On Sun, Nov 01, 2009 at 12:18:03PM +0100, Klistvud wrote: > Howdie, fellow Debianites! > > Is there a command for passing arguments to a running kernel module on > the fly, without rmmoding and re-modprobing it?
Yes . /proc/module/$MODULE/parameters For instance, let's look at the module 'thermal' $ /sbin/modinfo thermal filename: /lib/modules/2.6.26-2-amd64/kernel/drivers/acpi/thermal.ko license: GPL description: ACPI Thermal Zone Driver author: Paul Diefenbaugh alias: acpi*:LNXTHERM:* depends: thermal_sys,processor vermagic: 2.6.26-2-amd64 SMP mod_unload modversions parm: act:Disable or override all lowest active trip points. (int) parm: crt:Disable or lower all critical trip points. (int) parm: tzp:Thermal zone polling frequency, in 1/10 seconds. (int) parm: nocrt:Set to take no action upon ACPI thermal zone critical trips points. (int) parm: off:Set to disable ACPI thermal support. (int) parm: psv:Disable or override all passive trip points. (int) # The interface $ ls -l /sys/module/thermal/parameters/ total 0 -rw-r--r-- 1 root root 4096 2009-11-01 20:02 act -rw-r--r-- 1 root root 4096 2009-11-01 20:02 crt -rw-r--r-- 1 root root 4096 2009-11-01 20:02 psv -r--r--r-- 1 root root 4096 2009-11-01 20:02 tzp # Let's try reading current values, using a simple shortcut: $ grep . /sys/module/thermal/parameters/* /sys/module/thermal/parameters/act:0 /sys/module/thermal/parameters/crt:0 /sys/module/thermal/parameters/psv:0 /sys/module/thermal/parameters/tzp:0 As you can see, one parameter is strictly read-only. It can only be set at module load time. The other three variables are writble (for root). This immediately changes the value of that variable in kernel space. > Echoing new value(s) to > the /proc subtree has long been deprecated now, and the new /sys > interface seems largely to be read-only ... The procfs tree is also mostly read-only. BTW: /proc/sys is in no way deprecated. -- Tzafrir Cohen | tzaf...@jabber.org | VIM is http://tzafrir.org.il | | a Mutt's tzaf...@cohens.org.il | | best ICQ# 16849754 | | friend -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
