Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753452AbaKIAvx (ORCPT ); Sat, 8 Nov 2014 19:51:53 -0500 Received: from e39.co.us.ibm.com ([32.97.110.160]:47274 "EHLO e39.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753259AbaKIAvv (ORCPT ); Sat, 8 Nov 2014 19:51:51 -0500 Date: Sat, 8 Nov 2014 16:51:24 -0800 From: "Paul E. McKenney" To: Alexander Monakov Cc: Konstantin Khlebnikov , linux-acpi@vger.kernel.org, "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Len Brown , Tom Boshoven , x86@kernel.org, Josh Triplett Subject: Re: [PATCH] ACPI/osl: speedup grace period in acpi_os_map_cleanup Message-ID: <20141109005124.GG4901@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20141108094717.9388.34638.stgit@zurg> <20141108221347.GF4901@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: 14110900-0033-0000-0000-0000029DB82D Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Nov 09, 2014 at 03:24:34AM +0400, Alexander Monakov wrote: > On Sun, Nov 9, 2014 at 1:13 AM, Paul E. McKenney > wrote: > > > > Did anyone try replacing the synchronize_rcu() with > > synchronize_rcu_expedited()? That should provide substantial speedups > > over synchronize_rcu(). > > I've just briefly tested it on my laptop, and it also helps to avoid the issue. OK, good. In the past, synchronize_rcu_expedited() has been a bit unfriendly to battery-powered platforms and to real-time and HPC workloads, but recent changes for the most part fix this. 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/