linux-kernel - Re: linux-next: Tree for Feb 4

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Message-ID: <20150205184537.GJ5370@linux.vnet.ibm.com>
Date:	Thu, 5 Feb 2015 10:45:37 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dave Hansen <dave@...1.net>
Cc:	Steven Rostedt <rostedt@...dmis.org>, sedat.dilek@...il.com,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-next <linux-next@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Kristen Carlson Accardi <kristen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>
Subject: Re: linux-next: Tree for Feb 4

On Thu, Feb 05, 2015 at 10:35:33AM -0800, Dave Hansen wrote:
> On 02/05/2015 10:34 AM, Paul E. McKenney wrote:
> >> >                               Did I actually need to be
> >> > onlining/offlining CPUs to hit the splat that Sedat was reporting?
> > Yep, you do need to offline at least one CPU to hit that splat.
> 
> Heh, do we need a debugging mode that will randomly offline/online CPUs? :)

For that, kernel/rcu/rcutorture.c and kernel/locking/locktorture.c
are your friends.  ;-)

The problem is that I only run RCU-relevant combinations of Kconfigs,
which means that I missed the ones that Sedat used to find this problem.
So I guess it is a good thing that others run -next testing.

							Thanx, Paul

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