kmem_stackinfo
Variable
- Description
-
If the
kmem_stackinfo
variable is enabled in an/etc/system.d/file
at kernel thread creation time, the kernel thread stack is filled with a specific pattern instead of filled with zeros. During kernel thread execution, this kernel thread stack pattern is progressively overwritten. A simple count from the stack top until the pattern is not found gives a high watermark value, which is the maximum kernel stack space used by a kernel thread. This mechanism allows the following features:-
Compute the percentage of kernel thread stack really used (a high watermark) for current kernel threads in the system
-
When a kernel thread ends, the system logs the last kernel threads that have used the most of their kernel thread stacks before dying to a small circular memory buffer
-
- Data Type
-
Unsigned integer
- Default
-
0 (disabled)
- Range
-
0 (disabled) or 1 (enabled)
- Dynamic?
-
Yes
- Validation
-
None
- When to Change
-
When you want to monitor kernel thread stack usage. Keep in mind that when
kmem_stackinfo
is enabled, the performance of creating and deleting kthreads is decreased. See Oracle Solaris Modular Debugger Guide. - Zone Configuration
-
This parameter must be set in the global zone.
- Commitment Level
-
Unstable