On 16/05/06, fritzsch <[email protected]> wrote:
Hallo,
i have one process, which i want to run on a cpu (> CPU0). The special
thing here is, that this process is very time critical and should NOT
be interrupted by anything (cpusets/cpus_allowed would not be enough).
(the process is not doing any system calls and is communicating to the
world by shared memory).
so i wanted to run the process on a CPU1, when all irqs are disabled and
so the process could not be interrupted.
I tried very simple to
(1) migrate all processes to CPU0 by cpu_set_allowed
(2) gave my process (running on CPU1) the highest priority
(3) run schedule and make sure that the irqs are disables
(disable_irqs())
...
Some ideas :
- Play with CPU affinity : "man sched_setaffinity" / "man sched_getaffinity" [1]
- Try a RealTime patched kernel (Ingo's -rt patchset) and set the
processes nice level to least nice & RT priority to the max [2]
- Implement the code as a kernel module if it really is that time critical
[1] http://www.linuxjournal.com/article/6799
[2] http://www.captain.at/howto-linux-real-time-patch.php
--
Jesper Juhl <[email protected]>
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Plain text mails only, please http://www.expita.com/nomime.html
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