From: James Morris <jmorris@namei.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Stephen Smalley <sds@tycho.nsa.gov>,
James Carter <jwcart2@tycho.nsa.gov>,
Paul Moore <paul.moore@hp.com>, Eric Paris <eparis@redhat.com>
Subject: Re: [bug] very high non-preempt latency in context_struct_compute_av()
Date: Mon, 4 Jun 2007 09:25:11 -0400 (EDT) [thread overview]
Message-ID: <Line.LNX.4.64.0706040924040.11109@d.namei> (raw)
In-Reply-To: <20070604112745.GA26350@elte.hu>
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@namei.org>
next prev parent reply other threads:[~2007-06-04 13:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-04 11:27 [bug] very high non-preempt latency in context_struct_compute_av() Ingo Molnar
2007-06-04 13:25 ` James Morris [this message]
2007-06-04 14:17 ` Ingo Molnar
2007-06-04 21:11 ` Paul Moore
2007-06-04 21:39 ` Stephen Smalley
2007-06-04 22:48 ` Paul Moore
2007-06-04 22:54 ` James Morris
2007-06-07 19:34 ` Stephen Smalley
2007-06-07 19:51 ` Ingo Molnar
2007-06-07 20:11 ` James Morris
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