linux-kernel - Re: perf sched record hangs machine

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Message-ID: <20090923073253.GA18022@elte.hu>
Date:	Wed, 23 Sep 2009 09:32:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>,
	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Chris Malley <mail@...ismalley.co.uk>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf sched record hangs machine


* Peter Zijlstra <peterz@...radead.org> wrote:

>         .size   default_send_IPI_self, .-default_send_IPI_self
> 
> Which seems to suggest that cmove is in __prepare_ICR, but I'm not 
> sure how that can cause a page-fault, as that function is rather 
> pointer-less.
> 
> Did it maybe delay evaluating apic->dest_logical that late, it appear 
> to be the first usage of that argument?
> 
> Ingo, any ideas?

Yeah, the problem is:

[    0.042445] Local APIC not detected. Using dummy APIC emulation.

we shouldnt be trying to program the lapic in that case - all ops should 
be a NOP, including send-ipi-self. Cyrill?

	Ingo
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