Messages in this thread | | | Date | Wed, 23 Apr 2008 20:11:19 +0900 | From | Takenori Nagano <> | Subject | [PATCH 0/3] add new notifier function ,take4 |
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Hi,
changelog take3 -> take4
- Rebased 2.6.25-mm1 - Add a document - Add kdump on panic_notifier
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 control files.
And, third patch moves crash_kexec() to panic_notifier. It helps us to do something before taking a crash dump. It's useful for some RAS tools developer. If you want to use it, you have to set config option DUMP_ON_PANIC_NOTIFIER to Y. Default value of DUMP_ON_PANIC_NOTIFIER is N. If you set DUMP_ON_PANIC_NOTIFIER to N, kdump has no difference before.
------ Example)
# cd /sys/kernel/notifiers/ # ls panic_notifier_list # cd panic_notifier_list/ # ls ipmi_msghandler ipmi_wdog # insmod notifier_test.ko # ls ipmi_msghandler ipmi_wdog notifier_test1 notifier_test2 # cat */priority 200 150 500 1000 Kernel panic - not syncing: Panic by panic_module. __tunable_atomic_notifier_call_chain enter notifier_test: notifier_test_panic2() is called. notifier_test: notifier_test_panic() is called. msg_handler:panic_event was called. ipmi_wdog:wdog_panic_handler was called.
.....(reboot)
# cd /sys/kernel/notifiers/panic_notifier_list/ # ls ipmi_msghandler ipmi_wdog notifier_test1 notifier_test2 # cat */priority 200 150 500 1000 # echo 10000 > ipmi_msghandler/priority # echo 5000 > ipmi_wdog/priority # echo 3000 > notifier_test1/priority # echo 1500 > notifier_test2/priority # cat */priority 10000 5000 3000 1500 Kernel panic - not syncing: Panic by panic_module. __tunable_atomic_notifier_call_chain enter msg_handler:panic_event was called. ipmi_wdog:wdog_panic_handler was called. notifier_test: notifier_test_panic() is called. notifier_test: notifier_test_panic2() is called.
-- Takenori Nagano <t-nagano@ah.jp.nec.com>
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