linux-kernel - Re: [RFC PATCH] Fair low-latency rwlock v5

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Message-Id: <1219692042.8515.119.camel@twins>
Date:	Mon, 25 Aug 2008 21:20:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, Joe Perches <joe@...ches.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] Fair low-latency rwlock v5

On Sun, 2008-08-17 at 15:10 -0400, Mathieu Desnoyers wrote:

> Fair low-latency rwlock v5
> 
> Fair low-latency rwlock provides fairness for writers against reader threads,
> but lets softirq and irq readers in even when there are subscribed writers
> waiting for the lock. Writers could starve reader threads.

New lock types should come with lockdep support.

Also, if you're serious about -rt, you'll need to consider full PI.

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