ACK: Please drop CONFIG_LATENCYTOP

[Chris J Arges]

I built a test kernel with this disabled and free reports slightly more
memory available. I think its reasonable to disable this.
ACK.
--chris

On 07/08/2014 09:35 AM, Colin Ian King wrote:
> On 07/07/14 16:02, Tim Gardner wrote:
>> On 07/07/2014 01:32 PM, Rasmus Villemoes wrote:
>>> Hi,
>>>
>>> This is a proposal to drop CONFIG_LATENCYTOP=y from Ubuntu's kernel
>>> config. It increases the size of struct task_struct by almost a page
>>> (3848 bytes to be precise; this is on x86_64), which is an increase of
>>> about 170%. This precious kernel memory is almost never used for
>>> anything.
>>>
>>> If the popcon numbers are representative, less than 0.1% of the Ubuntu
>>> users have even installed the userspace frontend package latencytop, and
>>> of these, most never use it.
>>>
>>> I think it is a safe bet that a developer capable of interpreting and
>>> making use of the latencytop output would also be able to compile the
>>> kernel with a custom .config.
>>>
>>> Thanks,
>>> Rasmus
>>>
>>
>> Seems reasonable.
>>
>> Colin - do you have any thoughts ?
>>
> I agree, it makes sense to turn this off; the overhead does not justify
> the convenience for such a small number of users.
> 
> Thanks Rasmus for the analysis.
> 
> Colin
>