[Bug 178151] setting /sys/kernel/uids/<uid>/cpu_share to 1 causes the scheduler to give most of the cpu time to this uid

[dm]

Public bug reported:

steps to reproduce on kubuntu hardy alpha 2:
1)create new user.
2)set /sys/kernel/uids/<his_uid>/cpu_share to "1"
3)run (as this new user) process which is infinitive loop, for example this ruby script:
x=1
while (true)
  x=x+1
end
4)try to run something as the root user (while this script runs).
instead of getting maximum ~0.00% of cpu time (1/(1+1024)), this script is given much more cpu time.
this doesn't occur if /sys/kernel/uids/<his_uid>/cpu_share if set to "16" for example.

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

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setting /sys/kernel/uids/<uid>/cpu_share to 1 causes the scheduler to give most of the cpu time to this uid
https://bugs.launchpad.net/bugs/178151
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