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Is there any other way , a preferred way, to manage modules auto unloading than setting a cron job (rmmod -a )?
Thanks for your time.
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What modules are you talking about and why exactly do you want to force an unload? Please be more specific.
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Try loading modules with "insmod -k":
From insmod.old man page:
       -k, --autoclean
              Set the auto-clean flag on the module.  This flag will  be  used
              by  kerneld(8) to remove modules that have not been used in some
              period of time -- usually one minute.Offline