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Diffstat (limited to 'Documentation/admin-guide/sysctl/kernel.rst')
| -rw-r--r-- | Documentation/admin-guide/sysctl/kernel.rst | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 1ebf68d01141..83acf5025488 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -335,6 +335,20 @@ Path for the hotplug policy agent. Default value is "``/sbin/hotplug``". +hung_task_all_cpu_backtrace: +================ + +If this option is set, the kernel will send an NMI to all CPUs to dump +their backtraces when a hung task is detected. This file shows up if +CONFIG_DETECT_HUNG_TASK and CONFIG_SMP are enabled. + +0: Won't show all CPUs backtraces when a hung task is detected. +This is the default behavior. + +1: Will non-maskably interrupt all CPUs and dump their backtraces when +a hung task is detected. + + hung_task_panic =============== @@ -632,6 +646,22 @@ rate for each task. scanned for a given scan. +oops_all_cpu_backtrace: +================ + +If this option is set, the kernel will send an NMI to all CPUs to dump +their backtraces when an oops event occurs. It should be used as a last +resort in case a panic cannot be triggered (to protect VMs running, for +example) or kdump can't be collected. This file shows up if CONFIG_SMP +is enabled. + +0: Won't show all CPUs backtraces when an oops is detected. +This is the default behavior. + +1: Will non-maskably interrupt all CPUs and dump their backtraces when +an oops event is detected. + + osrelease, ostype & version =========================== @@ -1239,6 +1269,13 @@ ORed together. The letters are seen in "Tainted" line of Oops reports. See :doc:`/admin-guide/tainted-kernels` for more information. +Note: + writes to this sysctl interface will fail with ``EINVAL`` if the kernel is + booted with the command line option ``panic_on_taint=<bitmask>,nousertaint`` + and any of the ORed together values being written to ``tainted`` match with + the bitmask declared on panic_on_taint. + See :doc:`/admin-guide/kernel-parameters` for more details on that particular + kernel command line option and its optional ``nousertaint`` switch. threads-max =========== |