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

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Message-ID: <20080829124916.GE16101@linux-mips.org>
Date:	Fri, 29 Aug 2008 13:49:16 +0100
From:	Ralf Baechle <ralf@...ux-mips.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Nick Piggin <npiggin@...e.de>,
	Gregory Haskins <ghaskins@...ell.com>, 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>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 3/6] sched: make double-lock-balance fair

On Wed, Aug 27, 2008 at 01:07:04PM +0200, Peter Zijlstra 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 ?

I looked into this a bit and we definately need it.  One large MIPS user
already had converted his kernel to ticket locks due to an excessive
number of cacheline bounces having been observed.

  Ralf
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