* how set_user_nice() function is called
@ 2011-11-20 17:31 Enes Albay - انس الباى
2011-11-21 1:59 ` Mulyadi Santosa
0 siblings, 1 reply; 4+ messages in thread
From: Enes Albay - انس الباى @ 2011-11-20 17:31 UTC (permalink / raw)
To: kernelnewbies
Hi!
anybody knows that where is set_user_nice() function called in the kernel?
i couldn't find that. i just found that in forking operation
do_fork()->copy_process()->
dup_task_struct() called then set_user_nice()
called but i couldn't find that where. Also how/where do_fork() function
called in kernel i couldn't find.
Thanks in advance...
--
Enes Albay
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* how set_user_nice() function is called
2011-11-20 17:31 how set_user_nice() function is called Enes Albay - انس الباى
@ 2011-11-21 1:59 ` Mulyadi Santosa
2011-11-22 10:23 ` Enes Albay - انس الباى
0 siblings, 1 reply; 4+ messages in thread
From: Mulyadi Santosa @ 2011-11-21 1:59 UTC (permalink / raw)
To: kernelnewbies
On Mon, Nov 21, 2011 at 00:31, Enes Albay - ??? ?????
<albayenes@gmail.com> wrote:
> Hi!
>
> anybody knows that where is set_user_nice() function called in the kernel?
> i couldn't find that. ?i just found that in forking operation
> do_fork()->copy_process()->
> dup_task_struct() called then set_user_nice()
> called but i couldn't find that where. Also how/where do_fork() function
> called in kernel i couldn't find.
In x86, do_fork() is called from sys_fork()... check :
http://lxr.linux.no/#linux+v3.1.1/arch/x86/kernel/process.c#L235
While sys_fork() itself, since it's a syscall handler, is called from
entry.S. Please refer to:
http://lxr.linux.no/#linux+v3.1.1/arch/x86/ia32/ia32entry.S#L475
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
^ permalink raw reply [flat|nested] 4+ messages in thread
* how set_user_nice() function is called
2011-11-21 1:59 ` Mulyadi Santosa
@ 2011-11-22 10:23 ` Enes Albay - انس الباى
2011-11-23 8:55 ` rohan puri
0 siblings, 1 reply; 4+ messages in thread
From: Enes Albay - انس الباى @ 2011-11-22 10:23 UTC (permalink / raw)
To: kernelnewbies
Thanks for reply.
I also asked that set_user_nice where and when is called(file and line). I
think it is not called after each forking operation, isn't it? Could you
give calling order between functions from do_fork() like that
func1()->func2()->...
Regards.
On Mon, Nov 21, 2011 at 3:59 AM, Mulyadi Santosa
<mulyadi.santosa@gmail.com>wrote:
> On Mon, Nov 21, 2011 at 00:31, Enes Albay - ??? ?????
> <albayenes@gmail.com> wrote:
> > Hi!
> >
> > anybody knows that where is set_user_nice() function called in the
> kernel?
> > i couldn't find that. i just found that in forking operation
> > do_fork()->copy_process()->
> > dup_task_struct() called then set_user_nice()
> > called but i couldn't find that where. Also how/where do_fork() function
> > called in kernel i couldn't find.
>
> In x86, do_fork() is called from sys_fork()... check :
> http://lxr.linux.no/#linux+v3.1.1/arch/x86/kernel/process.c#L235
>
> While sys_fork() itself, since it's a syscall handler, is called from
> entry.S. Please refer to:
> http://lxr.linux.no/#linux+v3.1.1/arch/x86/ia32/ia32entry.S#L475
>
>
>
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>
--
Enes Albay
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* how set_user_nice() function is called
2011-11-22 10:23 ` Enes Albay - انس الباى
@ 2011-11-23 8:55 ` rohan puri
0 siblings, 0 replies; 4+ messages in thread
From: rohan puri @ 2011-11-23 8:55 UTC (permalink / raw)
To: kernelnewbies
On Tue, Nov 22, 2011 at 3:53 PM, Enes Albay - ??? ????? <albayenes@gmail.com
> wrote:
> Thanks for reply.
>
> I also asked that set_user_nice where and when is called(file and line).
> I think it is not called after each forking operation, isn't it? Could you
> give calling order between functions from do_fork() like that
> func1()->func2()->...
>
> Regards.
