linux-kernel - Re: [PATCH tip/core/rcu 17/86] rcu: fix boost-tracing bug and update tracing documentation

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Message-ID: <20110502221919.GJ2294@linux.vnet.ibm.com>
Date:	Mon, 2 May 2011 15:19:19 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org, "Paul E. McKenney" <paul.mckenney@...aro.org>
Subject: Re: [PATCH tip/core/rcu 17/86] rcu: fix boost-tracing bug and
 update tracing documentation

On Mon, May 02, 2011 at 10:44:42AM -0700, Josh Triplett wrote:
> On Mon, May 02, 2011 at 01:33:01AM -0700, Paul E. McKenney wrote:
> > On Sun, May 01, 2011 at 08:43:10AM -0700, Josh Triplett wrote:
> > > Also, does rcu/rcutorture appear with rcutorture not loaded?  Hopefully
> > > not, since rcutorture shouldn't take up any additional resources when
> > > not loaded.
> > 
> > Not much choice, unfortunately.  If I put the info into rcutorture, then
> > I lose it when rcutorture is unloaded.  This is problematic in automated
> > tests that repeatedly load and unload rcutorture.
> > 
> > But the amount of data is small, and I set things up so that TINY_RCU
> > can omit this.  TREE_RCU is big enough that it doesn't really matter.
> 
> You could omit it entirely if CONFIG_RCU_TORTURE_TEST=n (rather than
> =m).

I could, but it doesn't seem worth it.  Of course, it might be just
the fact that I am writing this from the Toronto airport...

						Thanx, Paul
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