linux-kernel - Re: [PATCH 01/10] alpha: Add missing RCU idle APIs on idle loop

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Message-ID: <20120823105816.GB18835@somewhere.redhat.com>
Date:	Thu, 23 Aug 2012 12:58:19 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Michael Cree <mcree@...on.net.nz>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	alpha <linux-alpha@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"3.2.x.." <stable@...nel.org>
Subject: Re: [PATCH 01/10] alpha: Add missing RCU idle APIs on idle loop

On Thu, Aug 23, 2012 at 09:32:18PM +1200, Michael Cree wrote:
> On 23/08/12 04:23, Frederic Weisbecker wrote:
> > In the old times, the whole idle task was considered
> > as an RCU quiescent state. But as RCU became more and
> > more successful overtime, some RCU read side critical
> > section have been added even in the code of some
> > architectures idle tasks, for tracing for example.
> 
> Fantastic!  It fixes RCU CPU stalls that we were seeing on the SMP
> kernel when built for generic Alpha.
> 
> A build of glibc and running its test suite reliably triggers RCU CPU
> stalls when running a kernel built for generic Alpha.  I have just built
> glibc and ran its test suite twice with no RCU CPU stalls with this
> patch against a 3.5.2 kernel!  Nice.  Very nice.
> 
> I see the stable queue is CCed but I note the patch does not apply
> cleanly to the 3.2.y kernel.  It would be nice to have a backport of the
> patches for the 3.2 stable kernel.

Sure.

> 
> So feel free to add:
> 
> Tested-by:  Michael Cree <mcree@...on.net.nz>

Thanks, but I need to refactor the patch, I suspect a problem with CONFIG_PREEMPT.
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