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From: Joel Fernandes <joel@joelfernandes.org>
To: "Paul E. McKenney" <paulmck@linux.ibm.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [RFC] rcu: doc: update example about stale data
Date: Tue, 30 Oct 2018 17:58:33 -0700	[thread overview]
Message-ID: <20181031005833.GE224709@google.com> (raw)
In-Reply-To: <20181030235039.GX4170@linux.ibm.com>

On Tue, Oct 30, 2018 at 04:50:39PM -0700, Paul E. McKenney wrote:
> On Sun, Oct 28, 2018 at 06:16:31PM -0700, Joel Fernandes wrote:
> > On Sun, Oct 28, 2018 at 10:21:42AM -0700, Paul E. McKenney wrote:
> > > On Sat, Oct 27, 2018 at 07:16:53PM -0700, Joel Fernandes (Google) wrote:
> > > > The RCU example for 'rejecting stale data' on system-call auditting
> > > > stops iterating through the rules if a deleted one is found. It makes
> > > > more sense to continue looking at other rules once a deleted one is
> > > > rejected. Although the original example is fine, this makes it more
> > > > meaningful.
> > > > 
> > > > Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
> > > 
> > > Does the actual audit code that this was copied from now include the
> > > continue statement?  If so, please update the commit log to state that
> > > and then I will take the resulting patch.  (This example was inspired
> > > by a long-ago version of the actual audit code.)
> > 
> > The document talks of a situation that could be but is not really in the
> > implementation. It says "If the system-call audit module were to ever need to
> > reject stale data". So its not really something implemented. I was just
> > correcting the example you had there since it made more sense to me to
> > continue looking for other rules in the list once a rule was shown to be
> > stale. It just makes the example more correct.
> > 
> > But I'm Ok if you want to leave that alone ;-) Hence, the RFC tag to this
> > patch ;-)
> 
> Well, I do agree that there are situations where you need to keep
> going.  But in the common case where only one instance of a given key
> is allowed, and where the list is either (1) sorted and/or (2) added
> to at the beginning, if you find a deleted element with a given key,
> you are guaranteed that you won't find another with that key even if
> you continue scanning the list.  After all, if you did find a deleted
> element, the duplicate either is not on the list in the sorted case
> or is behind you in the add-at-front case.
> 
> And in the more complex cases where persistent searching is required,
> you usually have to restart the search instead of continuing it.  Besides,
> things like the Issaquah Challenge don't seem to belong in introductory
> documentation on RCU.  ;-)

Ok, agreed. Lets drop this :)

-Joel


      reply	other threads:[~2018-10-31  0:58 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-28  2:16 Joel Fernandes (Google)
2018-10-28  4:44 ` Joel Fernandes
2018-10-28 17:29   ` Paul E. McKenney
2018-10-28 17:21 ` Paul E. McKenney
2018-10-29  1:16   ` Joel Fernandes
2018-10-30 23:50     ` Paul E. McKenney
2018-10-31  0:58       ` Joel Fernandes [this message]

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