linux-kernel - Re: [PATCH, RFC] v6 scalable classic RCU implementation

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Message-ID: <20080925072915.GB20249@elte.hu>
Date:	Thu, 25 Sep 2008 09:29:15 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, cl@...ux-foundation.org,
	akpm@...ux-foundation.org, manfred@...orfullife.com,
	dipankar@...ibm.com, josht@...ux.vnet.ibm.com, schamp@....com,
	niv@...ibm.com, dvhltc@...ibm.com, ego@...ibm.com,
	laijs@...fujitsu.com, rostedt@...dmis.org, peterz@...radead.org,
	penberg@...helsinki.fi, andi@...stfloor.org, tglx@...utronix.com,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH, RFC] v6 scalable classic RCU implementation


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

> Attached is an updated patch to Classic RCU that applies a hierarchy, 
> greatly reducing the contention on the top-level lock for large 
> machines.  This passes 10-hour concurrent rcutorture and 
> online-offline testing on 128-CPU ppc64 without dynticks enabled, and 
> exposes some timekeeping bugs in presence of dynticks (exciting 
> working on a system where "sleep 1" hangs until interrupted...).

i'm wondering about those timekeeping bugs. Do you have an idea what's 
it about and does it affect mainline?

	Ingo
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