what does nr_iowait_cpu() do?

[Mohammad Merajul Islam Molla]

Hi Andev,

Thanks for reply. I got the definition too. What I really want to know
is what this variable nr_iowait stands for?
Is it counting pending input/output on a cpu?


--
- Meraj



On Tue, Jul 15, 2014 at 8:07 AM, Andev <debiandev at gmail.com> wrote:
> On Mon, Jul 14, 2014 at 10:10 AM, Mohammad Merajul Islam Molla
> <meraj.enigma at gmail.com> wrote:
>> Hello,
>>
>> I was looking into the code of cpuidle menu governor and it uses a
>> function nr_iowait_cpu(int cpu).
>> I could not find out what this function does.
>>
>> Can someone please explain what nr_iowait_cpu(int cpu) and variant
>> nr_iowait() do?
>>
>> --
>
> In all its glory:
>
> unsigned long nr_iowait_cpu(int cpu)
> {
>     struct rq *this = cpu_rq(cpu);
>     return atomic_read(&this->nr_iowait);
> }
>
>
>> Thanks,
>> -Meraj
>>
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>
>
>
> --
> Andev