Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934578AbaFSUcA (ORCPT ); Thu, 19 Jun 2014 16:32:00 -0400 Received: from qmta13.emeryville.ca.mail.comcast.net ([76.96.27.243]:43036 "EHLO qmta13.emeryville.ca.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932071AbaFSUb7 (ORCPT ); Thu, 19 Jun 2014 16:31:59 -0400 Date: Thu, 19 Jun 2014 15:31:56 -0500 (CDT) From: Christoph Lameter To: "Paul E. McKenney" cc: Andi Kleen , Dave Hansen , LKML , Josh Triplett , "Chen, Tim C" Subject: Re: [bisected] pre-3.16 regression on open() scalability In-Reply-To: <20140619180916.GE4904@linux.vnet.ibm.com> Message-ID: References: <20140613224519.GV4581@linux.vnet.ibm.com> <53A0CAE5.9000702@intel.com> <20140618001836.GV4669@linux.vnet.ibm.com> <53A132D4.60408@intel.com> <20140618125831.GB4669@linux.vnet.ibm.com> <53A1CE19.7040103@intel.com> <20140618203052.GT4669@linux.vnet.ibm.com> <20140618235131.GA25946@linux.vnet.ibm.com> <20140619014200.GO8178@tassilo.jf.intel.com> <20140619180916.GE4904@linux.vnet.ibm.com> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 19 Jun 2014, Paul E. McKenney wrote: > That is a separate issue, but unnecessary calls to cond_resched() > should of course be removed -- no argument there. It looks like we are fighting higher latencies by adding calls in most of the critical sections which will in turn increase the latencies that we are trying to reduce. -- 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/