[ltp] Re: New thinkpad recomendation

[Michael Karcher]

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Am Donnerstag, den 11.12.2008, 19:53 +0000 schrieb Richard Neill:
> > Another point: IIRC users can only make their
> > processes nicer, but never return to the original priority. How do you
> > (Richard) unnice them if you need them?
> You can use renice to get down to 0 again - use
>    renice  NICENESS  PID
> where NICENESS is 0..20  (unless you are root, in which case you can=20
> have a negative number).
No. It doesn't work on Linux. The manpage says:

BUGS
     Non super-users can not increase scheduling priorities of their own pr=
o=E2=80=90
     cesses, even if they were the ones that decreased the priorities in th=
e
     first place.

And that's still true:
karcher@hermes2:~$ sleep 1000 &
[1] 5210
karcher@hermes2:~$ ps -o nice 5210
 NI
  0
karcher@hermes2:~$ renice 10 5210
5210: old priority 0, new priority 10
karcher@hermes2:~$ ps -o nice 5210
 NI
 10
karcher@hermes2:~$ renice 0 5210
renice: 5210: setpriority: Keine Berechtigung
karcher@hermes2:~$ ps -o nice 5210
 NI
 10

> On a laptop with a single-user, I'd also consider that passwordless=20
> sudo, or a setuid-root perl script is an acceptable security choice.
Of course. That would be the way to circumvent this restriction.

Regards,
  Michael Karcher

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