[PATCH 08/41] nohz: Try not to give the timekeeping duty to an adaptive tickless cpu

[Frederic Weisbecker]

2012/5/7 Christoph Lameter <cl at linux.com>:
> On Tue, 1 May 2012, Frederic Weisbecker wrote:
>
>> Try to give the timekeeing duty to a CPU that doesn't belong
>> to any nohz cpuset when possible, so that we increase the chance
>> for these nohz cpusets to run their CPUs out of periodic tick
>> mode.
>>
>> [TODO: We need to find a way to ensure there is always one non-nohz
>> running CPU maintaining the timekeeping duty if every non-idle CPUs are
>> adaptive tickless]
>
> I sure wish this would also be pinnable to a specific cpu.

Yeah, well we need to be more flexible and allow for finegrained sets of CPUs,
I quoted some reasons in one of our previous discussions:
https://lkml.org/lkml/2012/3/29/559