Re: [PATCH v2 3/6] sched: make double-lock-balance fair

[Gregory Haskins]

Peter Zijlstra wrote:
> On Wed, 2008-08-27 at 12:56 +0200, Nick Piggin wrote:
>
>   
>> BTW. I wonder about other architectures that are of interest to -rt? Like
>> mips or arm perhaps... Any plans to implement ticket locks on those, or
>> do they not tend to be used in SMP configurations on -rt yte?
>>     
>
> I think both are starting to show more and more SMP machines, so yes,
> eventually we'll want ticket locks for them too.
>
> That said, I'm not aware of anyone working on it - I suppose we could
> poke the regular arch maintainers.. Ralf, Russell ?
>
>   
As an aside:  I have an implementation of C-based ticket lock
replacements for raw_spinlock_t that I could post.  I never posted them
because I mostly care about x86 and Nick's solution is superior there
since its hand-tuned asm.  But mine could be used in places that have
not yet written arch support but need FIFO.  I basically have it as a
config option to enable "generic fifo spinlocks" or something like that.

-Greg

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