linux-kernel - Re: [ANNOUNCE] 3.2.9-rt17

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Message-ID: <1331245665.25686.521.camel@gandalf.stny.rr.com>
Date:	Thu, 08 Mar 2012 17:27:45 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [ANNOUNCE] 3.2.9-rt17

On Thu, 2012-03-08 at 23:20 +0100, Peter Zijlstra wrote:

> and with rt-mutex having the equal priority lock stealing this reverts
> to a plain test-and-set lock. There's only a tiny window in which A can
> actually get the lock and that is hampered by B's cpu owning the
> cacheline in exclusive mode.
> 
> I simply cannot see guaranteed progress here.

This can be easily fixed by not having the lateral steal when a lock has
a priority.

-- Steve




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