On Thu, 18 Oct 2007 15:45:08 +0900 Takenori Nagano <t-nagano at ah.jp.nec.com> wrote: > Hi, > > A big thanks to everybody who read and replied to first version. I have tried to > incorporate reviewer's comments and suggestions. > > changelog take1 -> take2 > > - Rebased 2.6.23 > - comment updated > - renamed the notifiner name "tunable_notifier" to "tunable_atomic_notifier" > - fixed typo > > > These patches add new notifier function and implement it to panic_notifier_list. > We used the hardcoded notifier chain so far, but it was not flexible. New > notifier is very flexible, because user can change a list of order by debugfs. > > Thanks, > > Example) > > # cd /sys/kernel/debug/ > # ls > kprobes pktcdvd > # insmod ipmi_msghandler.ko > # ls > kprobes panic_notifier_list pktcdvd > # cd panic_notifier_list/ > # ls > ipmi_msghandler > # insmod ipmi_watchdog.ko > # ls > ipmi_msghandler ipmi_wdog > # cat ipmi_msghandler/priority > 200 > # cat ipmi_wdog/priority > 150 > # > Kernel panic - not syncing: panic > ipmi_msghandler : notifier calls panic_event(). > ipmi_watchdog : notifier calls wdog_panic_handler(). > > .....(reboot) > > # cat ipmi_msghandler/priority > 200 > # cat ipmi_wdog/priority > 150 > # echo 300 > ipmi_wdog/priority > # > Kernel panic - not syncing: panic > ipmi_watchdog : notifier calls wdog_panic_handler(). > ipmi_msghandler : notifier calls panic_event(). I can sort-of see what this is doing. Runtime-definable management of which notifier functions will be called on a panic? Or maybe I misunderstood. But even if I did understand, I don't understand why Linux needs this feature - what are the use cases, what is the value to our users? Can you please flesh that information out a bit more? The patches are somewhat wordwrapped - please check your email client configuration, thanks.
