similar to: [PATCH RFC v3 0/6] x86/idle: add halt poll support

From: Yang Zhang <yang.zhang.wz at gmail.com> Some latency-intensive workload have seen obviously performance drop when running inside VM. The main reason is that the overhead is amplified when running inside VM. The most cost I have seen is inside idle path. This patch introduces a new mechanism to poll for a while before entering idle state. If schedule is needed during poll, then we

From: Yang Zhang <yang.zhang.wz at gmail.com> Some latency-intensive workload have seen obviously performance drop when running inside VM. The main reason is that the overhead is amplified when running inside VM. The most cost I have seen is inside idle path. This patch introduces a new mechanism to poll for a while before entering idle state. If schedule is needed during poll, then we

From: Yang Zhang <yang.zhang.wz at gmail.com> Some latency-intensive workload have seen obviously performance drop when running inside VM. The main reason is that the overhead is amplified when running inside VM. The most cost I have seen is inside idle path. This patch introduces a new mechanism to poll for a while before entering idle state. If schedule is needed during poll, then we

From: Yang Zhang <yang.zhang.wz at gmail.com> Some latency-intensive workload have seen obviously performance drop when running inside VM. The main reason is that the overhead is amplified when running inside VM. The most cost I have seen is inside idle path. This patch introduces a new mechanism to poll for a while before entering idle state. If schedule is needed during poll, then we

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_ops.poll is the only ops for pv_idle. .poll is called >>>>

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_ops.poll is the only ops for pv_idle. .poll is called >>>>

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:

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_ops.poll is the only ops for pv_idle. .poll is called >> in idle path which will poll for a while before we enter the real idle >> state. >> >> In virtualization, idle path includes several heavy operations

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_ops.poll is the only ops for pv_idle. .poll is called >> in idle path which will poll for a while before we enter the real idle >> state. >> >> In virtualization, idle path includes several heavy operations

On 2017/11/14 15:30, Juergen Gross wrote: > On 14/11/17 08:02, Quan Xu wrote: >> >> 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_ops.poll is the only ops for pv_idle. .poll is called >>>> in idle path which will poll

On 2017/11/14 15:30, Juergen Gross wrote: > On 14/11/17 08:02, Quan Xu wrote: >> >> 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_ops.poll is the only ops for pv_idle. .poll is called >>>> in idle path which will poll

On 2017/11/14 18:27, Juergen Gross wrote: > On 14/11/17 10:38, Quan Xu wrote: >> >> On 2017/11/14 15:30, Juergen Gross wrote: >>> On 14/11/17 08:02, Quan Xu wrote: >>>> 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> >>>>>>

On 2017/11/14 18:27, Juergen Gross wrote: > On 14/11/17 10:38, Quan Xu wrote: >> >> On 2017/11/14 15:30, Juergen Gross wrote: >>> On 14/11/17 08:02, Quan Xu wrote: >>>> 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> >>>>>>

On 2017-11-16 17:53, Thomas Gleixner wrote: > On Thu, 16 Nov 2017, Quan Xu wrote: >> On 2017-11-16 06:03, Thomas Gleixner wrote: >> --- a/drivers/cpuidle/cpuidle.c >> +++ b/drivers/cpuidle/cpuidle.c >> @@ -210,6 +210,13 @@ int cpuidle_enter_state(struct cpuidle_device *dev, >> struct cpuidle_driver *drv, >> ??????????????? target_state =

On 2017-11-16 17:53, Thomas Gleixner wrote: > On Thu, 16 Nov 2017, Quan Xu wrote: >> On 2017-11-16 06:03, Thomas Gleixner wrote: >> --- a/drivers/cpuidle/cpuidle.c >> +++ b/drivers/cpuidle/cpuidle.c >> @@ -210,6 +210,13 @@ int cpuidle_enter_state(struct cpuidle_device *dev, >> struct cpuidle_driver *drv, >> ??????????????? target_state =

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_ops.poll is the only ops for pv_idle. .poll is called >>> in idle path which will poll for a while

On 2017-11-16 06:03, Thomas Gleixner wrote: > On Wed, 15 Nov 2017, Peter Zijlstra wrote: > >> On Mon, Nov 13, 2017 at 06:06:02PM +0800, Quan Xu wrote: >>> From: Yang Zhang <yang.zhang.wz at gmail.com> >>> >>> Implement a generic idle poll which resembles the functionality >>> found in arch/. Provide weak arch_cpu_idle_poll function which

On 14/11/17 08:02, Quan Xu wrote: > > > 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_ops.poll is the only ops for pv_idle. .poll is called >>> in idle path which will poll for a while before we enter the real idle >>> state.

On 14/11/17 10:38, Quan Xu wrote: > > > On 2017/11/14 15:30, Juergen Gross wrote: >> On 14/11/17 08:02, Quan Xu wrote: >>> >>> 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_ops.poll is the only

On 14/11/17 12:43, Quan Xu wrote: > > > On 2017/11/14 18:27, Juergen Gross wrote: >> On 14/11/17 10:38, Quan Xu wrote: >>> >>> On 2017/11/14 15:30, Juergen Gross wrote: >>>> On 14/11/17 08:02, Quan Xu wrote: >>>>> On 2017/11/13 18:53, Juergen Gross wrote: >>>>>> On 13/11/17 11:06, Quan Xu wrote: