Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030942AbbDWUmn (ORCPT ); Thu, 23 Apr 2015 16:42:43 -0400 Received: from g1t5424.austin.hp.com ([15.216.225.54]:42010 "EHLO g1t5424.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030473AbbDWUmk (ORCPT ); Thu, 23 Apr 2015 16:42:40 -0400 Message-ID: <1429821758.20330.6.camel@j-VirtualBox> Subject: Re: [PATCH v2] locking/rwsem: reduce spinlock contention in wakeup after up_read/up_write From: Jason Low To: Waiman Long Cc: Peter Zijlstra , Ingo Molnar , linux-kernel@vger.kernel.org, Scott J Norton , Douglas Hatch , jason.low2@hp.com Date: Thu, 23 Apr 2015 13:42:38 -0700 In-Reply-To: <1429813449-19641-1-git-send-email-Waiman.Long@hp.com> References: <1429813449-19641-1-git-send-email-Waiman.Long@hp.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3-0ubuntu6 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: 24 On Thu, 2015-04-23 at 14:24 -0400, Waiman Long wrote: > The table below shows the % improvement in throughput (1100-2000 users) > in the various AIM7's workloads: > > Workload % increase in throughput Missing table here? :) > --- > include/linux/osq_lock.h | 5 +++ > kernel/locking/rwsem-xadd.c | 72 ++++++++++++++++++++++++++++++++++++++++++- > 2 files changed, 76 insertions(+), 1 deletions(-) > > v1->v2: > - Add a memory barrier before calling spin_trylock for proper memory > ordering. -- 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/