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

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Date:	Thu, 23 Aug 2012 21:32:18 +1200
From:	Michael Cree <mcree@...on.net.nz>
To:	Frederic Weisbecker <fweisbec@...il.com>
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 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.

So feel free to add:

Tested-by:  Michael Cree <mcree@...on.net.nz>

Cheers
Michael.
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