Måns Rullgård wrote:
Bill Davidsen <[email protected]> writes:
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...
Of course not, but that's not generally the case.
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 ;-)
Ever heard of bugs? Anyone developing a program can make a mistake.
If the program runs with realtime scheduling a bug that makes it enter
an infinite loop (or do something else that hogs the CPU) can be
difficult to find since it rather efficiently locks you out.
Please google "emoticons" and find out what those funny characters at
the end of the of the paragraph you quoted really mean. Sheesh!
--
bill davidsen <[email protected]>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
