From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Steven Seeger <sseeger@domain.hid>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai-help] fpu issue
Date: Wed, 21 Jan 2009 20:48:47 +0100 [thread overview]
Message-ID: <49777C1F.4040805@domain.hid> (raw)
In-Reply-To: <51CAD0CE1504444DBE77CBBE51A0135D53407D@slcmail.slc.mew.int>
Steven Seeger wrote:
> Gilles,
>
> Just to clarify, that is all the information I have. I see a single call
> to init_fpu() in i387.c, a single call to xnarch_save_fpu(), and a
> single call to xnarch_restore_fpu().
>
> It almost seems like the second thread doesn't know the FPU was used. I
> should see at least two inits, but seeing one context switch may make
> sense since I now break from my loops in both routines. Plus, with the
> const doubles in func2(), the comparison is optimized out when I look at
> the disassembled output.
Yes, the strcmp trick sucks. You should trace the switch when
current->comm is either "double_test" or "gatekeeper/0".
--
Gilles.
next prev parent reply other threads:[~2009-01-21 19:48 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-20 4:25 [Xenomai-help] fpu issue Steven Seeger
2009-01-20 7:20 ` Gilles Chanteperdrix
2009-01-20 14:34 ` Steven Seeger
2009-01-20 14:49 ` Gilles Chanteperdrix
2009-01-20 14:55 ` Steven Seeger
2009-01-20 14:56 ` Gilles Chanteperdrix
2009-01-21 0:40 ` Steven Seeger
2009-01-21 9:28 ` Gilles Chanteperdrix
2009-01-21 13:30 ` Steven Seeger
2009-01-21 16:42 ` Steven Seeger
2009-01-21 16:48 ` Gilles Chanteperdrix
2009-01-21 17:07 ` Steven Seeger
2009-01-21 17:11 ` Gilles Chanteperdrix
2009-01-21 17:16 ` Steven Seeger
2009-01-21 17:42 ` Steven Seeger
2009-01-21 18:01 ` Gilles Chanteperdrix
2009-01-21 19:41 ` Steven Seeger
2009-01-21 19:48 ` Gilles Chanteperdrix [this message]
2009-01-21 20:05 ` Steven Seeger
2009-01-21 20:08 ` Steven Seeger
2009-01-21 20:45 ` Steven Seeger
2009-01-21 20:47 ` Steven Seeger
2009-01-21 21:13 ` Gilles Chanteperdrix
2009-01-21 21:20 ` Steven Seeger
2009-01-21 21:26 ` Gilles Chanteperdrix
2009-01-21 21:27 ` Steven Seeger
2009-01-21 21:44 ` Steven Seeger
2009-01-21 21:56 ` Gilles Chanteperdrix
2009-01-21 21:57 ` Steven Seeger
2009-01-26 16:13 ` Gilles Chanteperdrix
2009-01-27 10:28 ` [Xenomai-help] fpu issue on PPC ? roderik.wildenburg
2009-01-27 10:35 ` Gilles Chanteperdrix
2009-01-21 16:43 ` [Xenomai-help] fpu issue Steven Seeger
-- strict thread matches above, loose matches on Subject: below --
2008-02-09 1:36 Steven Seeger
2008-02-09 13:29 ` Gilles Chanteperdrix
2008-02-10 15:32 ` Steven Seeger
2008-02-10 15:41 ` Gilles Chanteperdrix
2008-02-10 16:36 ` Gilles Chanteperdrix
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