From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752052AbaHLX6F (ORCPT ); Tue, 12 Aug 2014 19:58:05 -0400 Received: from e36.co.us.ibm.com ([32.97.110.154]:41225 "EHLO e36.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751166AbaHLX6D (ORCPT ); Tue, 12 Aug 2014 19:58:03 -0400 Date: Tue, 12 Aug 2014 16:57:56 -0700 From: "Paul E. McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com Subject: Re: [PATCH tip/core/rcu 0/16] RCU-tasks implementation Message-ID: <20140812235756.GA22698@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20140811224840.GA25594@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140811224840.GA25594@linux.vnet.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14081223-3532-0000-0000-000003CCCFD7 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 11, 2014 at 03:48:40PM -0700, Paul E. McKenney wrote: > Hello! > > This series provides v5 of a prototype of an RCU-tasks implementation, > which has been requested to assist with tramopoline removal. This flavor > of RCU is task-based rather than CPU-based, and has voluntary context > switch, usermode execution, and the idle loops as its only quiescent > states. This selection of quiescent states ensures that at the end > of a grace period, there will no longer be any tasks depending on a > trampoline that was removed before the beginning of that grace period. > This works because such trampolines do not contain function calls, > do not contain voluntary context switches, do not switch to usermode, > and do not switch to idle. [ . . . ] > o There are probably still bugs. And there probably are, but this version passes 10-hour rcutorture tests in a few configurations, so getting reasonably robust. Thanx, Paul