linux-kernel - Re: [PATCH -tip 0/3] expedited "big hammer" RCU grace periods

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Message-ID: <20090625152736.GC6761@linux.vnet.ibm.com>
Date:	Thu, 25 Jun 2009 08:27:36 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, davem@...emloft.net,
	dada1@...mosbay.com, zbr@...emap.net, jeff.chua.linux@...il.com,
	paulus@...ba.org, laijs@...fujitsu.com, jengelh@...ozas.de,
	r000n@...0n.net, benh@...nel.crashing.org,
	mathieu.desnoyers@...ymtl.ca
Subject: Re: [PATCH -tip 0/3] expedited "big hammer" RCU grace periods

On Thu, Jun 25, 2009 at 11:59:53AM +0200, Ingo Molnar wrote:
> 
> * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > On Wed, Jun 24, 2009 at 08:03:03PM +0200, Ingo Molnar wrote:
> > > 
> > > * Paul E. McKenney <paulmck@...ux.vnet.ibm.com> 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
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