netdev - Re: [RFC 1/2] sctp: convert hash list to RCU

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Message-ID: <1266567229.2877.29.camel@edumazet-laptop>
Date:	Fri, 19 Feb 2010 09:13:49 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Vlad Yasevich <vladislav.yasevich@...com>,
	Sridhar Samudrala <sri@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, linux-sctp@...r.kernel.org
Subject: Re: [RFC 1/2] sctp: convert hash list to RCU

Le jeudi 18 février 2010 à 21:55 -0800, Stephen Hemminger a écrit :
> pièce jointe document texte brut (sctp-rcu.patch)
> This patch converts existing SCTP hash list to using RCU
> rather than reader/writer lock. Also, get rid of no longer used
> locking wrappers.
> 
> In future, the SCTP hash locking should be broken out from the
> hash structure because of the wasted space for the hash locks
> and associated holes. A single lock per hashlist is sufficient
> now that RCU is used.
> 
> Compile tested only. I can't think of an SCTP stress application.
> 
> P.s: Some janitor ought to go through and remove the locking
> macros here.
> 
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
> 

Stephen, I read full patch and cannot see how you respect the rcu grace
period at dismantle phase. I am not familiar with SCTP, maybe its
already done ? (before the patch)



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