linux-kernel - Re: [PATCH] v3 RCU: the bloatwatch edition

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Date:	Thu, 2 Apr 2009 15:44:44 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	niv@...ibm.com, dvhltc@...ibm.com, dhowells@...hat.com,
	lethal@...ux-sh.org, kernel@...tstofly.org, matthew@....cx
Subject: Re: [PATCH] v3 RCU: the bloatwatch edition

On Fri, 3 Apr 2009 00:36:05 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> Andrew, what do you think?

I'm really struggling to see how the 900-odd bytes saved justifies
creating (yet another) variant of core kernel machinery.

> A worry is yet another RCU variant - we already have 3.

That would make four?

I wonder if that was sane of us.

> A trick we could use would be to put it into Documentation/rcu/, 
> linked in via some clever Makefile magic and only usable if a 
> ultra-embedded developer does a build with something like 
> CONFIG_RCU_TINY=y. That way there's no real maintenance and testing 
> overhead.
> 
> It _does_ have documentation value beyond the ~900 bytes: it's the 
> simplest and smallest possible still-working UP RCU implementation 
> so it would be easy to teach RCU concepts via that, gradually.
> 

hm.
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