Will Dapper support RLIMIT_RTPRIO?

Lee Revell rlrevell at joe-job.com
Fri Feb 3 22:17:44 GMT 2006


On Fri, 2006-02-03 at 02:04 -0800, Matt Zimmerman wrote:
> On Thu, Feb 02, 2006 at 04:48:20PM -0500, Lee Revell wrote:
> > The new RLIMIT_RTPRIO was introduced in kernel 2.6.12 to selectively
> > allow non-root processes to run tasks with realtime priority.  This is
> > essential if we ever want reliable multimedia performance without
> > forcing users to run as root.
> > 
> > Supporting this new rlimit requires some changes to glibc, bash, and
> > PAM.  It was added to glibc 6 months ago:
> > 
> > http://sourceware.org/ml/libc-hacker/2005-06/msg00005.html
> > 
> > Presumably Dapper will ship with a post 2.6.12 kernel - so will Dapper
> > ship with full userspace support for this new rlimit?
> > 
> > I checked the current glibc sources and these new RLIMITs are not yet
> > supported...
> 
> Dapper feature freeze begins 2006-02-23.  If you submit the appropriate
> non-invasive patches in time for them to be merged before that date, I see
> no reason not to include them.  However, as yet, there is no motive to push
> ahead of our upstreams on this point except for your request.

Is there any chance of shipping with PAM 0.80 or are we stuck with 0.79?

If PAM is frozen at 0.79 I believe there are backported PAM 0.79 patches
available, I'll try to track them down.

Lee




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