From: Alois Zoitl <alois@gmx.at>
To: Pieter-Jan Busschaert <pieterjan.busschaert@gmail.com>
Cc: ecos-discuss@ecos.sourceware.org
Subject: Re: [ECOS] Thread activation disturbed by lower priority threads]
Date: Thu, 23 Aug 2007 20:38:00 -0000 [thread overview]
Message-ID: <46CDF045.7080303@gmx.at> (raw)
In-Reply-To: <950a36fb0708170108s3d66dde6yc42e5bd49efaff36@mail.gmail.com>
Hi
> To have more detailed info about this, you could turn on kernel
> instrumentation and enable CLOCK, MUTEX and SCHEDULER events. For more
> info, see here :
> http://ecos.sourceware.org/docs-latest/user-guide/kernel-instrumentation.html
I tried a little bit with the kernel instrumentation, but could not get
any results I could handle.
What i did was to further investigate which of my mutexes was the
problematic one. And it is the one
I initiali thought will make a problem.
This mutex locks at some stage each of my threads. As soon as I remove
this mutex (with special test apps this is not a problem) the scheduling
is as expected. As soon as I add the mutex I get the problem again. Even
the thread which is disturbed will access the mutex later in its
execution its activation is delayed. It looks as this mutex gets an very
high priority although I use priority inheritance.
For my current test I found it that priority inversion will not be a big
problem. At least currently. So i'm fine without a priority inversion
protocol.
Nonetheless Its ok for me to further investigate the problem if I can
help to improve eCos.
cheers
Alil
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Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
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next prev parent reply other threads:[~2007-08-23 20:38 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-17 7:34 Alois Z.
2007-08-17 8:08 ` Pieter-Jan Busschaert
2007-08-17 8:14 ` Andrew Lunn
2007-08-17 8:46 ` Pieter-Jan Busschaert
2007-08-17 8:59 ` Andrew Lunn
2007-08-23 20:38 ` Alois Zoitl [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-08-07 14:02 Alois Z.
2007-08-07 14:41 ` Andrew Lunn
2007-08-07 17:35 ` Paul D. DeRocco
2007-08-07 18:55 ` Andrew Lunn
[not found] ` <20070808075810.250840@gmx.net>
2007-08-08 8:10 ` Andrew Lunn
2007-08-16 20:05 ` Alois Zoitl
2007-08-16 20:22 ` Andrew Lunn
[not found] ` <20070817072849.22110@gmx.net>
2007-08-17 8:08 ` Andrew Lunn
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