linux-kernel - Re: [PATCH RFC 3/9] RCU: Preemptible RCU

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Message-ID: <Pine.LNX.4.64.0710011249390.25942@alien.or.mcafeemobile.com>
Date:	Mon, 1 Oct 2007 15:09:16 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Oleg Nesterov <oleg@...sign.ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-rt-users@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>, dipankar@...ibm.com,
	josht@...ux.vnet.ibm.com, tytso@...ibm.com, dvhltc@...ibm.com,
	tglx@...utronix.de, a.p.zijlstra@...llo.nl, bunk@...nel.org,
	ego@...ibm.com, srostedt@...hat.com
Subject: Re: [PATCH RFC 3/9] RCU: Preemptible RCU

On Mon, 1 Oct 2007, Paul E. McKenney wrote:

> That would indeed be one approach that CPU designers could take to
> avoid being careless or sadistic.  ;-)

That'd be the easier (unique maybe) approach too for them, from an silicon 
complexity POV. Distinguishing between different CPUs stores once inside a 
shared store buffer, would require tagging them in some way. That'd defeat 
most of the pros of having a shared store buffer ;)



- Davide


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