linux-kernel - Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based on semi-formal proof"

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Date:	Fri, 27 May 2011 21:03:31 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	paulmck@...ux.vnet.ibm.com
CC:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: Re: [tip:core/rcu] Revert "rcu: Decrease memory-barrier usage based
 on semi-formal proof"

On 05/27/2011 06:04 PM, Paul E. McKenney wrote:
> 
> And, after having repeatedly shot myself in the foot trying to make
> an all-singing all-dancing RCU grace-period latency measurement tool,
> I fell back to simply measuring the RCU grace-period latency during
> the time that memory_dev_init() is running.  This assumes that the
> grace periods are started using synchronize_rcu() -- if they are instead
> being started using call_rcu(), I can adapt to that as well.
> 
[   31.635137] cpu_dev_init done
[   31.635320] Starting RCU latency diagnostics
[   71.605662] Ending RCU latency diagnostics
[   71.605924] memory_dev_init done


Thanks

Yinghai
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