Difference between System.map and /proc/kallsyms

Difference between System.map and /proc/kallsyms

[Jamal]

Hi..

After reading Documentation on System.map, i understood that , whenever 
an oops happens the following addresses  will be converted to its 
function name by klogd daemon using System.map.

Now when we have /proc/kallsyms which stores the symbol table in the 
kernel image itself.Then what is the need of System.map file??Is any 
process or daemon still using it??

Regards,
Md.Jamal

Difference between System.map and /proc/kallsyms

[Anupam Kapoor]

>>>>> [2015-03-09T11:30:00+0530]: "Jamal" (Jamal):
,----[ Jamal ]
| Hi..
| 
| After reading Documentation on System.map, i understood that , whenever 
| an oops happens the following addresses  will be converted to its 
| function name by klogd daemon using System.map.
| 
| Now when we have /proc/kallsyms which stores the symbol table in the 
| kernel image itself.Then what is the need of System.map file??Is any 
| process or daemon still using it??
`----
oldish, but quite useful: http://www.dirac.org/linux/system.map/

---
thanks
anupam

Difference between System.map and /proc/kallsyms

[Arshad Hussain]

On 08-Mar-2015, at 11:00 pm, Jamal <md.jamalmohiuddin@gmail.com> wrote:

> Hi..
> 
> After reading Documentation on System.map, i understood that , whenever 
> an oops happens the following addresses  will be converted to its 
> function name by klogd daemon using System.map.
> 
> Now when we have /proc/kallsyms which stores the symbol table in the 
> kernel image itself.Then what is the need of System.map file??Is any 
> process or daemon still using it??

My 2 cents. 

No.

However, Since kallsyms bloats the kernel and makes it larger production kernel may not have it. 
In such case it will rely on System.map and ksymsoops for decoding oops messages.

> 
> Regards,
> Md.Jamal

Thanks 

> 
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> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
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Difference between System.map and /proc/kallsyms

[Nicholas Krause]

On March 9, 2015 10:07:28 PM EDT, Arshad Hussain <arshad.super@gmail.com> wrote:
>
>On 08-Mar-2015, at 11:00 pm, Jamal <md.jamalmohiuddin@gmail.com> wrote:
>
>> Hi..
>> 
>> After reading Documentation on System.map, i understood that ,
>whenever 
>> an oops happens the following addresses  will be converted to its 
>> function name by klogd daemon using System.map.
>> 
>> Now when we have /proc/kallsyms which stores the symbol table in the 
>> kernel image itself.Then what is the need of System.map file??Is any 
>> process or daemon still using it??
>
>My 2 cents. 
>
>No.
>
>However, Since kallsyms bloats the kernel and makes it larger
>production kernel may not have it. 
>In such case it will rely on System.map and ksymsoops for decoding oops
>messages.
>
>> 
>> Regards,
>> Md.Jamal
>
>Thanks 
>
>> 
MD. Jamal, 
You are 100 percent correct here adding features related to kernel debugging can easily bloat the kernel be a few gigabytes installed, easily terrible for any production where the storage space can be better used for various other applications or even important debugging log files. 
Nick 
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>> Kernelnewbies mailing list
>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
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