Huge difference in build sizes

[Vinícius Tinti]

On Tue, Dec 2, 2014 at 10:37 AM, Raghavendra <arrao at cdac.in> wrote:
> Hello Tinti,
>
> Thank you for the reply.
>
> On Tuesday 02 December 2014 05:21 PM, Vinícius Tinti wrote:
>>
>> On Tue, Dec 2, 2014 at 7:08 AM, Raghavendra <arrao at cdac.in> wrote:
>>>
>>> Hello all,
>>>
>>> I am using Ubuntu-12.04 which came with 3.2 kernel. Parallel to this,
>>> I've compiled and installed 3.12.1 kernel using the Ubuntu-3.2's
>>> configuration, and the compiler which came with the distro. I've noticed
>>> that there is a huge difference in the size of the .ko file between the
>>> Ubuntu's kernel and the kernel which I've compiled. Sample results are :
>>>
>>> $ du -sh usb-storage.ko
>>> It shows : 56K for the Ubuntu's 3.2 kernel
>>>                   1.3M for the custom kernel that I've compiled
>>>
>>> I've tested the same thing for a simple hello world module :
>>> $ du -sh hello.ko
>>> It shows : 4.0k for the Ubuntu's 3.2 kernel
>>>                   56k for the custom kernel that I've compiled
>>>
>>> What could be the reason for this huge amount of difference of storage
>>> space in spite of using the same config file and compiler?
>>
>> Are you sure that you have build with the same optimization flags?
>>
>> I guess that "-O2" is missing in the big example. Could you double check?
>
> Actually, I haven't use any optimization flags. I've just hit 'make' from
> the command line while compiling for both the kernels. I even checked the
> Makefile of both the kernels. -O2 flag is used in the same way in both the
> Makefiles.

Strange. Can you try this?


> Regards,
> Raghavendra
>
>>
>> Regards
>>
>>> Thanks in advance.
>>>
>>> Raghavendra
>>>
>>>
>>> -------------------------------------------------------------------------------------------------------------------------------
>>> [ C-DAC is on Social-Media too. Kindly follow us at:
>>> Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ]
>>>
>>> This e-mail is for the sole use of the intended recipient(s) and may
>>> contain confidential and privileged information. If you are not the
>>> intended recipient, please contact the sender by reply e-mail and destroy
>>> all copies and the original message. Any unauthorized review, use,
>>> disclosure, dissemination, forwarding, printing or copying of this email
>>> is strictly prohibited and appropriate legal action will be taken.
>>>
>>> -------------------------------------------------------------------------------------------------------------------------------
>>>
>>>
>>> _______________________________________________
>>> Kernelnewbies mailing list
>>> Kernelnewbies at kernelnewbies.org
>>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
>
> -------------------------------------------------------------------------------------------------------------------------------
> [ C-DAC is on Social-Media too. Kindly follow us at:
> Facebook: https://www.facebook.com/CDACINDIA & Twitter: @cdacindia ]
>
> This e-mail is for the sole use of the intended recipient(s) and may
> contain confidential and privileged information. If you are not the
> intended recipient, please contact the sender by reply e-mail and destroy
> all copies and the original message. Any unauthorized review, use,
> disclosure, dissemination, forwarding, printing or copying of this email
> is strictly prohibited and appropriate legal action will be taken.
> -------------------------------------------------------------------------------------------------------------------------------
>



-- 
Simplicity is the ultimate sophistication