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Message-ID: <20140218002248.GU4250@linux.vnet.ibm.com>
Date: Mon, 17 Feb 2014 16:22:48 -0800
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Josh Triplett <josh@...htriplett.org>
Cc: linux-kernel@...r.kernel.org, mingo@...nel.org,
laijs@...fujitsu.com, dipankar@...ibm.com,
akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
darren@...art.com, fweisbec@...il.com, oleg@...hat.com,
sbw@....edu, linux@...izon.com
Subject: Re: [PATCH tip/core/rcu 15/55] rcutorture: Abstract
rcu_torture_random()
On Mon, Feb 17, 2014 at 04:11:37PM -0800, Josh Triplett wrote:
> On Mon, Feb 17, 2014 at 02:12:19PM -0800, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> >
> > Because rcu_torture_random() will be used by the locking equivalent to
> > rcutorture, pull it out into its own module.
> >
> > Suggested-by: Rusty Russell <rusty@...tcorp.com.au>
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
>
> I'd suggest making CONFIG_TORTURE_TEST a completely invisible option,
> with no description; it should only be brought in via "select".
>
> Also, it doesn't need most of the headers it currently includes.
>
> Have you considered moving it into the existing random generation
> infrastructure, as something like "fast_insecure_nonblocking_random"?
> That seems more generally useful.
George Spelvin was also advising me on random-number generation in
rcutorture, so I added him on CC. In any case, I would not be adverse
to using some other random-number service, as long as it is fast enough.
(George suggested some optimizations that I have not yet tried out.)
Thanx, Paul
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