From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754438Ab3LJQIY (ORCPT ); Tue, 10 Dec 2013 11:08:24 -0500 Received: from merlin.infradead.org ([205.233.59.134]:53715 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752065Ab3LJQIV (ORCPT ); Tue, 10 Dec 2013 11:08:21 -0500 Date: Tue, 10 Dec 2013 17:08:01 +0100 From: Peter Zijlstra To: Davidlohr Bueso Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, dvhart@linux.intel.com, tglx@linutronix.de, paulmck@linux.vnet.ibm.com, efault@gmx.de, jeffm@suse.com, torvalds@linux-foundation.org, scott.norton@hp.com, tom.vaden@hp.com, aswin@hp.com, Waiman.Long@hp.com, jason.low2@hp.com Subject: Re: [PATCH v2 4/4] futex: Avoid taking hb lock if nothing to wakeup Message-ID: <20131210160801.GL12849@twins.programming.kicks-ass.net> References: <1386063927-6545-1-git-send-email-davidlohr@hp.com> <1386063927-6545-5-git-send-email-davidlohr@hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1386063927-6545-5-git-send-email-davidlohr@hp.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 03, 2013 at 01:45:27AM -0800, Davidlohr Bueso wrote: > With the new atomic counter we only enlarge the futex_hash_bucket struct > by 4 bytes on 32bit systems, and it is left the same size for 64bit > ones, at 24 bytes. patch 2 grew the structure to be an entire cacheline, this now seems a rather pointless comment ;-)