Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751976AbZGSGsH (ORCPT ); Sun, 19 Jul 2009 02:48:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751292AbZGSGsF (ORCPT ); Sun, 19 Jul 2009 02:48:05 -0400 Received: from qmta15.emeryville.ca.mail.comcast.net ([76.96.27.228]:53776 "EHLO QMTA15.emeryville.ca.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751278AbZGSGsF (ORCPT ); Sun, 19 Jul 2009 02:48:05 -0400 Subject: Re: [RFC][PATCH] Introduce CLOCK_REALTIME_COARSE From: Nicholas Miell To: Arjan van de Ven Cc: Chris Snook , john stultz , lkml , Thomas Gleixner , Ingo Molnar , Andi Kleen , nikolag@ca.ibm.com, Darren Hart In-Reply-To: <20090718231429.7ddea95f@infradead.org> References: <1247873945.8334.67.camel@localhost.localdomain> <13a12eea0907182000v654e38a5l265ae5bdadb1a175@mail.gmail.com> <20090718231429.7ddea95f@infradead.org> Content-Type: text/plain Date: Sat, 18 Jul 2009 23:48:01 -0700 Message-Id: <1247986081.9351.21.camel@entropy> Mime-Version: 1.0 X-Mailer: Evolution 2.26.3 (2.26.3-1.fc11) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 713 Lines: 17 On Sat, 2009-07-18 at 23:14 -0700, Arjan van de Ven wrote: > it's on x86.. likely/unlikely don't impact the CPU (since there are no > "ignore the branch predictor" hints), only the code placement..... But code placement does affect branch prediction (e.g. the Pentium 4 static predictor assumes backward branches are taken, recent AMD processors prefer you to arrange code such that conditional branches are not taken, etc.) -- Nicholas Miell -- 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/