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SubjectRe: [PATCH] protect migration/%d etc from sched_setaffinity
On Thu, Jul 31, 2003 at 04:17:03PM -0700, Andrew Morton wrote:
> Joe Korty <joe.korty@ccur.com> wrote:
> >
> > I'd like to be able to write shell scrips that operate on the set of
> > /proc/[0-9]* without having to know which of the ever-changing list
> > of processes need to be avoided and which not.
>
> Like this?
>
> #!/bin/sh
>
> #
> # can_set_affinity pid
> #
> can_set_affinity()
> {
> if [ "$(cat /proc/$1/maps)" != "" ]
> then
> return 0
> fi
> if head -1 /proc/$1/status | egrep "events|migration"
> then
> return 1
> else
> return 0
> fi
> }
>
> if can_set_affinity $1
> then
> echo can set affinity of pid $1
> else
> echo cannot set affinity of pid $1
> fi


Good stuff. I reduced it to (having trouble easily reading the original
output):

name=$(head -1 /proc/$1/status | awk '{print $2}')
echo -n '[' $1 '] ' $name ' '
if [ "$(cat /proc/$1/maps)" == "" ]
then
echo SAFE
else
echo changeable
fi

It catches all those that need catching, plus denies changes to some
daemons that could survive sched_setaffinity: khubd, kirqd, pdflush*,
kswapd0, scsi_eh_[01], ahc_dv_[01], kseriod, and kjournald*.

Joe
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