Re: can I bring Linux down by running "renice -20 cpu_intensive_process"?

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Måns Rullgård wrote:
Lee Revell <[email protected]> writes:

On Fri, 2006-03-10 at 22:01 +0000, Måns Rullgård wrote:
Jan Engelhardt <[email protected]> writes:

Subject: can I bring Linux down by running "renice -20
cpu_intensive_process"?

Depends on what the cpu_intensive_process does. If it tries to
allocate lots of memory, maybe. If it's _just_ CPU (as in `perl
-e '1 while 1'`), you get a chance that you can input some
commands on a terminal to kill it.  SCHED_FIFO'ing or
SCHED_RR'ing such a process is sudden death of course.
Sysrq+n changes all realtime tasks to normal priority.

A nice -20 SCHED_OTHER task is not realtime, only SCHED_FIFO and
SCHED_RR.

Maybe extending sysrq+n to lower the priority of -20 tasks would be a
good idea.

If it runs before the keyboard thread it doesn't matter... But why should this hang anything, when there should be enough i/o to get out of the user process. There's a good fix for this, don't give this guy root any more ;-)

--
   -bill davidsen ([email protected])
"The secret to procrastination is to put things off until the
 last possible moment - but no longer"  -me

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