Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754701AbbGAP6a (ORCPT ); Wed, 1 Jul 2015 11:58:30 -0400 Received: from e39.co.us.ibm.com ([32.97.110.160]:52247 "EHLO e39.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754213AbbGAP6W (ORCPT ); Wed, 1 Jul 2015 11:58:22 -0400 X-Helo: d03dlp02.boulder.ibm.com X-MailFrom: paulmck@linux.vnet.ibm.com X-RcptTo: linux-kernel@vger.kernel.org Date: Wed, 1 Jul 2015 08:58:15 -0700 From: "Paul E. McKenney" To: Eric Dumazet Cc: Peter Zijlstra , Josh Triplett , LKML , Ingo Molnar , laijs@cn.fujitsu.com, dipankar@in.ibm.com, Andrew Morton , mathieu.desnoyers@efficios.com, Thomas Gleixner , rostedt@goodmis.org, dhowells@redhat.com, dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com Subject: Re: [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones Message-ID: <20150701155815.GH3717@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20150630214805.GA7795@linux.vnet.ibm.com> <20150630220014.GA10916@cloud> <20150630221224.GQ3717@linux.vnet.ibm.com> <20150630234633.GA11450@cloud> <20150701001558.GU3717@linux.vnet.ibm.com> <20150701004214.GA30853@x> <20150701033701.GV3717@linux.vnet.ibm.com> <20150701101221.GS19282@twins.programming.kicks-ass.net> <20150701140121.GC3717@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15070115-0033-0000-0000-00000506981A Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 854 Lines: 24 On Wed, Jul 01, 2015 at 04:08:27PM +0200, Eric Dumazet wrote: > > OK, I'll bite. Exactly what seems especially vile about it? > > Presumably we would need to convert everything to async model > (call_rcu() and friends), > but that is a long way to go... > > For example, synchronize_srcu_expedited() in kvm_set_irq_routing() > really looks overkill. But synchronize_srcu_expedited() is SRCU, and does not disturb the rest of the system. Don't get me wrong, if converting it to call_srcu() helps, why not? But synchronize_srcu_expedited() isn't messing up HPC or real-time workloads. 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/