>
> On Mon, Nov 21, 2011 at 3:59 AM, Mulyadi Santosa <
> mulyadi.santosa at gmail.com> wrote:
>
>> On Mon, Nov 21, 2011 at 00:31, Enes Albay - ??? ?????
>> <albayenes@gmail.com> wrote:
>> > Hi!
>> >
>> > anybody knows that where is set_user_nice() function called in the
>> kernel?
>> > i couldn't find that. i just found that in forking operation
>> > do_fork()->copy_process()->
>> > dup_task_struct() called then set_user_nice()
>> > called but i couldn't find that where. Also how/where do_fork() function
>> > called in kernel i couldn't find.
>>
>> In x86, do_fork() is called from sys_fork()... check :
>> http://lxr.linux.no/#linux+v3.1.1/arch/x86/kernel/process.c#L235<http://lxr.linux.no/#linux+v3.1.1/arch/x86/kernel/process.c%23L235>
>>
>> While sys_fork() itself, since it's a syscall handler, is called from
>> entry.S. Please refer to:
>> http://lxr.linux.no/#linux+v3.1.1/arch/x86/ia32/ia32entry.S#L475<http://lxr.linux.no/#linux+v3.1.1/arch/x86/ia32/ia32entry.S%23L475>
>>
>>
>>
>> --
>> regards,
>>
>> Mulyadi Santosa
>> Freelance Linux trainer and consultant
>>
>> blog: the-hydra.blogspot.com
>> training: mulyaditraining.blogspot.com
>>
>
>
>
> --
> Enes Albay
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
> make use of cscope to get the locations from whr set_user_nice() is
called. I did egrep pattern search using cscope and could see it getting
called from many locations : -
0 loop.c 578 set_user_nice(current, -20);
1 nbd.c 505 set_user_nice(current, -20);
2 pktcdvd.c 1567 set_user_nice(current, -20);
3 ipmi_si_intf.c 1012 set_user_nice(current, 19);
4 dmatest.c 291 set_user_nice(current, 10);
5 ap_bus.c 1563 set_user_nice(current, 19);
6 bnx2fc_fcoe.c 436 set_user_nice(current, -20);
7 bnx2fc_fcoe.c 567 set_user_nice(current, -20);
8 fcoe.c 1646 set_user_nice(current, -20);
9 ibmvfc.c 4438 set_user_nice(current, -20);
a ibmvscsi.c 1891 set_user_nice(current, -20);
b lpfc_hbadisc.c 715 set_user_nice(current, -20);
c qla_os.c 3314 set_user_nice(current, -20);
d main.c 2322 set_user_nice(speakup_task, 10);
e target_core_transport.c 6091 set_user_nice(current, -20);
f tfc_cmd.c 702 set_user_nice(current, -20);
g fs-writeback.c 902 set_user_nice(current, 0);
h background.c 83 set_user_nice(current, 10);
i heartbeat.c 1093 set_user_nice(current, -20);
j sched.h 2037 extern void set_user_nice(struct task_struct
*p, long nice);
k exit.c 350 set_user_nice(current, 0);
l hung_task.c 195 set_user_nice(current, 0);
m kmod.c 157 set_user_nice(current, 0);
n rcutorture.c 867 set_user_nice(current, 19);
o rcutorture.c 910 set_user_nice(current, 19);
p rcutorture.c 993 set_user_nice(current, 19);
q rcutree_plugin.h 1452 set_user_nice(current, 19);
r rtmutex-tester.c 307 set_user_nice(current, 0);
s sched.c 4880 void set_user_nice(struct task_struct *p,
long nice)
t sched.c 4925 EXPORT_SYMBOL(set_user_nice);
u sched.c 4977 set_user_nice(current, nice);
v sched.c 8271 set_user_nice(p, 0);
w sys.c 168 set_user_nice(p, niceval);
x ring_buffer_benchmark.c 453 set_user_nice(consumer, consumer_nice);
y ring_buffer_benchmark.c 462 set_user_nice(producer, producer_nice);
z workqueue.c 2034 set_user_nice(current, RESCUER_NICE_LEVEL);
A backing-dev.c 272 set_user_nice(current, 0);
?????????,
???? ????
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2011-11-20 17:31 how set_user_nice() function is called Enes Albay - انس الباى
2011-11-21 1:59 ` Mulyadi Santosa
2011-11-22 10:23 ` Enes Albay - انس الباى
2011-11-23 8:55 ` rohan puri
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