[openEuler 20.03] introduce sysctl to print all traces when a hung task is detected

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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.

GVP openEuler / kernel

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GVPopenEuler / kernel

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[openEuler 20.03] introduce sysctl to print all traces when a hung task is detected

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GVP openEuler / kernel