linux-kernel - Re: Another preempt folding issue?

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Message-ID: <20140212115412.GW27965@twins.programming.kicks-ass.net>
Date:	Wed, 12 Feb 2014 12:54:12 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stefan Bader <stefan.bader@...onical.com>
Cc:	Borislav Petkov <bp@...en8.de>,
	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?

On Wed, Feb 12, 2014 at 12:09:29PM +0100, Stefan Bader wrote:
> Something else here I run a kernel with CONFIG_PREEMPT not set and NR_CPUS
> limited to 8 (for the 32bit kernel). So the default apic driver is used. Since
> default_send_IPI_mask_logical is only used from there, I assume the trace you
> got does the same. Maybe something there is wrong which would explain why we
> only see it on 32bit hosts.

Can you try with a different APIC driver to test this?
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