Re: RT patch acceptance

[Nick Piggin <nickpiggin@yahoo.com.au>]

Ingo Molnar wrote:
> * Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> 
> 
>>Oh OK, I didn't realise it is aiming for hard RT. Cool! but
>>that wasn't so much the main point I was trying to make...
>>
>>
>>>so it's well worth the effort, but there's no hurry and all the changes 
>>>are incremental anyway. I can understand Daniel's desire for more action 
>>>(he's got a product to worry about), but upstream isnt ready for this 
>>>yet.
>>>
>>
>>Basically the same questions I think will still be up for debate. Not 
>>that I want to start now, nor do I really have any feelings on the 
>>matter yet (other than I'm glad you're not in a hurry :)).
> 
> 
> i expect it to be pretty much like voluntary-preempt: there was much 
> flaming 9 months ago and by today 99% of the voluntary-preempt patches 
> are already in the upstream kernel and the remaining 1% (which just adds 
> the config option and touches one include file) i didnt submit yet.
> 

Oh? I thought the idea of the voluntary-preempt thing was to stick
cond_rescheds into might_sleep. At least that was the part I think
I objected to... but I don't think I was one of the participants in
that flamewar :)

> so i dont think there's much need to worry or even to decide anything 
> upfront: the merge is already happening. The two biggest preconditions 
> of PREEMPT_RT, the irq subsystem rewrite, and the spinlock-init API 
> cleanups are already upstream. The rest is just details or out-of-line 
> code. The discussions need to happen in small isolated steps, as the 
> component technologies are merged and discussed. The components are all 
> useful even without the final PREEMPT_RT step (which further proves the 
> usefulness of PREEMPT_RT - but you dont have to agree with that global 
> assertion).
> 

No definitely - if things can get merged bit by bit in small, agreeable
chunks then that is the best way of course.

> So i'm afraid nothing radical will happen anywhere. Maybe we can have 
> one final flamewar-party in the end when the .config options are about 
> to be added, just for nostalgia, ok? =B-)

Well from Daniel's message it seemed like things were not quite so far
along as you say.

Flamewar party? I'm afraid I don't have a thing to bring (... yet!)
I'm sure someone will invite themselves, for old time's sake :)