From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753692Ab0H0H74 (ORCPT ); Fri, 27 Aug 2010 03:59:56 -0400 Received: from bombadil.infradead.org ([18.85.46.34]:37470 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752517Ab0H0H7v convert rfc822-to-8bit (ORCPT ); Fri, 27 Aug 2010 03:59:51 -0400 Subject: Re: [PATCH] lglock: make lg_lock_global() actually lock globally From: Peter Zijlstra To: Nick Piggin Cc: Tejun Heo , Linus Torvalds , Jonathan Corbet , Rusty Russell , Al Viro , LKML In-Reply-To: <1282895856.1975.1711.camel@laptop> References: <20100825132815.108d8217@bike.lwn.net> <4C762BF9.5010305@kernel.org> <20100826094613.GA6411@amd> <4C7638B7.9060306@kernel.org> <1282817329.1975.486.camel@laptop> <20100826113858.GA6856@amd> <1282823139.1975.689.camel@laptop> <20100827055105.GA3857@amd> <1282895856.1975.1711.camel@laptop> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Date: Fri, 27 Aug 2010 09:59:45 +0200 Message-ID: <1282895985.1975.1717.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2010-08-27 at 09:57 +0200, Peter Zijlstra wrote: > > > There's a large three lettered company that's promoting cpu hotplug use > for power management, they hotplug at an astonishing rate. > > I've been saying hotplug isn't for that, and its a terrible slow path > and disrupts your whole machine etc.. they don't seem to care much. Oh, and the virt community seems to want (or is) doing the same silly thing.