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...th Xen. Signed-off-by: Waiman Long <Waiman.Long at hp.com> --- arch/x86/kernel/kvm.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++ kernel/Kconfig.locks | 2 +- 2 files changed, 55 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index f318e78..3ddc436 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -568,6 +568,7 @@ static void kvm_kick_cpu(int cpu) kvm_hypercall2(KVM_HC_KICK_CPU, flags, apicid); } +#ifndef CONFIG_QUEUE_SPINLOCK enum kvm_contention_stat { TAKEN_SLOW, TAKEN_SLOW_PICKUP, @@ -795,6 +796,55 @@ sta...

...m test. Signed-off-by: Waiman Long <Waiman.Long at hp.com> --- arch/x86/kernel/kvm.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++++ kernel/Kconfig.locks | 2 +- 2 files changed, 88 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index f318e78..aaf704e 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -568,6 +568,7 @@ static void kvm_kick_cpu(int cpu) kvm_hypercall2(KVM_HC_KICK_CPU, flags, apicid); } +#ifndef CONFIG_QUEUE_SPINLOCK enum kvm_contention_stat { TAKEN_SLOW, TAKEN_SLOW_PICKUP, @@ -795,6 +796,87 @@ sta...

...<Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++ > kernel/Kconfig.locks | 2 +- > 2 files changed, 55 insertions(+), 1 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index f318e78..3ddc436 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/kvm.c > @@ -568,6 +568,7 @@ static void kvm_kick_cpu(int cpu) > kvm_hypercall2(KVM_HC_KICK_CPU, flags, apicid); > } > > +#ifndef CONFIG_QUEUE_SPINLOCK > enum kvm_contention_stat { > TAKEN_SLOW,...

...<Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++ > kernel/Kconfig.locks | 2 +- > 2 files changed, 55 insertions(+), 1 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index f318e78..3ddc436 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/kvm.c > @@ -568,6 +568,7 @@ static void kvm_kick_cpu(int cpu) > kvm_hypercall2(KVM_HC_KICK_CPU, flags, apicid); > } > > +#ifndef CONFIG_QUEUE_SPINLOCK > enum kvm_contention_stat { > TAKEN_SLOW,...

...ention. Signed-off-by: Waiman Long <Waiman.Long at hp.com> --- arch/x86/kernel/kvm.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++ kernel/Kconfig.locks | 2 +- 2 files changed, 83 insertions(+), 1 deletions(-) diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index f318e78..c28bc1b 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -568,6 +568,7 @@ static void kvm_kick_cpu(int cpu) kvm_hypercall2(KVM_HC_KICK_CPU, flags, apicid); } +#ifndef CONFIG_QUEUE_SPINLOCK enum kvm_contention_stat { TAKEN_SLOW, TAKEN_SLOW_PICKUP, @@ -795,6 +796,82 @@ sta...

...g <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++ > kernel/Kconfig.locks | 2 +- > 2 files changed, 83 insertions(+), 1 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index f318e78..c28bc1b 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/kvm.c > @@ -568,6 +568,7 @@ static void kvm_kick_cpu(int cpu) > kvm_hypercall2(KVM_HC_KICK_CPU, flags, apicid); > } > > +#ifndef CONFIG_QUEUE_SPINLOCK > enum kvm_contention_stat { > TAKEN_SLOW, &g...

...g <Waiman.Long at hp.com> > --- > arch/x86/kernel/kvm.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++ > kernel/Kconfig.locks | 2 +- > 2 files changed, 83 insertions(+), 1 deletions(-) > > diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c > index f318e78..c28bc1b 100644 > --- a/arch/x86/kernel/kvm.c > +++ b/arch/x86/kernel/kvm.c > @@ -568,6 +568,7 @@ static void kvm_kick_cpu(int cpu) > kvm_hypercall2(KVM_HC_KICK_CPU, flags, apicid); > } > > +#ifndef CONFIG_QUEUE_SPINLOCK > enum kvm_contention_stat { > TAKEN_SLOW, &g...

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

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