Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

> diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h > index 4cd8732..a5fd858 100644 > --- a/arch/arm/include/asm/kvm_host.h > +++ b/arch/arm/include/asm/kvm_host.h > @@ -284,6 +284,10 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) > {} > static inline

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

> diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h > index 4cd8732..a5fd858 100644 > --- a/arch/arm/include/asm/kvm_host.h > +++ b/arch/arm/include/asm/kvm_host.h > @@ -284,6 +284,10 @@ static inline void kvm_arch_sync_events(struct kvm *kvm) > {} > static inline

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 2:01 GMT+08:00 David Matlack : > On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: >> From: Wanpeng Li > > I'm ok with this patch, but I'd like to better understand the target > workloads. What type of workloads do you

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 2:01 GMT+08:00 David Matlack : > On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: >> From: Wanpeng Li > > I'm ok with this patch, but I'd like to better understand the target > workloads. What type of workloads do you expect to benefit from this? > In addition, as Paolo great

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 14:59 GMT+08:00 Christian Borntraeger : > On 05/24/2016 04:25 AM, Wanpeng Li wrote: >> 2016-05-24 10:19 GMT+08:00 Wanpeng Li : >>> 2016-05-24 2:01 GMT+08:00 David Matlack : On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 14:59 GMT+08:00 Christian Borntraeger : > On 05/24/2016 04:25 AM, Wanpeng Li wrote: >> 2016-05-24 10:19 GMT+08:00 Wanpeng Li : >>> 2016-05-24 2:01 GMT+08:00 David Matlack : On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: > From: Wanpeng Li I'm ok with this patch,

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 14:59 GMT+08:00 Christian Borntraeger : > On 05/24/2016 04:25 AM, Wanpeng Li wrote: >> 2016-05-24 10:19 GMT+08:00 Wanpeng Li : >>> 2016-05-24 2:01 GMT+08:00 David Matlack : On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 14:59 GMT+08:00 Christian Borntraeger : > On 05/24/2016 04:25 AM, Wanpeng Li wrote: >> 2016-05-24 10:19 GMT+08:00 Wanpeng Li : >>> 2016-05-24 2:01 GMT+08:00 David Matlack : On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: > From: Wanpeng Li I'm ok with this patch,

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 10:19 GMT+08:00 Wanpeng Li : > 2016-05-24 2:01 GMT+08:00 David Matlack : >> On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: >>> From: Wanpeng Li >> >> I'm ok with this patch, but I'd like to

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 10:19 GMT+08:00 Wanpeng Li : > 2016-05-24 2:01 GMT+08:00 David Matlack : >> On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: >>> From: Wanpeng Li >> >> I'm ok with this patch, but I'd like to better understand the target >> workloads. What type of workloads do you expect to benefit

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

On 05/24/2016 04:25 AM, Wanpeng Li wrote: > 2016-05-24 10:19 GMT+08:00 Wanpeng Li : >> 2016-05-24 2:01 GMT+08:00 David Matlack : >>> On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: From: Wanpeng Li >>>

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

On 05/24/2016 04:25 AM, Wanpeng Li wrote: > 2016-05-24 10:19 GMT+08:00 Wanpeng Li : >> 2016-05-24 2:01 GMT+08:00 David Matlack : >>> On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: From: Wanpeng Li >>> >>> I'm ok with this patch, but I'd like to better understand the target >>>

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 10:19 GMT+08:00 Wanpeng Li : > 2016-05-24 2:01 GMT+08:00 David Matlack : >> On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: >>> From: Wanpeng Li >> >> I'm ok with this patch, but I'd like to

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 10:19 GMT+08:00 Wanpeng Li : > 2016-05-24 2:01 GMT+08:00 David Matlack : >> On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: >>> From: Wanpeng Li >> >> I'm ok with this patch, but I'd like to better understand the target >> workloads. What type of workloads do you expect to benefit

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 2:01 GMT+08:00 David Matlack : > On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: >> From: Wanpeng Li > > I'm ok with this patch, but I'd like to better understand the target > workloads. What type of workloads do you

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

2016-05-24 2:01 GMT+08:00 David Matlack : > On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: >> From: Wanpeng Li > > I'm ok with this patch, but I'd like to better understand the target > workloads. What type of workloads do you expect to benefit from this? dynticks guests I think is one of

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: > From: Wanpeng Li I'm ok with this patch, but I'd like to better understand the target workloads. What type of workloads do you expect to benefit from this? > > If an emulated lapic timer will fire

Re: [PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

On Sun, May 22, 2016 at 5:42 PM, Wanpeng Li wrote: > From: Wanpeng Li I'm ok with this patch, but I'd like to better understand the target workloads. What type of workloads do you expect to benefit from this? > > If an emulated lapic timer will fire soon(in the scope of 10us the > base of

[PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

From: Wanpeng Li If an emulated lapic timer will fire soon(in the scope of 10us the base of dynamic halt-polling, lower-end of message passing workload latency TCP_RR's poll time < 10us) we can treat it as a short halt, and poll to wait it fire, the fire callback

[PATCH v3] KVM: halt-polling: poll if emulated lapic timer will fire soon

From: Wanpeng Li If an emulated lapic timer will fire soon(in the scope of 10us the base of dynamic halt-polling, lower-end of message passing workload latency TCP_RR's poll time < 10us) we can treat it as a short halt, and poll to wait it fire, the fire callback apic_timer_fn() will set