Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753528Ab3IJEHQ (ORCPT ); Tue, 10 Sep 2013 00:07:16 -0400 Received: from cantor2.suse.de ([195.135.220.15]:46958 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752426Ab3IJEHO (ORCPT ); Tue, 10 Sep 2013 00:07:14 -0400 Message-ID: <1378786024.5486.78.camel@marge.simpson.net> Subject: Re: [PATCH] rcu: Is it safe to enter an RCU read-side critical section? From: Mike Galbraith To: Christoph Lameter Cc: Peter Zijlstra , "Paul E. McKenney" , Frederic Weisbecker , Eric Dumazet , linux-kernel@vger.kernel.org, mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, darren@dvhart.com, sbw@mit.edu Date: Tue, 10 Sep 2013 06:07:04 +0200 In-Reply-To: <000001410333127c-486c74ec-3209-4c5e-a92f-0c11e00fa141-000000@email.amazonses.com> References: <20130905195234.GA20555@linux.vnet.ibm.com> <20130906105934.GF20519@somewhere> <20130906151851.GQ3966@linux.vnet.ibm.com> <1378488088.31445.39.camel@edumazet-glaptop> <20130906174117.GU3966@linux.vnet.ibm.com> <20130906185927.GE2706@somewhere> <20130909105347.GK31370@twins.programming.kicks-ass.net> <20130909132343.GN3966@linux.vnet.ibm.com> <20130909133604.GC31370@twins.programming.kicks-ass.net> <000001410333127c-486c74ec-3209-4c5e-a92f-0c11e00fa141-000000@email.amazonses.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 764 Lines: 19 On Mon, 2013-09-09 at 14:49 +0000, Christoph Lameter wrote: > Its just that PREEMPT kernels are > not in use and AFAICT the full preempt stuff requires significant developer > support and complicates the code without much benefit. The openSUSE desktop kernel is PREEMPT, and presumably has users. I use VOLUNTARY for my desktop, having zero tight latency constraints, and not being into inflicting needless pain on poor defenseless boxen, but lots of folks do use PREEMPT, and some of them may even need it. -Mike -- 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/