linux-kernel - Re: [PATCH 2/3] locking: ww_mutex: Allow to use rt

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Message-ID: <1425300626.5863.22.camel@gmail.com>
Date:	Mon, 02 Mar 2015 13:50:26 +0100
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Maarten Lankhorst <maarten.lankhorst@...onical.com>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 2/3] locking: ww_mutex: Allow to use rt_mutex instead of
 mutex for the baselock

On Mon, 2015-03-02 at 09:46 +0100, Maarten Lankhorst wrote:
> Hey,
> 
> Op 02-03-15 om 04:20 schreef Mike Galbraith:
> > On Fri, 2015-02-27 at 17:57 +0100, Sebastian Andrzej Siewior wrote:
> >> This patch makes it possible to replace the base mutex by a rt_mutex. In
> >> general one would not do this.
> > I would argue that the thing should be born as a full fledged primitive,
> > not a config option, as an rt_ww_mutex is the ww extension of rt_mutex.
> > We have to do the global substitution in -rt, but why should it not
> > exist in its own right in mainline? 

> Well I haven't seen any users that specifically need a rt_ww_mutex,
> but flipping the switch on ww_mutex could be useful for testing. :)

Imagine a manufacturer of MRI machines.. they have both hard realtime
constraints and hefty rendering requirements.  I suspect they could find
a use for both.

	-Mike

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