Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967304Ab2EQPss (ORCPT ); Thu, 17 May 2012 11:48:48 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:46628 "EHLO e39.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754367Ab2EQPso (ORCPT ); Thu, 17 May 2012 11:48:44 -0400 Date: Thu, 17 May 2012 08:47:55 -0700 From: "Paul E. McKenney" To: Peter Zijlstra Cc: Steven Rostedt , LKML , RT , Thomas Gleixner , Clark Williams Subject: Re: [RFC][PATCH RT] rwsem_rt: Another (more sane) approach to mulit reader rt locks Message-ID: <20120517154755.GG2567@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <1337090625.14207.304.camel@gandalf.stny.rr.com> <20120517151838.GA8692@linux.vnet.ibm.com> <1337268779.4281.38.camel@twins> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1337268779.4281.38.camel@twins> User-Agent: Mutt/1.5.21 (2010-09-15) X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12051715-4242-0000-0000-000001B33F13 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1181 Lines: 30 On Thu, May 17, 2012 at 05:32:59PM +0200, Peter Zijlstra wrote: > 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] :-) I had forgotten about that -- that was the first call for call_srcu(), if I remember correctly. > 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 Hmmm... Do the recent dcache changes cover some of the things that Linus called out? Probably not, but some at least. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/