Hi,
We are currently moving from xenomai 2 to xenomai 3. I installed xenomai
3.0.5, and all seems to be working, with low latency.
I am now trying to get our legacy code to work on xenomai 3 using the
transition kit.
Our program crashes on heap allocation (rt_heap_alloc function) with
error code -11 (resource temporarily unavailable).
The rt_heap_alloc function was called successfully a few times before
the crash, so I first assumed not enough heap was reserved, so I
recompiled the kernel with more and more heap:
CONFIG_XENO_OPT_SYS_HEAPSZ=524288
This does not solve the issue. We also tried tooling with the
'--mem-pool-size' argument, with no success.
To check things I created a toy executable which just allocate memory:
--
void alloc (char *name, int elemSize) {
rt_printf("allocating for %d | ",elemSize);
int rc;
RT_HEAP heap;
void *ptr;
rc = rt_heap_bind(&heap,name,TM_NONBLOCK);
if(!rc) return;
rc = rt_heap_create(&heap,name,(size_t)(elemSize),H_SHARED);
if(rc) return;
rc = rt_heap_alloc(&heap,(size_t)(elemSize),TM_NONBLOCK,&ptr);
if (rc) {
printf("%d %s\n",rc,strerror(-rc));
return;
}
printf("OK\n");
return;
}
int main(int, char** argv){
int nb_ints = atoi(argv[1]);
char *name = "test";
alloc(name,nb_ints*sizeof(int));
}
--
The output surprised me: allocation works for some values but not for
others.
for((nb_ints=2000;nb_ints<=132000;nb_ints+=2000)); do
xenomai_heap_test $nb_ints; done
results in:
allocating for 8000 | OK
allocating for 16000 | OK
[...]
allocating for 64000 | OK
allocating for 72000 | -11 Resource temporarily unavailable
allocating for 80000 | -11 Resource temporarily unavailable
allocating for 88000 | OK
allocating for 96000 | OK
[...]
allocating for 128000 | OK
allocating for 136000 | -11 Resource temporarily unavailable
allocating for 144000 | -11 Resource temporarily unavailable
[...]
allocating for 168000 | -11 Resource temporarily unavailable
allocating for 176000 | OK
allocating for 184000 | OK
allocating for 192000 | OK
allocating for 200000 | OK
allocating for 208000 | OK
allocating for 216000 | -11 Resource temporarily unavailable
allocating for 224000 | -11 Resource temporarily unavailable
[...]
allocating for 328000 | -11 Resource temporarily unavailable
allocating for 336000 | -11 Resource temporarily unavailable
allocating for 344000 | OK
allocating for 352000 | OK
[...]
allocating for 384000 | OK
allocating for 392000 | -11 Resource temporarily unavailable
[...]
allocating for 520000 | -11 Resource temporarily unavailable
allocating for 528000 | -11 Resource temporarily unavailable
Anything we are doing very wrong ?
Vincent
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