[pulseaudio-discuss] RtKit help

[Lennart Poettering]

On Wed, 06.01.10 05:53, David Henningsson (launchpad.web at epost.diwic.se) wrote:

> Thanks for the pointers, they were most helpful.
> 
> First, RtKit version is 0.4-0ubuntu2, OS is Ubuntu 10.04 (the development
> version). If that matters.
> 
> I had trouble getting rtkit-test succeeding at first, and a long story
> short, I was likely affected by this bug:
> http://www.spinics.net/lists/linux-fsdevel/msg28757.html
> ...so I had to try an bleeding edge kernel, in which rtkit-test works.
> 
> After some additional debugging, I found that my original problem was that
> the rt-priority I requested was too high for rtkit to accept. So the
> permission problem comes from rtkit, the process_set_realtime() call
> returns -EPERM. So an additional question: would it be possible to either
> detect that highest value rtkit can deliver, or say "hey, I want x, but if
> you only can give me y, do that instead of failing"? In worst case, I
> could do a binary search, but I'm glad if that could be avoided :-)
> The same would be nice for the maximum value of RLIMIT_RTTIME.

Hmm, yes, I guess that would make sense indeed. Adding this as props
should be very simple. 

> This is one of the things I love most about Linux/FOSS, the ability to
> debug wherever you want. I ended up inserting some debug prints in
> rtkit-daemon to nail the problem down - had rtkit been a Windows system
> service delivered by Microsoft, I'd probably still be stuck!

He. Free Software also lives from contributions. So if you want to see
these properties added quickly, then prep a clean patch and I'll merge
it. ;-)

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/           GnuPG 0x1A015CC4