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...> kernel image with pSeries. So we need return false if we are runnig as > powerNV. The another fact is that lppaca->yiled_count keeps zero on > powerNV. So we can just skip the machine type. Lock holder vCPU preemption can be detected by hardware pSeries or paravirt method? Regards, Wanpeng Li

...> kernel image with pSeries. So we need return false if we are runnig as > powerNV. The another fact is that lppaca->yiled_count keeps zero on > powerNV. So we can just skip the machine type. Lock holder vCPU preemption can be detected by hardware pSeries or paravirt method? Regards, Wanpeng Li

Cc Paolo, kvm ml 2016-07-06 12:58 GMT+08:00 xinhui <xinhui.pan at linux.vnet.ibm.com>: > Hi, wanpeng > > On 2016?07?05? 17:57, Wanpeng Li wrote: >> >> Hi Xinhui, >> 2016-06-28 22:43 GMT+08:00 Pan Xinhui <xinhui.pan at linux.vnet.ibm.com>: >>> >>> This is to fix some lock holder preemption issues. Some other locks >>> implementation do a spin...

Cc Paolo, kvm ml 2016-07-06 12:58 GMT+08:00 xinhui <xinhui.pan at linux.vnet.ibm.com>: > Hi, wanpeng > > On 2016?07?05? 17:57, Wanpeng Li wrote: >> >> Hi Xinhui, >> 2016-06-28 22:43 GMT+08:00 Pan Xinhui <xinhui.pan at linux.vnet.ibm.com>: >>> >>> This is to fix some lock holder preemption issues. Some other locks >>> implementation do a spin...

2016-07-06 15:58 GMT+08:00 Peter Zijlstra <peterz at infradead.org>: > On Wed, Jul 06, 2016 at 02:46:34PM +0800, Wanpeng Li wrote: >> > SO it's easy for ppc to implement such interface. Note that yield_count is >> > set by powerVM/KVM. >> > and only pSeries can run a guest for now. :) >> > >> > I also review x86 related code, looks like we need add one hyer-call to get...

2016-07-06 15:58 GMT+08:00 Peter Zijlstra <peterz at infradead.org>: > On Wed, Jul 06, 2016 at 02:46:34PM +0800, Wanpeng Li wrote: >> > SO it's easy for ppc to implement such interface. Note that yield_count is >> > set by powerVM/KVM. >> > and only pSeries can run a guest for now. :) >> > >> > I also review x86 related code, looks like we need add one hyer-call to get...

On Thu, Jul 07, 2016 at 04:48:05PM +0800, Wanpeng Li wrote: > 2016-07-06 20:28 GMT+08:00 Paolo Bonzini <pbonzini at redhat.com>: > > Hmm, you're right. We can use bit 0 of struct kvm_steal_time's flags to > > indicate that pad[0] is a "VCPU preempted" field; if pad[0] is 1, the > > VCPU has been schedu...

On Thu, Jul 07, 2016 at 04:48:05PM +0800, Wanpeng Li wrote: > 2016-07-06 20:28 GMT+08:00 Paolo Bonzini <pbonzini at redhat.com>: > > Hmm, you're right. We can use bit 0 of struct kvm_steal_time's flags to > > indicate that pad[0] is a "VCPU preempted" field; if pad[0] is 1, the > > VCPU has been schedu...

2016-07-07 18:12 GMT+08:00 Wanpeng Li <kernellwp at gmail.com>: > 2016-07-07 17:42 GMT+08:00 Peter Zijlstra <peterz at infradead.org>: >> On Thu, Jul 07, 2016 at 04:48:05PM +0800, Wanpeng Li wrote: >>> 2016-07-06 20:28 GMT+08:00 Paolo Bonzini <pbonzini at redhat.com>: >>> > Hmm, you...

2016-07-07 18:12 GMT+08:00 Wanpeng Li <kernellwp at gmail.com>: > 2016-07-07 17:42 GMT+08:00 Peter Zijlstra <peterz at infradead.org>: >> On Thu, Jul 07, 2016 at 04:48:05PM +0800, Wanpeng Li wrote: >>> 2016-07-06 20:28 GMT+08:00 Paolo Bonzini <pbonzini at redhat.com>: >>> > Hmm, you...

