linux-kernel - Re: [bug] very high non-preempt latency in context_struct_compute

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Message-ID: <Line.LNX.4.64.0706040924040.11109@d.namei>
Date:	Mon, 4 Jun 2007 09:25:11 -0400 (EDT)
From:	James Morris <jmorris@...ei.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	James Carter <jwcart2@...ho.nsa.gov>,
	Paul Moore <paul.moore@...com>, Eric Paris <eparis@...hat.com>
Subject: Re: [bug] very high non-preempt latency in context_struct_compute_av()

On Mon, 4 Jun 2007, Ingo Molnar wrote:

> 
> a simple ssh login triggers a ~130 msecs non-preemptible latency even 
> with CONFIG_PREEMPT enabled, on a fast Core2Duo CPU (!).

Thanks for the report.

> 
> the latency is caused by a _very_ long loop in the SELinux code:
> 
>     sshd-4828  0.N.. 465894us : avtab_search_node (context_struct_compute_av)

What do the 0DNs fields mean and what did you use to create this trace?


- James
-- 
James Morris
<jmorris@...ei.org>
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