Re: [linux-audio-dev] How to access "real-time" capabilities - Linux-audio-dev

13 Jun 2005

Lee Revell wrote:
...
  On Fri, 2005-06-10 at 11:12 -0700, Ian wrote:
  Can anyone tell me *very briefly* what is the
current
 state of play regarding realtime-lsm in the 2.6.*
 kernels and whether this feature (or something like it
 ) is likely to be introduced into the kernel anytime
 soon.  
 realtime-lsm should be considered deprecated.  The solution accepted by
 Linus is rlimit based.  I think this will be in 2.6.12 (seems to be in
 the release candidates).  Check the archives for "rlimit".
 This will require patching PAM and bash. 
In the interim you could try set_rtlimit:
  http://www.physics.adelaide.edu.au/~jwoithe/set_rtlimits-1.1.0.tgz
It allows you to access the enhanced rlimits (ie: RT scheduling and nice
levels) under 2.6.12 kernel or later without needing to patch anything.  In
fact, even once PAM/etc are patched this might be preferred by some since it
allows you to control the limits based on the program being run; so for
example you can allow /usr/local/bin/ardour to run at realtime priority 50
while /usr/bin/yes (for example) can't.
Regards
  jonathan