Linux Kernel

Linux Kernel

[Marcondes Monteiro de Arau]

Hi!

I'm university student in Brazil and would like to know if during the process of compilation of the kernel of the linux the tecnology of cluster is used.



Marcondes

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Re: Linux Kernel

[Matan Peled]

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Marcondes Monteiro de Arau wrote:
> Hi!
> 
> I'm university student in Brazil and would like to know if during the process of compilation of the kernel of the linux the tecnology of cluster is used.
> 
> 
> 
> Marcondes
> 

Are you talking about using a cluster to compile the kernel? In that case,
Google for DistCC.

Are you asking if a compiled linux kernel can be used as part of a cluster?
openMosix is the project you're searching for.

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Re: Linux Kernel

[Justin P. Mattock]

On 10/23/2012 04:32 AM, Dwiastika Peppy wrote:
> Hai Justin. My name is Peppy
> I wanna ask you about installing Linux Kernel 2.6.27
> I'm a newbie in Linux user
> I got problem when installed Linux Kernel and this is the problem :
> *scripts/unifdef.c:209: error: conflicting types for ‘getline’
> /usr/include/stdio.h:651: note: previous declaration of ‘getline’ was here
> make[2]: *** [scripts/unifdef] Error 1
> make[1]: *** [__headers] Error 2
> make: *** [vmlinux] Error 2*
>
> what should i do to solve this problem?
> maybe you can help me..
> Thank you before Justin
>
> Best Regards,
>
>
> Peppy


from what I remember libc made the change then everything else had to be 
fixed. this commit is the commit which fixes it:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=d15bd1067b1fcb2b7250d22bc0c7c7fea0b759f7

but after thinking this over we probably should have done a
get_line || getline();
so old and new can always be working for people using older kernels and 
in the event of bisecting. but then again we might have more of a 
bloated kernel if we did this approach to _every_ function definition 
rename in the kernel.

anyway hope this helps with your build experience of the kernel.

Justin P. Mattock

Linux Kernel

[kapil agrawal]

Hi,

How the linux kernel runs in the system after spawning the init and
mounting the root FS.
Does it run as some background process ?
How it serves the system calls etc. ?

Regards
Kapil
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Linux Kernel

[Valdis.Kletnieks at vt.edu]

On Tue, 19 Feb 2013 10:50:26 +0530, kapil agrawal said:

> How the linux kernel runs in the system after spawning the init and
> mounting the root FS.
> Does it run as some background process ?

No.  You probably want to get some basic knowledge about operating
systems in general.

http://en.wikipedia.org/wiki/Operating_system

as you appear to be confused regarding the basic concepts of an
operating systems kernel.

> How it serves the system calls etc. ?

There's about 5 different answers to that, depending on how in-depth
you want the details, but I suspect that none of them will make any sense
to you until you get a better grasp on the basics....
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Linux Kernel

[Sengottuvelan S]

Kapil

It runs as Background process in the kernel memory (init-process). When
system calls is coming from User space/Land, there will be context switch
from user to kernel space happens. I think kernel main thread serving those
system calls.

On Mon, Feb 18, 2013 at 9:20 PM, kapil agrawal <kapil.agrawal81@gmail.com>wrote:

> Hi,
>
> How the linux kernel runs in the system after spawning the init and
> mounting the root FS.
> Does it run as some background process ?
> How it serves the system calls etc. ?
>
> Regards
> Kapil
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>


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Regards,
S. Sengottuvelan.
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Linux Kernel

[kapil agrawal]

Do you mean process with PID 0 is the one, which runs in the background and
serves the request from userland and goes to cpu_idle() if nothing to run.

-kapil


On Tue, Feb 19, 2013 at 11:23 AM, Sengottuvelan S <sengottuvelan.s@gmail.com
> wrote:

> Kapil
>
> It runs as Background process in the kernel memory (init-process). When
> system calls is coming from User space/Land, there will be context switch
> from user to kernel space happens. I think kernel main thread serving those
> system calls.
>
> On Mon, Feb 18, 2013 at 9:20 PM, kapil agrawal <kapil.agrawal81@gmail.com>wrote:
>
>> Hi,
>>
>> How the linux kernel runs in the system after spawning the init and
>> mounting the root FS.
>> Does it run as some background process ?
>> How it serves the system calls etc. ?
>>
>> Regards
>> Kapil
>>
>> _______________________________________________
>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>>
>>
>
>
> --
> Regards,
> S. Sengottuvelan.
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Linux Kernel

[Valdis.Kletnieks at vt.edu]

On Tue, 19 Feb 2013 12:01:55 +0530, kapil agrawal said:

> Do you mean process with PID 0 is the one, which runs in the background and
> serves the request from userland and goes to cpu_idle() if nothing to run.

No.  Large parts of the kernel run in kernel mode, but using the 'struct task'
of the related userspace process (in particular, most system calls work
this way).  Other large chunks borrow the 'struct task' and run under it
just so there's *a* process running.  And parts aren't in process context
at all, but interrupt context (so they aren't running as process code at all).
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