idle task check

[Mustafa Hussain]

So I was just thinking about if i did this i can close apps that is running
and user don't use them..
On 4 Jun 2015 14:59, "Nicholas Krause" <xerofoify at gmail.com> wrote:

>
>
> On June 4, 2015 7:56:30 AM EDT, Mustafa Hussain <
> mustafa.hussain93 at gmail.com> wrote:
> >All i am trying to do is to detect idle task and remove it from the
> >running
> >queue or deactivate it.
> There is no reason  for that.  The idle tasks are only ever scheduled when
> there is no other processes able to
> run.  So trying to remove them is a
> bad idea.
> Nick
> >Thank you for your patience :)
> >On 4 Jun 2015 14:51, "Nicholas Krause" <xerofoify at gmail.com> wrote:
> >
> >>
> >>
> >> On June 4, 2015 3:35:25 AM EDT, Mustafa Hussain <
> >> mustafa.hussain93 at gmail.com> wrote:
> >> >System crashes,  system can not start
> >> >
> >> I was not thinking and this schedules the idle thread. What are you
> >trying
> >> to accomplish through.
> >> Nick
> >> >
> >> >On June 3, 2015 9:41:52 PM EDT, Mustafa Hussain
> >> ><mustafa.hussain93 at gmail.com>
> >> >wrote:
> >> >>i want to dequeue the idle task how can i do this ?
> >> >Why there is no point.  Clearly your asking questions in order to
> >learn
> >> >the
> >> >scheduler.
> >> >If your interested in learning it I  can help but,  you need to
> >think
> >> >about
> >> >what you
> >> > trying to accomplish first.
> >> >Nick
> >> >
> >> >>On Thu, Jun 4, 2015 at 3:40 AM, Mustafa Hussain
> >> >><mustafa.hussain93 at gmail.com
> >> >>> wrote:
> >> >>
> >> >>> Hi nick,
> >> >>> i applied your suggested edit and i got "bad: scheduling from the
> >> >>idle
> >> >>> thread!"
> >> >>> how can i solve this ?
> >> >>>
> >> >>> On Wed, Jun 3, 2015 at 12:29 AM, nick <xerofoify at gmail.com>
> >wrote:
> >> >>>
> >> >>>>
> >> >>>>
> >> >>>> On 2015-06-02 06:25 PM, Valdis.Kletnieks at vt.edu wrote:
> >> >>>> > On Tue, 02 Jun 2015 23:38:48 +0200, Mustafa Hussain said:
> >> >>>> >
> >> >>>> >>> /*Check if the pointer pointing to the idle class is equal
> >to
> >> >>prev's
> >> >>>> >>> sched_class*/
> >> >>>> >>> if(prev->sched_class == idle)
> >> >>>> >>> After this condition you can just:
> >> >>>> >>> printk(KERN_INFO "Prev is equal to idle_sched_class,now
> >running
> >> >>the
> >> >>>> idle
> >> >>>> >>> sched_class\n");
> >> >>>> >
> >> >>>> > Hopefully, you didn't take Nick's advice without thinking
> >about
> >> >>it....
> >> >>>> >
> >> >>>> > As I type this, powertop tells me:
> >> >>>> >
> >> >>>> > Summary: 821.8 wakeups/second,  0.0 GPU ops/seconds, 0.0 VFS
> >> >>ops/sec
> >> >>>> and 18.8% CPU use
> >> >>>> >
> >> >>>> > That printk is going to spam your dmesg pretty hard.
> >> >>>> >
> >> >>>> > A better question is:
> >> >>>> >
> >> >>>> > If prev is about to go idle, *what do you want to do*?  (Hint:
> >> >>newer
> >> >>>> > kernels already do a bunch of stuff when a cpu/core goes idle,
> >> >you
> >> >>>> > probably want to make sure you're not working against
> >something
> >> >>here...)
> >> >>>> >
> >> >>>> I didn't account for rate limiting the debug messages, forgot
> >about
> >> >>that
> >> >>>> . :)
> >> >>>> I do agree his question is not the best but he wanted a answer
> >so I
> >> >>>> decided
> >> >>>> to just give him a answer that works for his learning.
> >> >>>> Nick
> >> >>>>
> >> >>>
> >> >>>
> >> >
> >> >--
> >> >Sent from my Android device with K-9 Mail. Please excuse my brevity.
> >>
> >> --
> >> Sent from my Android device with K-9 Mail. Please excuse my brevity.
> >>
>
> --
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
>
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