linux-kernel - Re: Another preempt folding issue? (maybe bisect)

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Date:	Fri, 14 Feb 2014 17:21:30 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Stefan Bader <stefan.bader@...onical.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kvm@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com>,
	MASAO TAKAHASHI <masao-takahashi@...no.co.jp>,
	Joerg Roedel <joro@...tes.org>
Subject: Re: Another preempt folding issue? (maybe bisect)

On Fri, Feb 14, 2014 at 04:21:32PM +0100, Borislav Petkov wrote:
> Oh, and just in case this is relatively easy to reproduce and in case we
> don't have any other idea, bisection might be another option. I'm not
> saying you should do it right away - I'm just putting it on the table...

I'm fairly sure you're going to hit the patch that introduced the whole
per-cpu preemption thing. Before that not receiving the IPI wasn't as
bad as it is now.
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