linux-kernel - Re: [RFC][PATCH RT] rwsem_rt: Another (more sane) approach to mulit reader rt locks

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Message-ID: <1337268779.4281.38.camel@twins>
Date:	Thu, 17 May 2012 17:32:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <williams@...hat.com>
Subject: Re: [RFC][PATCH RT] rwsem_rt: Another (more sane) approach to mulit
 reader rt locks

On Thu, 2012-05-17 at 08:18 -0700, Paul E. McKenney wrote:
> Some researchers at MIT RCU-ified this lock:
> 
> http://people.csail.mit.edu/nickolai/papers/clements-bonsai.pdf 

Ah, as have I [1].. and they seem to have gotten about as far as I have,
which means almost there but not quite [2] :-)

The most interesting case is file maps and they simply ignored those.
While I appreciate that from an academic pov, -- they can still write a
paper on the other interesting bits -- I don't really like it from a
practical point.

[1] https://lkml.org/lkml/2010/1/4/257
[2] https://lkml.org/lkml/2010/1/4/532


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