Re: [Xenomai] [PATCH] AT91: SAMA5D3: Adapt Ipipe for AIC5

[Maxime Ripard <maxime.ripard@free-electrons.com>]

On Sat, Jul 05, 2014 at 10:13:51AM +0200, Gilles Chanteperdrix wrote:
> >>> Ok, so, with the changes you mentionned, I can't make the system
> >>> crash anymore (or at least, not as easily as it used to be).
> >>>
> >>> But: - whenever the program mentionned above calls exit(), it 
> >>> stalls. However, ctrl+c makes the program exit properly, and 
> >>> everything seems fine otherwise - whenever we don't link it against
> >>> xenomai, it just hangs. I've not figured out why yet
> >>>
> >>> With CONFIG_XENOMAI and CONFIG_IPIPE disabled, it works fine.
> >>
> >> My answer was wrong, you probably need to keep the
> >> set_backup/clear_backup calls in he ->hold and ->release callbacks, as
> >> the linux interrupt may expect the backup areas to be in sync. Did you
> >> do this, or did you go for the alternative?
> > 
> > I went for the alternative. I'm sending you a v2 with what I have so
> > far, that shows the behaviour I was describing.
> 
> Could you try the following patch?

It actually works much better, thanks!

The above mentionned issues are gone, there's only one last glitch I
guess. The max latency under load is around a few 100's of ms (while
idle, it's actually around 200-300us, which seems more reasonable.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: Digital signature
URL: <http://www.xenomai.org/pipermail/xenomai/attachments/20140707/f7dc479d/attachment.sig>