock_init_jump); > > #endif /* CONFIG_PARAVIRT_SPINLOCKS */ > + > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/* > + * Enable unfair lock if running in a real para-virtualized environment > + */ > +static __init int kvm_unfair_locks_init_jump(void) > +{ > + if (!kvm_para_available()) > + return 0; I think you also need to check for !kvm_para_has_feature(KVM_FEATURE_PV_UNHALT)? Otherwise you might enable this, but the kicker function won't be enabled. > + > + static_key_slow_inc(&paravirt_unfairlocks_enabled); &g...

...nt kvm_spinlock_init_jump(void) > early_initcall(kvm_spinlock_init_jump); > > #endif /* CONFIG_PARAVIRT_SPINLOCKS */ > + > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/* > + * Enable unfair lock if running in a real para-virtualized environment > + */ > +static __init int kvm_unfair_locks_init_jump(void) > +{ > + if (!kvm_para_available()) > + return 0; > + kvm_kick_cpu_type() in patch 8 assumes that host has support for kick hypercall (KVM_HC_KICK_CPU). I think for that we need explicit check of this kvm_para_has_feature(KVM_FEATURE_PV_UNHALT). otherwise things may break for...

...nt kvm_spinlock_init_jump(void) > early_initcall(kvm_spinlock_init_jump); > > #endif /* CONFIG_PARAVIRT_SPINLOCKS */ > + > +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS > +/* > + * Enable unfair lock if running in a real para-virtualized environment > + */ > +static __init int kvm_unfair_locks_init_jump(void) > +{ > + if (!kvm_para_available()) > + return 0; > + kvm_kick_cpu_type() in patch 8 assumes that host has support for kick hypercall (KVM_HC_KICK_CPU). I think for that we need explicit check of this kvm_para_has_feature(KVM_FEATURE_PV_UNHALT). otherwise things may break for...

...el/kvm.c @@ -826,3 +826,20 @@ static __init int kvm_spinlock_init_jump(void) early_initcall(kvm_spinlock_init_jump); #endif /* CONFIG_PARAVIRT_SPINLOCKS */ + +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS +/* + * Enable unfair lock if running in a real para-virtualized environment + */ +static __init int kvm_unfair_locks_init_jump(void) +{ + if (!kvm_para_available()) + return 0; + + static_key_slow_inc(&paravirt_unfairlocks_enabled); + printk(KERN_INFO "KVM setup unfair spinlock\n"); + + return 0; +} +early_initcall(kvm_unfair_locks_init_jump); +#endif -- 1.7.1

...el/kvm.c @@ -826,3 +826,20 @@ static __init int kvm_spinlock_init_jump(void) early_initcall(kvm_spinlock_init_jump); #endif /* CONFIG_PARAVIRT_SPINLOCKS */ + +#ifdef CONFIG_PARAVIRT_UNFAIR_LOCKS +/* + * Enable unfair lock if running in a real para-virtualized environment + */ +static __init int kvm_unfair_locks_init_jump(void) +{ + if (!kvm_para_available()) + return 0; + + static_key_slow_inc(&paravirt_unfairlocks_enabled); + printk(KERN_INFO "KVM setup unfair spinlock\n"); + + return 0; +} +early_initcall(kvm_unfair_locks_init_jump); +#endif -- 1.7.1

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v6->v7: - Remove an atomic operation from the 2-task contending code - Shorten the names of some macros - Make the queue waiter to attempt to steal lock when unfair lock is enabled. - Remove lock holder kick from the PV code and fix a race condition - Run the unfair lock & PV code on overcommitted KVM guests to collect performance data. v5->v6: - Change the optimized

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

v4->v5: - Move the optimized 2-task contending code to the generic file to enable more architectures to use it without code duplication. - Address some of the style-related comments by PeterZ. - Allow the use of unfair queue spinlock in a real para-virtualized execution environment. - Add para-virtualization support to the qspinlock code by ensuring that the lock holder and queue

v5->v6: - Change the optimized 2-task contending code to make it fairer at the expense of a bit of performance. - Add a patch to support unfair queue spinlock for Xen. - Modify the PV qspinlock code to follow what was done in the PV ticketlock. - Add performance data for the unfair lock as well as the PV support code. v4->v5: - Move the optimized 2-task contending code to the

v5->v6: - Change the optimized 2-task contending code to make it fairer at the expense of a bit of performance. - Add a patch to support unfair queue spinlock for Xen. - Modify the PV qspinlock code to follow what was done in the PV ticketlock. - Add performance data for the unfair lock as well as the PV support code. v4->v5: - Move the optimized 2-task contending code to the