Re: Re: [Xenomai-help] Error: cat: /proc/xenomai/stat: Cannot allocate

["M. Koehrer" <mathias_koehrer@domain.hid>]

Hi Philippe, 

I can. Which of the many values in /proc/vmstat is the relevant one to check?

Regards

Mathias

> On Fri, 2007-02-02 at 12:23 +0100, Philippe Gerum wrote:
> > On Fri, 2007-02-02 at 10:51 +0100, Gilles Chanteperdrix wrote:
> > > Philippe Gerum wrote:
> > > > On Fri, 2007-02-02 at 10:33 +0100, Philippe Gerum wrote:
> > > > 
> > > >>On Fri, 2007-02-02 at 09:43 +0100, M. Koehrer wrote:
> > > >>
> > > >>>Hi everybody,
> > > >>>
> > > >>>I have a strange issue frequently when reading /proc/xenomai/stat.
> > > >>>I do a cat /proc/xenomai/stat and I get an "Cannot allocate memory"
> error.
> > > >>>This happens typcially after I have started and terminated by
> application that uses a number of tasks.
> > > >>>I am able to reproduce it deterministically...
> > > >>>While the application is running, I can see the stat values
> perfectly.
> > > >>>Here is the head output of all /proc/xenomai/* files:
> > > >>
> > > >>At first sight looking at the code, there seems to be a memory leak
> > > >>caused by an unfree kmalloc() block in the sched & stat sequence
> > > >>routines. Will confirm and fix. Thanks,
> > > >>
> > > > 
> > > > 
> > > > Not confirmed for the leakage part regarding kmalloc(). We do have a
> > > > seq_release_private() freeing the allocated block, so back to square
> #1.
> > > > This said, some kernel memory is not released somewhere, as running
> > > > vmstat tells me here.
> > > > 
> > > > Btw, is the rest of your system functional after the error occurs, or
> is
> > > > a reboot needed afterwise?
> > > 
> > > Do you observe the same leakage without the nocow patch ?
> > > 
> > 
> > Yes, 2.6.19-1.6-04 (without nowcow) has the same problem. But the
> > interesting things is that reading /proc/interrupts in loop seems to
> > silently eat kernel memory by small chunks too. I'm now trying on a
> > vanilla kernel.
> > 
> 
> Confirmed. A vanilla 2.6.19 silently eats memory when
> reading /proc/interrupts in loop. Mathias, could you please confirm this
> on your box too? TIA,
> 
> -- 
> Philippe.
> 
> 
> 

-- 
Mathias Koehrer
mathias_koehrer@domain.hid


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