On 06/18/2011 10:50 AM, Philippe Gerum wrote:
> On Tue, 2011-06-14 at 14:47 +0200, [email protected]
> wrote:
>> Perhaps this may help:
>> I instrumented src/common/sem_heap.c and ksrc/nucleus/heap.c with printf
>> and printk (see appended files) and this is the output:
>>
>> 1:mrconfig:~ # latency
>> 2:xeno_init_private_heap
>> 3:map_sem_heap syscall 0
>> 4:xeno_map_heap open 3
>> 5:xnheap_ioctl private data: 00000000
>> 6:xeno_map_heap ioctl 0 handle 0xc7dd9210
>> 7:xnheap_mmap 00000000 00000000
>> 8:xeno_map_heap 0xffffffff
>> 9:Xenomai: mmap local sem heap: No such device or address
>> 10:mrconfig:~ #
>>
>>
>> It looks like (if I figured it out correctly) as if in function
>> sem_heap.c->xeno_map_heap() (which is called from xeno_init_privat_heap()
>> via function map_sem_heap()) the ioctl-Call fails.
>> xeno_map_heap() passes correctly an argument unequal NULL as third parameter
>> to ioctl() (line6), but in kernel space function xnheap_ioctl() the 3.
>> parameter arrives as NULL(line 5). This sets file->private_data to NULL
>> which in turn lets xnheap_mmap() fail, as this function expects
>> file->private_data != NULL (line7).
>> Therefore xnheap_mmap() returns -ENIXIO to xeno_map_heap() which outputs the
>> error message " Xenomai: mmap local sem heap: No such device or address".
>> The one million dollar question is, why the 3. parameter of ioctl() mutates
>> to NULL. Any idea?
>>
>> If I can do anything else, let me know.
>>
>
> You will need these patches to run linux 2.4.25 over 2.5.6. The first
> one fixes the ioctl() issue.
> http://git.xenomai.org/?p=xenomai-rpm.git;a=commit;h=c2a24b90667e12d0614e5d8442dba74f137f9d4d
> http://git.xenomai.org/?p=xenomai-rpm.git;a=commit;h=bebc2a8e6b430c99041800330dc6061665371d90
>
> Note: the switch test does not seem to be running correctly on my
> icecube (albeit the latency one does), somehow linux reschedule events
> get lost. For this reason, I would not consider the current state as
> being production-grade.
How do you see that reschedule events are lost? Does this happen also on
other systems?
--
Gilles.
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