netdev - Re: [PATCH 4/3] rcu: documents rculist

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Date:	Fri, 14 Nov 2008 16:16:38 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	David Miller <davem@...emloft.net>,
	Corey Minyard <minyard@....org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	benny+usenet@...rsen.dk,
	Linux Netdev List <netdev@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Evgeniy Polyakov <zbr@...emap.net>,
	Christian Bell <christian@...i.com>
Subject: Re: [PATCH 4/3] rcu: documents rculist_nulls

On Thu, 2008-11-13 at 17:02 +0100, Eric Dumazet wrote:
> 
Eric Dumazet a écrit :
> > Peter Zijlstra a écrit :
> >> So by not using some memory barriers (would be nice to have it
> >> illustrated which ones), we can race and end up on the wrong chain, in
> >> case that happens we detect this by using this per-chain terminator and
> >> try again.
> >>
> >> It would be really good to have it explained in the rculist_nulls.h
> >> comments what memory barriers are missing, what races they open, and how
> >> the this special terminator trick closes that race.
> > 
> > OK, maybe I should add a Documentation/RCU/rculist_nulls.txt file with
> > appropriate examples and documentation.
> > 
> > (Say the lookup/insert algorithms, with standard hlist and memory barriers,
> > and with hlist_nulls without those two memory barriers.
> > 
> 
> [PATCH 4/3] rcu: documents rculist_nulls
> 
> Adds Documentation/RCU/rculist_nulls.txt file to describe how 'nulls'
> end-of-list can help in some RCU algos.
> 
> 
> Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

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