linux-kernel - Re: How how latent should non-preemptive scheduling be?

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Message-ID: <48D9460C.5040504@yahoo.com>
Date:	Tue, 23 Sep 2008 20:39:56 +0100
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: How how latent should non-preemptive scheduling be?

Sitsofe Wheeler wrote:
> I've been struggling to boot -tip/master - currently it blows up just 
> after printing SLUB information saying:
> 
> BUG: unable to handle kernel NULL pointer dereference at 00000004
> IP: [<c0120078>] account_system_time+0x48/0x120
> *pde = 00000000
> Thread overran stack, or stack corrupted
> Oops: 0002 [#1] PREEMPT

OK this BUG seems to have gone away in the past few hours.

Ingo when you were asking for the ftrace report I presume that would be 
for a non preempt kernel (as a preemptive one only showed a very worst 
latency of 19657 us in one exceptional case)?

-- 
Sitsofe | http://sucs.org/~sits/
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