scheduler help

scheduler help

[alexis]

hello to everyone ,
l have a assignment and i need help.
i have to change the scheduler function at kernel  2.6.38 so  that the 
scheduler choose the process
with the least slack time.

My problem :
i have create a function that iterates all runnable processes  finds the 
one with least slack time(lst)
and returns a pointer  to the task( struct task_struct*)
Now i need to change the scheduler so that  selected for execution the  
process with lst.

i am trying to change the function pick_next_task_fair in file sched_fair.c
but i cant understand the code in there can someone explain me ?

is the pick_next_task_fair the right function that need change?
if yes it is the only one ?

sorry for my English
thanks.

scheduler help

[Henry Hallam]

Your English is fine.

Use a modern kernel, nobody wants to support development of 2.6.x.
It's nearly four years old.

sched_fair.c was moved to kernel/sched/fair.c in 2011, prior to
release of version 3.3.  It has had 345 changes since then.

I realize this is for a class; you should tell your instructor that
they should update the course to use a modern kernel version.  If
enough people do that, maybe it will eventually happen.

Good luck,
Henry

On Mon, Dec 8, 2014 at 5:48 AM, alexis <akavroulakis@gmail.com> wrote:
> hello to everyone ,
> l have a assignment and i need help.
> i have to change the scheduler function at kernel  2.6.38 so  that the
> scheduler choose the process
> with the least slack time.
>
> My problem :
> i have create a function that iterates all runnable processes  finds the
> one with least slack time(lst)
> and returns a pointer  to the task( struct task_struct*)
> Now i need to change the scheduler so that  selected for execution the
> process with lst.
>
> i am trying to change the function pick_next_task_fair in file sched_fair.c
> but i cant understand the code in there can someone explain me ?
>
> is the pick_next_task_fair the right function that need change?
> if yes it is the only one ?
>
> sorry for my English
> thanks.
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

scheduler help

[Valdis.Kletnieks at vt.edu]

On Mon, 08 Dec 2014 10:58:03 -0800, you said:
> Use a modern kernel, nobody wants to support development of 2.6.x.
> It's nearly four years old.

More correctly, nobody wants to support 2.6.x *for free*.  There's plenty of
people who work for distros who will support 2.6.x if you pay them in the form
of buying a support contract....

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scheduler help

[Anish Kumar]

I am sure you can get help in Linux mailing list as kernel newbies list would not be be able to answer this.I think there is specific scheduler mailing list.



> On Dec 8, 2014, at 5:48 AM, alexis <akavroulakis@gmail.com> wrote:
> 
> hello to everyone ,
> l have a assignment and i need help.
> i have to change the scheduler function at kernel  2.6.38 so  that the 
> scheduler choose the process
> with the least slack time.
> 
> My problem :
> i have create a function that iterates all runnable processes  finds the 
> one with least slack time(lst)
> and returns a pointer  to the task( struct task_struct*)
> Now i need to change the scheduler so that  selected for execution the  
> process with lst.
> 
> i am trying to change the function pick_next_task_fair in file sched_fair.c
> but i cant understand the code in there can someone explain me ?
> 
> is the pick_next_task_fair the right function that need change?
> if yes it is the only one ?
> 
> sorry for my English
> thanks.
> 
> 
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

scheduler help

[Greg KH]

On Mon, Dec 08, 2014 at 03:12:24PM -0800, Anish Kumar wrote:
> I am sure you can get help in Linux mailing list as kernel newbies
> list would not be be able to answer this.I think there is specific
> scheduler mailing list.

People do not answer other people's homework questions on public mailing
lists.  Or they do so in ways that guarantee they will get a bad grade,
so beware...