linux-kernel - Re: [PATCH] v4 RCU: the bloatwatch edition

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Message-Id: <20090506121908.1fcd3afc.akpm@linux-foundation.org>
Date:	Wed, 6 May 2009 12:19:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	mingo@...e.hu, dhowells@...hat.com, linux-kernel@...r.kernel.org,
	niv@...ibm.com, dvhltc@...ibm.com, lethal@...ux-sh.org,
	kernel@...tstofly.org, matthew@....cx
Subject: Re: [PATCH] v4 RCU: the bloatwatch edition

On Wed, 6 May 2009 12:02:16 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> > > i'm wondering what Andrew thinks - he had objections, right?
> > > 
> > 
> > More like "concerns".  It's unobvious to me that the modest .text
> > savings justify the costs of an additional RCU implementation.  Where
> > those costs include
> > 
> > - additional maintenance work and
> > 
> > - the reduced code reliability which comes from fragmenting the
> >   tester base.  This will mostly affect users of the less popular RCU
> >   implementations.
> > 
> > But hey, maybe I'm wrong.  And maybe I'm right, but we'll merge it anyway ;)
> 
> ;-)
> 
> How about if acceptance of Tiny RCU happens at the same time as Classic
> RCU is dropped?  That would be a large net decrease in code size and
> complexity.

It's a bit artificial to link the two actions.  Removing something:
good.  Adding something: bad.  good+bad == less good ;)
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