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    • Lennart Poettering's avatar
      pam: do not sort user sessions into their own cgroups in the 'cpu' hierarchy by default · 5e4ef5e0
      Lennart Poettering authored
      While this offers quite a few benefits for normally scheduled processes
      this breaks RT scheduling for all user processes, since we do not assign
      an RT share to the cgroups created via this mechanism. If the user
      cgroups have no RT share assigned no member process can make use of RT
      functionality. However, software like JACK and PA/rtkit assume that RT
      is available in some way or another, either via RLIMIT_RTPRIO or via
      some privileged service. Creating implicit cpu cgroups but not adding
      RT shares to them hence breaks these applications.
      
      There is no sane way to implicitly add RT shares to these groups, since
      they are pulled from a global, limited pool and it would hence be very
      hard to make this work without limiting the number of concurrent
      sessions, or constantly rewriting the cpu share settings of already
      logged in session cgroups.
      
      Most likely this issue needs to be fixed in-kernel because we can enable
      this feature by default again.
      5e4ef5e0
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