linux-kernel - Re: [RFC][PATCH 2/2] rcu classic: new algorithm for callbacks-processing(v2)

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Message-ID: <20080718140930.GT6875@elte.hu>
Date:	Fri, 18 Jul 2008 16:09:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Gautham Shenoy <ego@...ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 2/2] rcu classic: new algorithm for
	callbacks-processing(v2)


* Lai Jiangshan <laijs@...fujitsu.com> wrote:

> This is v2, it's a little deference from v1 that I
> had send to lkml.
> use ACCESS_ONCE
> use rcu_batch_after/rcu_batch_before for batch # comparison.
> 
> rcutorture test result:
> (hotplugs: do cpu-online/offline once per second)
> 
> No CONFIG_NO_HZ:           OK, 12hours
> No CONFIG_NO_HZ, hotplugs: OK, 12hours
> CONFIG_NO_HZ=y:            OK, 24hours
> CONFIG_NO_HZ=y, hotplugs:  Failed.
> (Failed also without my patch applied, exactly the same bug occurred,
> http://lkml.org/lkml/2008/7/3/24)

thanks, i've applied this to tip/core/rcu - but it would be nice have an 
ack/nak from Paul as well, before we can proceed further.

	Ingo
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