Wed, 19 Apr 2000 Olaf Petzold wrote:
> Could it be, that the amount of memory which I want to copy must be less than
> PAGE_SIZE???? The structure has a size of about 512 kB!
> The shared memory is allocated by mbuff, no problems. The local copy which I
> try to fill with the contents of the shm structure is a static variable, like
>
> void *thread_code(void *param)
> {
> shm_slut_t slut;
>
> shm_slut->inuse = true;
> memcpy((void *)slut, (void *)shm_slut, sizeof(shm_slut_t));
> shm_slut->inuse = false;
> ..
> }}
Unless you do
static shm_slut_t slut;
you'll get a *local* variable, rather than a static variable. That is, the
kernel crashes already when trying to allocate space for the variable (when
entering thread_code()). It's allocated from the stack...
> kmalloc can only allocate about 131072 Bytes. I have heard about vmalloc()
> inside kernel space - is this the solution to allocate an local memory region?
Probably, but I don't think this is the problem that generates the crasch. If
you try to kmalloc() too big a block, you should get an error return (to be
handled nicely by your code!) rather than a kernel crash.
David Olofson
Programmer
Reologica Instruments AB
Scheelev�gen 30
S-223 63 LUND
+46 (0)46 - 12 77 60
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