linux-kernel - Re: Regression in RCU subsystem in latest mainline kernel

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Date:	Tue, 25 Jun 2013 17:36:25 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Rojhalat Ibrahim <imr@...chenk.de>,
	linux-kernel@...r.kernel.org
Subject: Re: Regression in RCU subsystem in latest mainline kernel

On Tue, 2013-06-25 at 17:19 +1000, Michael Ellerman wrote:
> Here's another trace from 3.10-rc7 plus a few local patches.
> 
> We suspect that the perf enable could be causing a flood of
> interrupts, but why
> that's clogging things up so badly who knows.

Additionally, perf being potentially NMIs , we might be hitting a bad
case of reentrance in RCU ... hard to tell.

Cheers,
Ben.


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