From: Jan Kiszka <jan.kiszka@domain.hid>
To: Jeroen Van den Keybus <jeroen.vandenkeybus@domain.hid>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] Page faults
Date: Tue, 28 Feb 2006 16:05:42 +0100 [thread overview]
Message-ID: <440466C6.9050706@domain.hid> (raw)
In-Reply-To: <fd6a47a90602280622o4cfb2b79g@domain.hid>
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Jeroen Van den Keybus wrote:
> I'm observing a considerable amount of Page Faults (5090 after an hour or
> so), each one associated with a MSW increase in /proc/xenomai/stat. I'm
> missing RT deadlines on those occasions and I want to fix it, so I would
> like to know what Page Faults actually are.
>
Maybe not all of your user memory is cleanly locked and got swapped out
(swapping activated?). If you don't see kernel oopses and your programs
don't receive segfaults, these faults are references to swapped out or
not yet mapped in pages. BTW, what does the kernel console tell you?
The deadline misses as a result are "normal": your RT thread gets
switched to secondary mode to handle the fault, and handling it may take
some time...
Jan
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next prev parent reply other threads:[~2006-02-28 15:05 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-28 14:22 [Xenomai-help] Page faults Jeroen Van den Keybus
2006-02-28 15:05 ` Jan Kiszka [this message]
2006-02-28 15:29 ` Jeroen Van den Keybus
2006-02-28 16:29 ` Jan Kiszka
2006-02-28 16:31 ` Philippe Gerum
2006-02-28 17:08 ` Jeroen Van den Keybus
-- strict thread matches above, loose matches on Subject: below --
2007-04-16 19:49 [Xenomai-help] page faults Jeff Weber
2007-04-16 20:05 ` Philippe Gerum
2007-04-16 20:20 ` Jeff Weber
2007-04-16 20:43 ` Gilles Chanteperdrix
2007-04-16 21:27 ` Jeff Weber
2007-04-16 21:34 ` Gilles Chanteperdrix
2007-04-17 13:21 ` Jeff Weber
2007-04-17 19:17 ` Gilles Chanteperdrix
2007-04-17 20:59 ` Jeff Weber
2007-04-20 16:43 ` Jeff Weber
2007-04-20 17:24 ` Philippe Gerum
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