From: Armin Steinhoff <armin@steinhoff.de>
To: Nicholas Mc Guire <der.herr@hofr.at>
Cc: Monica Puig-Pey <puigpeym@unican.es>, linux-rt-users@vger.kernel.org
Subject: Re: I/O operations priority in RTOS
Date: Sun, 05 Jun 2011 10:46:55 +0200 [thread overview]
Message-ID: <4DEB427F.9020104@steinhoff.de> (raw)
In-Reply-To: <20110604234214.GA30640@opentech.at>
Nicholas Mc Guire wrote:
> On Sat, 04 Jun 2011, Monica Puig-Pey wrote:
>
>> Hello,
>> I'm studying how to develop drivers in a real time OS and how do they
>> work. I'm using Ubuntu 10.04 with the 2.6.31-11-rt patch installed.
>> I would like to know the priority when executing open(), read(), write()
>> and close() operations.
>> In my example the thread which is using the driver runs with 10 RTPRIO,
>> but I don't know what happens in kernel context with the priority when
>> running the I/O operations.
>> Thank you for your help, I don't know where to learn about this.
>>
> []
> Also when using bottom half mechanisms you need to take into account the
> priority of the kernel thread that manages the defered work items, so
> rt-drivers may have a different structure than normal drivers.
That's the reason why I prefer UIO based user space drivers !
--Armin
> hofrat
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next prev parent reply other threads:[~2011-06-05 8:37 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-04 11:48 One Interrupted Threads per Interrupt line? Monica Puig-Pey
2011-06-04 12:03 ` I/O operations priority in RTOS Monica Puig-Pey
2011-06-04 12:30 ` kernel threads in drivers using the RT patch Monica Puig-Pey
2011-06-06 11:47 ` Changing Kernel thread priorities Monica Puig-Pey
2011-06-06 11:54 ` Rolando Martins
2011-06-06 11:58 ` Monica Puig-Pey
2011-06-06 16:49 ` Mark Hounschell
2011-06-07 8:40 ` Monica Puig-Pey
2011-06-07 9:14 ` Mark Hounschell
2011-06-07 9:46 ` Mark Hounschell
2011-06-07 18:34 ` Monica Puig-Pey
2011-06-07 18:55 ` Mark Hounschell
2011-06-10 10:12 ` Monica Puig-Pey
2011-06-06 18:20 ` Armin Steinhoff
2011-06-04 23:42 ` I/O operations priority in RTOS Nicholas Mc Guire
2011-06-05 8:46 ` Armin Steinhoff [this message]
2011-06-05 9:25 ` Jan Kiszka
2011-06-05 22:39 ` Armin Steinhoff
2011-06-05 23:09 ` Jan Kiszka
2011-06-05 9:28 ` Nicholas Mc Guire
2011-06-05 9:44 ` Jan Kiszka
2011-06-05 22:29 ` Nicholas Mc Guire
2011-06-05 23:00 ` Jan Kiszka
2011-06-06 0:21 ` Nicholas Mc Guire
2011-06-06 20:35 ` Jan Kiszka
2011-06-06 7:41 ` Armin Steinhoff
2011-06-06 20:48 ` Jan Kiszka
2011-06-05 22:32 ` Armin Steinhoff
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