Messages in this thread | | | Date | Thu, 16 Mar 2006 16:15:33 -0500 | From | Bill Davidsen <> | Subject | Re: can I bring Linux down by running "renice -20 cpu_intensive_process"? |
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Måns Rullgård wrote: > Lee Revell <rlrevell@joe-job.com> writes: > >> On Fri, 2006-03-10 at 22:01 +0000, Måns Rullgård wrote: >>> Jan Engelhardt <jengelh@linux01.gwdg.de> 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 (davidsen@tmr.com) "The secret to procrastination is to put things off until the last possible moment - but no longer" -me
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