linux-kernel - Re: [PATCH v3 07/15] KVM: MMU: introduce nulls desc

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Message-ID: <20131125112949.GJ3694@twins.programming.kicks-ass.net>
Date:	Mon, 25 Nov 2013 12:29:49 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	Marcelo Tosatti <mtosatti@...hat.com>, gleb@...hat.com,
	avi.kivity@...il.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: [PATCH v3 07/15] KVM: MMU: introduce nulls desc

On Mon, Nov 25, 2013 at 12:05:00PM +0100, Peter Zijlstra wrote:
> On Mon, Nov 25, 2013 at 06:59:24PM +0800, Xiao Guangrong wrote:
> > I guess Marcelo was talking about rculist_nulls.h
> > (Documentation/RCU/rculist_nulls.txt).
> 
> Oh, let me have a look, I don't think I've really looked at that yet.

Egads, that's far too clever ;-)

Yes, if that's what Marcello was referencing to he's right, it doesn't
have a proper termination condition in the face of unlimited
modification.

And it can indeed use SLAB_DESTROY_BY_RCU as you alluded to -- although
the documentation is a tad scarce explaining why this is so.
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