Monitoring Kernel Threads; Configuring Kernel Thread Deadloop Detection - HP 5920 Configuration Manual

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Task
Display heap memory usage for a
user process.
Display the addresses of memory
blocks with a specified size used
by a user process.
Display memory content starting
from a specified memory block for
a user process.
Display context information for
process exceptions.
Display the core file directory.
Enable or disable a process to
generate core files for exceptions
and set the maximum number of
core files (which defaults to 1).
Specify the directory for saving
core files (the default directory is
flash:/ on the master device).
Clear context information for
process exceptions.

Monitoring kernel threads

Tasks in this section help you quickly identify thread deadloop and starvation problems and their causes.

Configuring kernel thread deadloop detection

CAUTION:
Inappropriate configuration of kernel thread deadloop detection can cause service problems or system
breakdown. Make sure you understand the impact of this configuration on your network before you do it.
Kernel threads share resources. If a kernel thread monopolizes the CPU, other threads cannot run,
resulting in a deadloop.
This feature enables the device to detect deadloops. If a thread occupies the CPU for a specific interval,
the device considers that a deadloop has occurred. It generates a deadloop message and reboots to
remove the deadloop.
To configure kernel thread deadloop detection:
Step
1.
Enter system view.
2.
Enable kernel thread
deadloop detection.
Command
display process memory heap job job-id [ verbose ] [ slot slot-number ]
display process memory heap job job-id size memory-size [ offset
offset-size ] [ slot slot-number ]
display process memory heap job job-id address starting-address length
memory-length [ slot slot-number ]
display exception context [ count value ] [ slot slot-number ]
display exception filepath [ slot slot-number ]
process core { maxcore value | off } { job job-id | name process-name }
[ slot slot-number ]
exception filepath directory
reset exception context [ slot slot-number ]
Command
system-view
monitor kernel deadloop enable [ slot
slot-number ]
206
Remarks
N/A
By default, this function is
disabled.

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