what is the function of do_softirq() ?

what is the function of do_softirq() ?

[horseriver]

hi:

   what is the function of do_softirq()?

   It is called by ksoftirqd() ,which is setup by :  kernel_thread(ksoftirqd, hcpu, CLONE_KERNEL) ;


thanks!

what is the function of do_softirq() ?

[Anuz Pratap Singh Tomar]

On Tue, Jan 15, 2013 at 6:31 AM, horseriver <horserivers@gmail.com> wrote:

> hi:
>
>    what is the function of do_softirq()?
>
>    It is called by ksoftirqd() ,which is setup by :
>  kernel_thread(ksoftirqd, hcpu, CLONE_KERNEL) ;
>
>
> Please read "Understanding the Linux Kernel" Chapter on Interrupts and
Section on Softirqs and tasklets.  Page number 171(might be different in
other editions) onwards.


thanks!
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>



-- 
Thank you
Warm Regards
Anuz
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what is the function of do_softirq() ?

[anish kumar]

On Wed, 2013-01-16 at 10:25 +0000, Anuz Pratap Singh Tomar wrote:
> 
> 
> On Tue, Jan 15, 2013 at 6:31 AM, horseriver <horserivers@gmail.com>
> wrote:
>         hi:
>         
>            what is the function of do_softirq()?
Softirq is basically same as bottom half except it is run in irq
context.So the question which comes to mind is why softirq?Softirqs can
run concurrently on several CPUs and that is why it used in networking.
There are other advantages also but it is mostly use case dependent.
>         
>            It is called by ksoftirqd() ,which is setup by :
>         kernel_thread(ksoftirqd, hcpu, CLONE_KERNEL) ; 
ksoftirq is a saviour thread which takes up the execution of softirq if
it finds out that softirq are executing one by one and thereby userspace
is not being scheduled or none of other task is getting executed.As
threads have low priority it lets other tasks run.
>         
> Please read "Understanding the Linux Kernel" Chapter on Interrupts and
> Section on Softirqs and tasklets.  Page number 171(might be different
> in other editions) onwards.
> 
> 
> 
>         thanks!
>         
>         _______________________________________________
>         Kernelnewbies mailing list
>         Kernelnewbies at kernelnewbies.org
>         http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
> 
> 
> 
> -- 
> Thank you 
> Warm Regards
> Anuz
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies

Kernel documentation

[shubham]

Hi All,

I want to know if we have some documentation of kernel which 
specifically shows function calls in kernel code (It might be in the 
form of flow charts).

I think we can use tools like doxygen.
Is there any work going on this ?

Regards
Shubham

Kernel documentation

[Anuz Pratap Singh Tomar]

On Wed, Jan 16, 2013 at 4:35 PM, shubham <kernel.shubham@gmail.com> wrote:

> Hi All,
>
> I want to know if we have some documentation of kernel which
> specifically shows function calls in kernel code (It might be in the
> form of flow charts).
>
> I think we can use tools like doxygen.
> Is there any work going on this ?
>
> This may be bit outdated
http://www.makelinux.net/kernel_map/

> Regards
> Shubham
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>



-- 
Thank you
Warm Regards
Anuz
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Kernel documentation

[Henrique Rodrigues]

Here is a good one for networking:
http://www.linuxfoundation.org/images/1/1c/Network_data_flow_through_kernel.png
I believe this is somewhat more up to date.

Perhaps the biggest problem is not building a diagram of kernel function
calls, but maintaining it over time.

On Wed, Jan 16, 2013 at 8:47 AM, Anuz Pratap Singh Tomar <
chambilkethakur@gmail.com> wrote:

>
>
> On Wed, Jan 16, 2013 at 4:35 PM, shubham <kernel.shubham@gmail.com> wrote:
>
>> Hi All,
>>
>> I want to know if we have some documentation of kernel which
>> specifically shows function calls in kernel code (It might be in the
>> form of flow charts).
>>
>> I think we can use tools like doxygen.
>> Is there any work going on this ?
>>
>> This may be bit outdated
> http://www.makelinux.net/kernel_map/
>
>> Regards
>> Shubham
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>
>
>
> --
> Thank you
> Warm Regards
> Anuz
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>


-- 
Henrique Rodrigues
http://www.dcc.ufmg.br/~hsr
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Kernel documentation

[Henrique Rodrigues]

I think a diagram of function calls would be too much to fit in a
reasonable sized diagram. I'm aware of diagrams of network function calls,
and they are already big.

You can use linux cross referencing (lxr) websites to follow function calls
or download lxr and build the same thing for your own source code.

I think you can also google diagrams of different kernel subsystems to find
useful diagrams.

On Wed, Jan 16, 2013 at 8:35 AM, shubham <kernel.shubham@gmail.com> wrote:

> Hi All,
>
> I want to know if we have some documentation of kernel which
> specifically shows function calls in kernel code (It might be in the
> form of flow charts).
>
> I think we can use tools like doxygen.
> Is there any work going on this ?
>
> Regards
> Shubham
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>



-- 
Henrique Rodrigues
http://www.dcc.ufmg.br/~hsr
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Kernel documentation

[Simon]

LXR is truly awesome!   8D

It clearly obsoletes grep for browsing and searching the kernel sources!

Thanks for sharing!

Simon


On Wed, Jan 16, 2013 at 11:57 AM, Henrique Rodrigues
<henriquesilvar@gmail.com> wrote:
> I think a diagram of function calls would be too much to fit in a reasonable
> sized diagram. I'm aware of diagrams of network function calls, and they are
> already big.
>
> You can use linux cross referencing (lxr) websites to follow function calls
> or download lxr and build the same thing for your own source code.
>
> I think you can also google diagrams of different kernel subsystems to find
> useful diagrams.
>
> On Wed, Jan 16, 2013 at 8:35 AM, shubham <kernel.shubham@gmail.com> wrote:
>>
>> Hi All,
>>
>> I want to know if we have some documentation of kernel which
>> specifically shows function calls in kernel code (It might be in the
>> form of flow charts).
>>
>> I think we can use tools like doxygen.
>> Is there any work going on this ?
>>
>> Regards
>> Shubham
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
>
>
> --
> Henrique Rodrigues
> http://www.dcc.ufmg.br/~hsr
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>