On 18 November 2014 11:47, Wanpeng Li wrote:
> Hi Vincent,
> On 10/31/14, 4:47 PM, Vincent Guittot wrote:
>>
>> When a CPU is used to handle a lot of IRQs or some RT tasks, the remaining
>> capacity for CFS tasks can be significantly reduced. Once we detect such
>
>
> I see the cpu capacity will b
Hi Vincent,
On 10/31/14, 4:47 PM, Vincent Guittot wrote:
When a CPU is used to handle a lot of IRQs or some RT tasks, the remaining
capacity for CFS tasks can be significantly reduced. Once we detect such
I see the cpu capacity will be reduced if RT tasks are running in
scale_rt_capacity(), co
On 4 November 2014 14:31, Hillf Danton wrote:
>> >> > I wonder if you can please shed light on the case that
>> >> > the dst_cpu is newly idle.
>> >>
>> >> The main problem if we do the test only for newly idle case, is that
>> >> we are not sure to move the task because we must rely on the
>> >>
> >> > I wonder if you can please shed light on the case that
> >> > the dst_cpu is newly idle.
> >>
> >> The main problem if we do the test only for newly idle case, is that
> >> we are not sure to move the task because we must rely on the
> >> wakeup/sleep sequence of other tasks on an idle CPU i
On 4 November 2014 13:54, Hillf Danton wrote:
>>
>> On 4 November 2014 13:07, Hillf Danton wrote:
>> >> >> + /*
>> >> >> +* The dst_cpu is idle and the src_cpu CPU has only 1 CFS task.
>> >> >
>> >> >
>> >> > Why specify one task instead of not less than one?
>> >>
>> >> if cfs.h_nr
>
> On 4 November 2014 13:07, Hillf Danton wrote:
> >> >> + /*
> >> >> +* The dst_cpu is idle and the src_cpu CPU has only 1 CFS task.
> >> >
> >> >
> >> > Why specify one task instead of not less than one?
> >>
> >> if cfs.h_nr_running = 0 (which should not occurs at that point), w
On 4 November 2014 13:07, Hillf Danton wrote:
>> >> + /*
>> >> +* The dst_cpu is idle and the src_cpu CPU has only 1 CFS task.
>> >
>> >
>> > Why specify one task instead of not less than one?
>>
>> if cfs.h_nr_running = 0 (which should not occurs at that point), we
>> don't need to
> >> + /*
> >> +* The dst_cpu is idle and the src_cpu CPU has only 1 CFS task.
> >
> >
> > Why specify one task instead of not less than one?
>
> if cfs.h_nr_running = 0 (which should not occurs at that point), we
> don't need to do more test to check if it's worth moving the task
>
On 4 November 2014 11:42, Wanpeng Li wrote:
> Hi Vincent,
>
+
+/*
* Group imbalance indicates (and tries to solve) the problem where
balancing
* groups is inadequate due to tsk_cpus_allowed() constraints.
*
@@ -6562,6 +6574,28 @@ static int need_activ
Hi Vincent,
On 14/11/4 下午5:41, Vincent Guittot wrote:
On 4 November 2014 09:30, Wanpeng Li wrote:
On 14/10/31 下午4:47, Vincent Guittot wrote:
When a CPU is used to handle a lot of IRQs or some RT tasks, the remaining
capacity for CFS tasks can be significantly reduced. Once we detect such
situa
On 4 November 2014 09:30, Wanpeng Li wrote:
>
> On 14/10/31 下午4:47, Vincent Guittot wrote:
>>
>> When a CPU is used to handle a lot of IRQs or some RT tasks, the remaining
>> capacity for CFS tasks can be significantly reduced. Once we detect such
>> situation by comparing cpu_capacity_orig and cp
On 14/10/31 下午4:47, Vincent Guittot wrote:
When a CPU is used to handle a lot of IRQs or some RT tasks, the remaining
capacity for CFS tasks can be significantly reduced. Once we detect such
situation by comparing cpu_capacity_orig and cpu_capacity, we trig an idle
load balance to check if it's
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