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

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Message-ID: <20090114104055.GD2913@elte.hu>
Date:	Wed, 14 Jan 2009 11:40:55 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	niv@...ibm.com, dvhltc@...ibm.com
Subject: Re: [PATCH fyi] RCU: the bloatwatch edition


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> Just FYI, not for inclusion.
> 
> This patch is a version of RCU designed for !CONFIG_SMP provided as a 
> proof of concept of a small-footprint RCU implementation.  In 
> particular, the implementation of synchronize_rcu() is extremely 
> lightweight and high performance.  It passes moderate rcutorture testing 
> in each of the four relevant configurations (combinations of NO_HZ and 
> PREEMPT) on x86.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

maybe it could be included - dependent on PREEMPT, just like we have SLOB?

it would also be rather educative IMO: if someone wants to understand the 
core concepts of RCU, start with kernel/rcutiny.c. We are getting 
complaints from academic institutions that the Linux kernel is getting too 
complex to teach in courses - and that's a pity.

	Ingo
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