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Diffstat (limited to 'Documentation/fault-injection/notifier-error-inject.txt')
| -rw-r--r-- | Documentation/fault-injection/notifier-error-inject.txt | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/Documentation/fault-injection/notifier-error-inject.txt b/Documentation/fault-injection/notifier-error-inject.txt deleted file mode 100644 index e861d761de24..000000000000 --- a/Documentation/fault-injection/notifier-error-inject.txt +++ /dev/null @@ -1,94 +0,0 @@ -Notifier error injection -======================== - -Notifier error injection provides the ability to inject artificial errors to -specified notifier chain callbacks. It is useful to test the error handling of -notifier call chain failures which is rarely executed. There are kernel -modules that can be used to test the following notifiers. - - * PM notifier - * Memory hotplug notifier - * powerpc pSeries reconfig notifier - * Netdevice notifier - -PM notifier error injection module ----------------------------------- -This feature is controlled through debugfs interface -/sys/kernel/debug/notifier-error-inject/pm/actions/<notifier event>/error - -Possible PM notifier events to be failed are: - - * PM_HIBERNATION_PREPARE - * PM_SUSPEND_PREPARE - * PM_RESTORE_PREPARE - -Example: Inject PM suspend error (-12 = -ENOMEM) - - # cd /sys/kernel/debug/notifier-error-inject/pm/ - # echo -12 > actions/PM_SUSPEND_PREPARE/error - # echo mem > /sys/power/state - bash: echo: write error: Cannot allocate memory - -Memory hotplug notifier error injection module ----------------------------------------------- -This feature is controlled through debugfs interface -/sys/kernel/debug/notifier-error-inject/memory/actions/<notifier event>/error - -Possible memory notifier events to be failed are: - - * MEM_GOING_ONLINE - * MEM_GOING_OFFLINE - -Example: Inject memory hotplug offline error (-12 == -ENOMEM) - - # cd /sys/kernel/debug/notifier-error-inject/memory - # echo -12 > actions/MEM_GOING_OFFLINE/error - # echo offline > /sys/devices/system/memory/memoryXXX/state - bash: echo: write error: Cannot allocate memory - -powerpc pSeries reconfig notifier error injection module --------------------------------------------------------- -This feature is controlled through debugfs interface -/sys/kernel/debug/notifier-error-inject/pSeries-reconfig/actions/<notifier event>/error - -Possible pSeries reconfig notifier events to be failed are: - - * PSERIES_RECONFIG_ADD - * PSERIES_RECONFIG_REMOVE - * PSERIES_DRCONF_MEM_ADD - * PSERIES_DRCONF_MEM_REMOVE - -Netdevice notifier error injection module ----------------------------------------------- -This feature is controlled through debugfs interface -/sys/kernel/debug/notifier-error-inject/netdev/actions/<notifier event>/error - -Netdevice notifier events which can be failed are: - - * NETDEV_REGISTER - * NETDEV_CHANGEMTU - * NETDEV_CHANGENAME - * NETDEV_PRE_UP - * NETDEV_PRE_TYPE_CHANGE - * NETDEV_POST_INIT - * NETDEV_PRECHANGEMTU - * NETDEV_PRECHANGEUPPER - * NETDEV_CHANGEUPPER - -Example: Inject netdevice mtu change error (-22 == -EINVAL) - - # cd /sys/kernel/debug/notifier-error-inject/netdev - # echo -22 > actions/NETDEV_CHANGEMTU/error - # ip link set eth0 mtu 1024 - RTNETLINK answers: Invalid argument - -For more usage examples ------------------------ -There are tools/testing/selftests using the notifier error injection features -for CPU and memory notifiers. - - * tools/testing/selftests/cpu-hotplug/on-off-test.sh - * tools/testing/selftests/memory-hotplug/on-off-test.sh - -These scripts first do simple online and offline tests and then do fault -injection tests if notifier error injection module is available. |