Re: [LAD] Realtime threads and security

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From: torbenh <torbenh@...>

To: Paul Davis <paul@...>

Cc: <linux-audio-dev@...>

Subject: Re: [LAD] Realtime threads and security

Date: Friday, February 25, 2011 - 3:56 pm

On Fri, Feb 25, 2011 at 10:29:45AM -0500, Paul Davis wrote:

quoted text

> On Fri, Feb 25, 2011 at 10:23 AM, Olivier Guilyardi wrote:
>
> > But let's take JACK for example. It handles setting up realtime scheduling
> > transparently when one creates a jack client. There isn't any extra step
> > necessary. As a supposition, could you imagine that ulatencyd integrates tightly
> > into JACK to provide fine-grained per-client realtime permissions?
>
> ulatencyd is, IMHO, a complete red-herring here. it has nothing to do
> with what JACK does. ulatencyd appearst to me concerned entirely with
> desktop latency and the notion that the "current app" (as represented
> by some form of ongoing user interaction) should be the most
> responsive. this has nothing whatsoever to do with the realtime
> scheduling that JACK is concerned with.
>
> specifically, what JACK does is per-thread, and more significantly its either:
>
> * for threads that it creates (inside libjack) AND knows that they
> need to be RT
> * for threads that the client specifically asks to be RT
>
> you can't do this stuff on a per-process level.

also if cgroups on the system are properly configured, all the server
side needs to do is:

echo "$TID" >/mnt/cgroups/cpu/rt_goup/tasks

i dont think you need a lua interpreter for that :>

> _______________________________________________

quoted text

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torben Hohn
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Messages in current thread:

[LAD] Realtime threads and security, Olivier Guilyardi, (Thu Feb 17, 8:40 pm)

Re: [LAD] Realtime threads and security, Daniel Poelzleithner, (Fri Feb 18, 1:43 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Wed Feb 23, 10:10 am)

Re: [LAD] Realtime threads and security, Daniel Poelzleithner, (Wed Feb 23, 5:24 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 3:23 pm)

Re: [LAD] Realtime threads and security, Paul Davis, (Fri Feb 25, 3:29 pm)

Re: [LAD] Realtime threads and security, torbenh, (Fri Feb 25, 3:56 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 3:54 pm)

Re: [LAD] Realtime threads and security, Paul Davis, (Fri Feb 25, 4:32 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 4:40 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 4:31 pm)

Re: [LAD] Realtime threads and security, Paul Davis, (Fri Feb 25, 4:33 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 25, 4:49 pm)

Re: [LAD] Realtime threads and security, Paul Davis, (Fri Feb 25, 4:54 pm)

Re: [LAD] Realtime threads and security, Paul Davis, (Thu Feb 17, 8:48 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Thu Feb 17, 9:27 pm)

Re: [LAD] Realtime threads and security, Robin Gareus, (Thu Feb 17, 9:54 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Wed Feb 23, 10:22 am)

Re: [LAD] Realtime threads and security, Robin Gareus, (Wed Feb 23, 7:28 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Thu Feb 24, 2:59 pm)

Re: [LAD] Realtime threads and security, Robin Gareus, (Thu Feb 24, 6:01 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Thu Feb 24, 7:09 pm)

Re: [LAD] Realtime threads and security, Fons Adriaensen, (Thu Feb 17, 10:04 pm)

Re: [LAD] Realtime threads and security, Olivier Guilyardi, (Fri Feb 18, 12:17 pm)

Re: [LAD] Realtime threads and security, torbenh, (Fri Feb 18, 11:19 am)

Re: [LAD] Realtime threads and security, Paul Davis, (Thu Feb 17, 9:55 pm)