IBM AIX Continuous Availability Features - IBM Redbooks

3.9.7 Heap registration for individual debug control
Kernel programmers can register the heap they created using heap_create() under the
alloc.xmdbg component by using the following command:
errctrl -c alloc.xmdbg skhp_reg=
Where is the address of heap and needs to be found from KDB. In Example 3-49 on
page 136, my_heap is an individual heap and is valid for registration under alloc.xmdbg. To find
its address in kernel space, execute dd my_heap in KDB.
After heap is registered under alloc.xmdbg, it should be visible under its component
hierarchy. Execute following command to see it:
errctrl -q -c alloc.xmdbg -r
The new child component represents the heap “my_heap” and can be controlled individually
by using pass-through commands. For further information about this topic, refer to 3.9.4,
“XMDBG tunables affected by error check level” on page 131, and to3.9.5, “XMDBG tunables
not affected by error check level” on page 134.
Note that persistence (the –P flag of the errctrl command) is not supported with this
mechanism because this new subcomponent will not exist at the next system boot.
Chapter 3. AIX advanced continuous availability tools and features 137