linux-kernel - Re: [PATCH, RFC] v7 scalable classic RCU implementation

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Date:	Wed, 22 Oct 2008 20:41:11 +0200
From:	Manfred Spraul <manfred@...orfullife.com>
To:	paulmck@...ux.vnet.ibm.com
CC:	linux-kernel@...r.kernel.org, cl@...ux-foundation.org,
	mingo@...e.hu, akpm@...ux-foundation.org, 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.de
Subject: Re: [PATCH, RFC] v7 scalable classic RCU implementation

Paul E. McKenney wrote:
> Only once per such CPU every grace period -- seems in the noise to me.
> But I should revisit, as I have changed things quite a bit since I
> made that decision many weeks ago.  ;-)
>
>   
Another small point:
Does your implementation support rcu_check_callbacks() with cpu != 
smp_processor_id()?
I don't think my locking would support it properly.
Thus:
- cpu != smp_processor_id() doesn't work.
- stack space for a useless parameter.
- the explicit cpu parameter prevents the rcu code from using get_cpu_var().

What about modifying the rcu_check_callbacks() prototype? I'd propose to 
remove the cpu parameter.

--
    Manfred
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