linux-kernel - Re: Spinlocks: Factor our GENERIC_LOCKBREAK in order to avoid spin with irqs disable

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Message-ID: <Pine.LNX.4.64.0806261001310.7369@schroedinger.engr.sgi.com>
Date:	Thu, 26 Jun 2008 10:02:05 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Petr Tesarik <ptesarik@...e.cz>
cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: Spinlocks: Factor our GENERIC_LOCKBREAK in order to avoid spin
 with irqs disable

On Thu, 26 Jun 2008, Petr Tesarik wrote:

> We should probably re-think the whole locking scheme, because spinlocks
> were designed to be held for a short period of time. This was a fair
> assumption when they were introduced, but obviously it is now false in
> many cases (such as virtualization).

And NUMA.

> Ticket-based spinlocks have actually already changed the original
> design, so why not implement a generic "lock scheduler" on top of
> spinlock_t and rwlock_t?

How about making the semaphore / mutex code as fast as spinlocks and just 
use that?

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