linux-kernel - Re: [PATCH RFC tip/core/rcu 1/2] rcu: Rationalize kthread spawning

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Message-ID: <20140717053334.GL8690@linux.vnet.ibm.com>
Date:	Wed, 16 Jul 2014 22:33:34 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com,
	oleg@...hat.com, sbw@....edu, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH RFC tip/core/rcu 1/2] rcu: Rationalize kthread spawning

On Wed, Jul 16, 2014 at 10:57:39PM -0400, Sasha Levin wrote:
> On 07/14/2014 06:06 AM, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > 
> > Currently, RCU spawns kthreads from several different early_initcall()
> > functions.  Although this has served RCU well for quite some time,
> > as more kthreads are added a more deterministic approach is required.
> > This commit therefore causes all of RCU's early-boot kthreads to be
> > spawned from a single early_initcall() function.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> Hey Paul,
> 
> I've updated to today's -next and my VM started hanging on boot. Bisect
> pointed out this patch.
> 
> I don't have any further info right now, but can provide whatever you'll
> find useful.

Could you please add initcall_debug to qemu's -append list?  If sysrq-T
works that early, its output would be helpful as well.

Your .config would also be helpful.

							Thanx, Paul

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