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

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Message-ID: <48B541C3.1090901@novell.com>
Date:	Wed, 27 Aug 2008 08:00:03 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Nick Piggin <npiggin@...e.de>, mingo@...e.hu, srostedt@...hat.com,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	gregory.haskins@...il.com,
	Russell King <rmk+lkml@....linux.org.uk>, ralf@...ux-mips.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 3/6] sched: make double-lock-balance fair

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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