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...config > option is selected. > > Signed-off-by: Waiman Long <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 17 +++++++++++++++++ > 1 files changed, 17 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 713f1b3..a489140 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/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_LOC...

...config > option is selected. > > Signed-off-by: Waiman Long <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 17 +++++++++++++++++ > 1 files changed, 17 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 713f1b3..a489140 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/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_LOC...

...el config > option is selected. > > Signed-off-by: Waiman Long <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 17 +++++++++++++++++ > 1 files changed, 17 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 713f1b3..a489140 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/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...

...el config > option is selected. > > Signed-off-by: Waiman Long <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 17 +++++++++++++++++ > 1 files changed, 17 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 713f1b3..a489140 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/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...

...config > option is selected. > > Signed-off-by: Waiman Long <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 17 +++++++++++++++++ > 1 files changed, 17 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 713f1b3..a489140 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/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_LOC...

...config > option is selected. > > Signed-off-by: Waiman Long <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 17 +++++++++++++++++ > 1 files changed, 17 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 713f1b3..a489140 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/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_LOC...

...el config > option is selected. > > Signed-off-by: Waiman Long <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 17 +++++++++++++++++ > 1 files changed, 17 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 713f1b3..a489140 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/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...

...el config > option is selected. > > Signed-off-by: Waiman Long <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 17 +++++++++++++++++ > 1 files changed, 17 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index 713f1b3..a489140 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/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...

...M guest when the PARAVIRT_UNFAIR_LOCKS kernel config option is selected. Signed-off-by: Waiman Long <Waiman.Long at hp.com> --- arch/x86/kernel/kvm.c | 17 +++++++++++++++++ 1 files changed, 17 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 713f1b3..a489140 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/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...

...M guest when the PARAVIRT_UNFAIR_LOCKS kernel config option is selected. Signed-off-by: Waiman Long <Waiman.Long at hp.com> --- arch/x86/kernel/kvm.c | 17 +++++++++++++++++ 1 files changed, 17 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 713f1b3..a489140 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/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...

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

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.

v7->v8: - Remove one unneeded atomic operation from the slowpath, thus improving performance. - Simplify some of the codes and add more comments. - Test for X86_FEATURE_HYPERVISOR CPU feature bit to enable/disable unfair lock. - Reduce unfair lock slowpath lock stealing frequency depending on its distance from the queue head. - Add performance data for IvyBridge-EX CPU.