On Fri, May 4, 2012 at 5:20 AM, Balbir Singh <email address hidden> wrote:
> On Thu, May 3, 2012 at 11:59 PM, Christian Kujau
> <email address hidden> wrote:
>> Whooha, language!
>>
>> And I think they "fixed" it, albeit in a weird way:
>> CONFIG_TASK_DELAY_ACCT is enabled in the kernel config, but the feature
>> is still disabled unless the kernel is booted with "delayacct" as a boot
>> parameter, see my comment above.
>>
>
> I am not sure who made the decision and on what data, but
> TASK_DELAY_ACCT should be the least of the problems when it comes to
> overheads.
>
> The correct path IMHO is to show us the overhead and lets fix it if it
> is unacceptable
>
Decision was totally right. One should NOT change behavior of kernel
in the middle of LTS lifecycle (e.g. like it was done to
CONFIG_NET_NS). Of cause it seems kinda strange that CONFIG_SCHEDSTATS
is set to "y" and we are talking about CONFIG_TASK_DELAY_ACCT
overhead.
And yes, at least some numbers would be nice (esp. form Nicholas
Janssen (xnicholas) who says that there is no overhead on his
workload).
On Fri, May 4, 2012 at 5:20 AM, Balbir Singh <email address hidden> wrote: TASK_DELAY_ ACCT is enabled in the kernel config, but the feature TASK_DELAY_ ACCT
> On Thu, May 3, 2012 at 11:59 PM, Christian Kujau
> <email address hidden> wrote:
>> Whooha, language!
>>
>> And I think they "fixed" it, albeit in a weird way:
>> CONFIG_
>> is still disabled unless the kernel is booted with "delayacct" as a boot
>> parameter, see my comment above.
>>
>
> I am not sure who made the decision and on what data, but
> TASK_DELAY_ACCT should be the least of the problems when it comes to
> overheads.
>
> The correct path IMHO is to show us the overhead and lets fix it if it
> is unacceptable
>
Decision was totally right. One should NOT change behavior of kernel
in the middle of LTS lifecycle (e.g. like it was done to
CONFIG_NET_NS). Of cause it seems kinda strange that CONFIG_SCHEDSTATS
is set to "y" and we are talking about CONFIG_
overhead.
And yes, at least some numbers would be nice (esp. form Nicholas
Janssen (xnicholas) who says that there is no overhead on his
workload).