Re: [ANNOUNCE] 3.8-rc6-nohz4

[Frederic Weisbecker]

2013/2/7 Steven Rostedt <rostedt@xxxxxxxxxxx>:
> On Thu, 2013-02-07 at 17:25 +0100, Frederic Weisbecker wrote:
>
>> At least for now we seem to agree on CONFIG_NO_HZ_IDLE and keep
>> CONFIG_NO_HZ for compatibility. Are you ok with that? If so I'll send
>> a patch.
>
> I believe that Ingo was suggesting to have CONFIG_NO_HZ give options to
> what type of config NO_HZ you want. Something like:
>
> config NO_HZ
>         bool "Enable tickless support"
>
> config NO_HZ_IDLE
>         bool "Stop tick when CPU is idle"
>         default y
>         depends on NO_HZ

Sounds good!

>
> config NO_HZ_TASK
>         bool "Stop tick on specified CPUs when single task is running"
>         default n
>         depends on NO_HZ

Ok I launched another debate about that single task thing. I wish we
don't make it a fundamental component but rather an implementation
detail that can be dynamically dealt with in the future. Anyway let's
talk about that on my previous answer.

>
> That is, if you select NO_HZ, by default NO_HZ_IDLE is also selected.
> But in the kernel the NO_HZ_IDLE is used.

Yeah, nice idea!

>
> -- Steve
>
>
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