linux-kernel - Re: [PATCH tip/core/rcu 1/2] rcu: Parallelize and economize NOCB kthread wakeups

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Message-ID: <20140812160840.GD4752@linux.vnet.ibm.com>
Date:	Tue, 12 Aug 2014 09:08:40 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	linux-kernel@...r.kernel.org, riel@...hat.com, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, 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
Subject: Re: [PATCH tip/core/rcu 1/2] rcu: Parallelize and economize NOCB
 kthread wakeups

On Tue, Aug 12, 2014 at 10:57:26AM +0530, Amit Shah wrote:
> On (Mon) 11 Aug 2014 [13:34:21], Paul E. McKenney wrote:
> > On Tue, Aug 12, 2014 at 01:48:45AM +0530, Amit Shah wrote:

[ . . . ]

> > > > In addition "sendkey alt-sysrq-t" at the "(qemu)" prompt dumps all tasks'
> > > > stacks, which would also likely be useful information.
> > > 
> > > Nah, this doesn't work -- the guest's totally locked up.  I need a way
> > > to continuously dump buffers till the lockup happens, I suppose.
> > 
> > That is a bit surprising.  Is it possible that the system is OOMing
> > quickly due to grace periods not proceeding?  If so, maybe giving the
> > VM more memory would help.
> 
> I bumped it up to 1G and then 2G, same result.

OK.  I am then back at making the system dump core.

							Thanx, Paul

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