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

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Message-ID: <20100219190753.GD6778@linux.vnet.ibm.com>
Date:	Fri, 19 Feb 2010 11:07:53 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Vlad Yasevich <vladislav.yasevich@...com>,
	Sridhar Samudrala <sri@...ibm.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-sctp@...r.kernel.org
Subject: Re: [RFC 1/2] sctp: convert hash list to RCU

On Fri, Feb 19, 2010 at 08:18:56AM -0800, Stephen Hemminger wrote:
> On Fri, 19 Feb 2010 07:58:25 -0800
> "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> 
> > On Thu, Feb 18, 2010 at 09:55:21PM -0800, Stephen Hemminger wrote:
> > > 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.
> > 
> > One question below about what looks to be mixing of RCU and RCU-bh
> > read-side critical sections while waiting only for RCU grace periods.
> > Unless I am missing something, this can result in memory corruption.
> 
> Thanks, I copied the original locking which was broken there as well.

I know that feeling!  :-)

							Thanx, Paul
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