idle task check

[Mustafa Hussain]

Ok, everything is clear except one thing what we will do exactly with (pid)
s?
On 4 Jun 2015 15:40, "nick" <xerofoify at gmail.com> wrote:

>
>
> On 2015-06-04 08:34 AM, Mustafa Hussain wrote:
> > great, How can I check if this running task is used or not.. I mean by
> not
> > used that the task is running but not used by the user
> >
> >
> Here is the issue through in order to find out what tasks the user is
> running we
> need to known the exact pid(s) each time. This is next to impossible to do
> without
> writing a syscall and that’s a little beyond you if your asking about the
> scheduler.
> However, there may be a debugging feature in perf or other tool that does
> this, you
> can google to see if something wrote a tool or kernel module for this.
> Nick
> > On June 4, 2015 8:22:03 AM EDT, Mustafa Hussain <
> mustafa.hussain93 at gmail.com>
> > wrote:
> >> 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:
> >>
> > That's not a idle task,  that's a task in the
> > TASK_INTERRUPTIBLE  or TASK_RUNNING phase.
> > Nick
> >>>
> >>>
> >>> 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.
> >>>
> >
> > --
> > Sent from my Android device with K-9 Mail. Please excuse my brevity.
> >
>
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