Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
> > [EMAIL PROTECTED] wrote:
> > > Xenomai Version : 2.2-rc2
> > > Skin : native
> > > Kernel : 2.4.25
> > > Arch.: PPC
> > >
> > > I try to allocate as much memory as possible with the functions :
> > > rt_heap_create and
> > > rt_heap_alloc.
> > > (see also "Xenomai heap services" in this mailing list; see source
> > > attached)
> > >
> > > When I try to use the allocated memory with memset, the Xenomai-task
> > > crashes with a "Segmentation fault".
> > >
> > > Is memset allowed to be used with Xenomai heaps ?
> >
> > memset should work with Xenomai heaps, I suspect your problem is rather
> > that the memory is not really allocated until you memset it, which fails
> > when no memory is available. In this case, calling memset on memory
> > allocated with malloc should segfault the same way when the system
> > memory is exhausted. IIRC, this behaviour is documented in mlockall
> > manual page.
>
> I wonder if this "virtual allocation" also applies to vmalloc'ed memory
> like in this case. I don't think so, or the kernel would oops as well.
On some architectures vmalloced memory is only added to a process page
directory when the fault occurs. I do not know if the RAM allocation is
delayed until then, though.
--
Gilles Chanteperdrix.
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