From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>
Subject: Re: [Xenomai-core] x86: Endless minor faults
Date: Wed, 01 Jul 2009 14:24:45 +0200 [thread overview]
Message-ID: <4A4B558D.20307@domain.hid> (raw)
In-Reply-To: <4A4B4ED4.6020208@domain.hid>
Jan Kiszka wrote:
> Jan Kiszka wrote:
>> It's still unclear what goes on precisely, we are still digging, but the
>> test system that can produce this is highly contended.
>
> Short update: Further instrumentation revealed that cr3 differs from
> active_mm->pgd while we are looping over that fault, ie. the kernel
> tries to fixup the wrong mm. And that means we have some open race
> window between updating cr3 and active_mm somewhere (isn't switch_mm run
> in a preemptible manner now?).
Maybe the rsp is wrong and leads you to the wrong active_mm ?
>
> As a first shot I disabled CONFIG_IPIPE_DELAYED_ATOMICSW, and we are now
> checking if it makes a difference. Digging deeper into the code in the
> meanwhile...
As you have found out in the mean time, we do not use unlocked context
switches on x86.
--
Gilles
next prev parent reply other threads:[~2009-07-01 12:24 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-29 17:35 [Xenomai-core] x86: Endless minor faults Jan Kiszka
2009-06-29 18:09 ` Philippe Gerum
2009-06-29 18:20 ` Jan Kiszka
2009-06-30 8:32 ` Jan Kiszka
2009-06-30 8:36 ` Gilles Chanteperdrix
2009-06-30 8:44 ` Jan Kiszka
2009-06-30 8:42 ` Gilles Chanteperdrix
2009-06-30 8:56 ` Jan Kiszka
2009-06-30 9:20 ` Philippe Gerum
2009-06-30 9:21 ` Gilles Chanteperdrix
2009-06-30 9:25 ` Philippe Gerum
2009-06-30 9:26 ` Gilles Chanteperdrix
2009-06-30 9:27 ` Philippe Gerum
2009-06-30 9:34 ` Gilles Chanteperdrix
2009-06-30 16:11 ` Jan Kiszka
2009-07-01 11:56 ` Jan Kiszka
2009-07-01 12:05 ` Jan Kiszka
2009-07-01 12:24 ` Gilles Chanteperdrix [this message]
2009-07-01 12:39 ` Jan Kiszka
2009-07-01 12:41 ` Gilles Chanteperdrix
2009-07-01 12:41 ` Jan Kiszka
2009-07-01 15:51 ` Gilles Chanteperdrix
2009-07-01 16:01 ` Jan Kiszka
2009-07-01 16:04 ` Jan Kiszka
2009-07-01 17:56 ` Jan Kiszka
2009-07-01 18:15 ` Philippe Gerum
2009-07-01 18:27 ` Philippe Gerum
2009-07-01 18:58 ` Jan Kiszka
2009-07-01 19:14 ` Jan Kiszka
2009-07-02 2:05 ` Gilles Chanteperdrix
2009-07-02 6:24 ` Jan Kiszka
2009-07-02 6:59 ` Gilles Chanteperdrix
2009-07-02 7:16 ` Jan Kiszka
2009-07-02 7:44 ` Gilles Chanteperdrix
2009-07-01 18:56 ` Jan Kiszka
2009-07-02 7:11 ` Philippe Gerum
2009-07-02 17:14 ` Jan Kiszka
2009-07-03 14:54 ` Gilles Chanteperdrix
2009-07-03 15:06 ` Jan Kiszka
2009-07-04 16:39 ` Gilles Chanteperdrix
2009-07-05 12:01 ` Jan Kiszka
2009-07-05 14:56 ` Gilles Chanteperdrix
2009-07-05 17:12 ` Jan Kiszka
2009-07-06 7:54 ` Gilles Chanteperdrix
2009-07-07 18:45 ` Jan Kiszka
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