On Thu, 16 Jan 2014, Daniel Lezcano wrote:
> The question raised when I looked closely how to fully integrate cpuidle with
> the scheduler; in particular, the idle time.
> The scheduler idle time is not the same than the cpuidle idle time.
> A cpu can be idle for the scheduler 1s but it could be i
On 01/16/2014 12:38 PM, Peter Zijlstra wrote:
On Thu, Jan 16, 2014 at 12:03:13PM +0100, Daniel Lezcano wrote:
Hi Alex,
it is a nice optimization attempt but I agree with Peter we should focus on
integrating cpuidle.
The question is "how do we integrate cpuidle ?"
IMHO, the main problem are th
On Thu, Jan 16, 2014 at 12:03:13PM +0100, Daniel Lezcano wrote:
> Hi Alex,
>
> it is a nice optimization attempt but I agree with Peter we should focus on
> integrating cpuidle.
>
> The question is "how do we integrate cpuidle ?"
>
> IMHO, the main problem are the governors, especially the menu
On 01/15/2014 03:37 PM, Alex Shi wrote:
On 01/15/2014 03:35 PM, Peter Zijlstra wrote:
On Wed, Jan 15, 2014 at 12:07:59PM +0800, Alex Shi wrote:
Currently we just try to find least load cpu. If some cpus idled,
we just pick the first cpu in cpu mask.
In fact we can get the interrupted idle cpu
On 01/15/2014 03:35 PM, Peter Zijlstra wrote:
> On Wed, Jan 15, 2014 at 12:07:59PM +0800, Alex Shi wrote:
>> Currently we just try to find least load cpu. If some cpus idled,
>> we just pick the first cpu in cpu mask.
>>
>> In fact we can get the interrupted idle cpu or the latest idled cpu,
>> the
On 01/15/2014 04:05 PM, Michael wang wrote:
> On 01/15/2014 02:45 PM, Alex Shi wrote:
> [snip]
>>
>> yes, to save your scenario, we need to know the next timer for idle cpu,
>> but that is not enough, interrupt is totally unpredictable. So, I'd
>> rather bear the coarse method now.
>>>
>>> So what
On 01/15/2014 02:45 PM, Alex Shi wrote:
[snip]
>
> yes, to save your scenario, we need to know the next timer for idle cpu,
> but that is not enough, interrupt is totally unpredictable. So, I'd
> rather bear the coarse method now.
>>
>> So what about just check 'ts->tick_stopped' and record one ti
On Wed, Jan 15, 2014 at 12:07:59PM +0800, Alex Shi wrote:
> Currently we just try to find least load cpu. If some cpus idled,
> we just pick the first cpu in cpu mask.
>
> In fact we can get the interrupted idle cpu or the latest idled cpu,
> then we may get the benefit from both latency and power
On 01/15/2014 01:33 PM, Michael wang wrote:
> On 01/15/2014 12:07 PM, Alex Shi wrote:
>> > Currently we just try to find least load cpu. If some cpus idled,
>> > we just pick the first cpu in cpu mask.
>> >
>> > In fact we can get the interrupted idle cpu or the latest idled cpu,
>> > then we may
On 01/15/2014 12:07 PM, Alex Shi wrote:
> Currently we just try to find least load cpu. If some cpus idled,
> we just pick the first cpu in cpu mask.
>
> In fact we can get the interrupted idle cpu or the latest idled cpu,
> then we may get the benefit from both latency and power.
> The selected c
On 01/15/2014 12:53 PM, Alex Shi wrote:
>>> >> I guess we missed some code for latest_wake here?
>> >
>> > Yes, thanks for reminder!
>> >
>> > so updated patch:
>> >
> ops, still incorrect. re-updated:
update to wrong file. re-re-update. :(
===
>From b75e43bb77df14e2209532c1e5c48e0e03afa414 M
On 01/15/2014 12:48 PM, Alex Shi wrote:
> On 01/15/2014 12:31 PM, Michael wang wrote:
>> Hi, Alex
>>
>> On 01/15/2014 12:07 PM, Alex Shi wrote:
>> [snip] }
>>> +#ifdef CONFIG_NO_HZ_COMMON
>>> + /*
>>> +* Coarsely to get the latest idle cpu for shorter latency and
On 01/15/2014 12:31 PM, Michael wang wrote:
> Hi, Alex
>
> On 01/15/2014 12:07 PM, Alex Shi wrote:
> [snip]}
>> +#ifdef CONFIG_NO_HZ_COMMON
>> +/*
>> + * Coarsely to get the latest idle cpu for shorter latency and
>> + * possible power benefit.
>
Hi, Alex
On 01/15/2014 12:07 PM, Alex Shi wrote:
[snip] }
> +#ifdef CONFIG_NO_HZ_COMMON
> + /*
> + * Coarsely to get the latest idle cpu for shorter latency and
> + * possible power benefit.
> + */
> + if (!min_load) {
> +
Currently we just try to find least load cpu. If some cpus idled,
we just pick the first cpu in cpu mask.
In fact we can get the interrupted idle cpu or the latest idled cpu,
then we may get the benefit from both latency and power.
The selected cpu maybe not the best, since other cpu may be interr
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