On 06/07/2016 14:08, Wanpeng Li wrote: > 2016-07-06 18:44 GMT+08:00 Paolo Bonzini <pbonzini at redhat.com>: >> >> >> On 06/07/2016 08:52, Peter Zijlstra wrote: >>> On Tue, Jun 28, 2016 at 10:43:07AM -0400, Pan Xinhui wrote: >>>> change fomr v1: >>>> a simplier de...

On 06/07/2016 14:08, Wanpeng Li wrote: > 2016-07-06 18:44 GMT+08:00 Paolo Bonzini <pbonzini at redhat.com>: >> >> >> On 06/07/2016 08:52, Peter Zijlstra wrote: >>> On Tue, Jun 28, 2016 at 10:43:07AM -0400, Pan Xinhui wrote: >>>> change fomr v1: >>>> a simplier de...

Hi, wanpeng On 2016?07?05? 17:57, Wanpeng Li wrote: > Hi Xinhui, > 2016-06-28 22:43 GMT+08:00 Pan Xinhui <xinhui.pan at linux.vnet.ibm.com>: >> This is to fix some lock holder preemption issues. Some other locks >> implementation do a spin loop before acquiring the lock itself. Current...

On 2017/11/14 15:12, Wanpeng Li wrote: > 2017-11-14 15:02 GMT+08:00 Quan Xu <quan.xu0 at gmail.com>: >> >> On 2017/11/13 18:53, Juergen Gross wrote: >>> On 13/11/17 11:06, Quan Xu wrote: >>>> From: Quan Xu <quan.xu0 at gmail.com> >>>> >>>> So far, pv_idle_...

On 2017/11/14 15:12, Wanpeng Li wrote: > 2017-11-14 15:02 GMT+08:00 Quan Xu <quan.xu0 at gmail.com>: >> >> On 2017/11/13 18:53, Juergen Gross wrote: >>> On 13/11/17 11:06, Quan Xu wrote: >>>> From: Quan Xu <quan.xu0 at gmail.com> >>>> >>>> So far, pv_idle_...

...rs more care about live migration downtime to avoid customers' > perception than total time, however, this feature will increase downtime > when acquire the benefit of reducing total time, maybe it will be more > acceptable if there is no downside for downtime. > > Regards, > Wanpeng Li In theory, there is no factor that will increase the downtime. There is no additional operation and no more data copy during the stop and copy stage. But in the test, the downtime increases and this can be reproduced. I think the busy network line maybe the reason for this. With this optimizat...

...rs more care about live migration downtime to avoid customers' > perception than total time, however, this feature will increase downtime > when acquire the benefit of reducing total time, maybe it will be more > acceptable if there is no downside for downtime. > > Regards, > Wanpeng Li In theory, there is no factor that will increase the downtime. There is no additional operation and no more data copy during the stop and copy stage. But in the test, the downtime increases and this can be reproduced. I think the busy network line maybe the reason for this. With this optimizat...

2016-07-07 17:42 GMT+08:00 Peter Zijlstra <peterz at infradead.org>: > On Thu, Jul 07, 2016 at 04:48:05PM +0800, Wanpeng Li wrote: >> 2016-07-06 20:28 GMT+08:00 Paolo Bonzini <pbonzini at redhat.com>: >> > Hmm, you're right. We can use bit 0 of struct kvm_steal_time's flags to >> > indicate that pad[0] is a "VCPU preempted" field; if pad[0] is 1, the >> > VCPU...

2016-07-06 20:28 GMT+08:00 Paolo Bonzini <pbonzini at redhat.com>: > > > On 06/07/2016 14:08, Wanpeng Li wrote: >> 2016-07-06 18:44 GMT+08:00 Paolo Bonzini <pbonzini at redhat.com>: >>> >>> >>> On 06/07/2016 08:52, Peter Zijlstra wrote: >>>> On Tue, Jun 28, 2016 at 10:43:07AM -0400, Pan Xinhui wrote: >>>>> change fomr v1: >>&gt...

2017-11-14 16:15 GMT+08:00 Quan Xu <quan.xu0 at gmail.com>: > > > On 2017/11/14 15:12, Wanpeng Li wrote: >> >> 2017-11-14 15:02 GMT+08:00 Quan Xu <quan.xu0 at gmail.com>: >>> >>> >>> On 2017/11/13 18:53, Juergen Gross wrote: >>>> >>>> On 13/11/17 11:06, Quan Xu wrote: >>>>> >>>>> From: Quan Xu...