From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Paul E. McKenney" Subject: Re: [PATCH -tip 0/3] expedited "big hammer" RCU grace periods Date: Thu, 25 Jun 2009 08:27:36 -0700 Message-ID: <20090625152736.GC6761@linux.vnet.ibm.com> References: <20090624164535.GA13334@linux.vnet.ibm.com> <20090624180303.GE7576@elte.hu> <20090624184423.GK6779@linux.vnet.ibm.com> <20090625095953.GC29980@elte.hu> Reply-To: paulmck@linux.vnet.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, akpm@linux-foundation.org, torvalds@linux-foundation.org, davem@davemloft.net, dada1@cosmosbay.com, zbr@ioremap.net, jeff.chua.linux@gmail.com, paulus@samba.org, laijs@cn.fujitsu.com, jengelh@medozas.de, r000n@r000n.net, benh@kernel.crashing.org, mathieu.desnoyers@polymtl.ca To: Ingo Molnar Return-path: Received: from e6.ny.us.ibm.com ([32.97.182.146]:55429 "EHLO e6.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758115AbZFYP1l (ORCPT ); Thu, 25 Jun 2009 11:27:41 -0400 Content-Disposition: inline In-Reply-To: <20090625095953.GC29980@elte.hu> Sender: netfilter-devel-owner@vger.kernel.org List-ID: On Thu, Jun 25, 2009 at 11:59:53AM +0200, Ingo Molnar wrote: > > * Paul E. McKenney wrote: > > > On Wed, Jun 24, 2009 at 08:03:03PM +0200, Ingo Molnar wrote: > > > > > > * Paul E. McKenney wrote: > > > > > > > include/linux/rcuclassic.h | 15 ++- > > > > > > heh, we dont have this file anymore ... as of today, right? :) > > > > Ah, I was assuming that expedited RCU would happen before removal > > of Classic RCU. > > Our general preference is to zap code. Actually worked out nicely in this case -- the fact that Classic RCU is no longer in -tip meant that I could dump 25% of my test cases for expedited RCU. ;-) I will be posting the updated patch shortly. > /me stares at: > > $ git diff --stat -M v2.6.30..v2.6.31-rc1 | tail -1 > 7743 files changed, 782278 insertions(+), 403162 deletions(-) > > /me corrects himself: > > Okay, so the zapping of code is the divine guiding principle we've > been following for 15 years. Ending up with a kernel that is 11 > million lines of code is a small imperfection of mankind and is to > be fixed. ;-) ;-) ;-) I guess that if 11 million lines of code is a small imperfection of mankind, we can only be thankful that we are not tasked with dealing with the large imperfections. ;-) Thanx, Paul