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Kernel memory debugging
Debugging features available since 2.6.31
Dynamic checker for access to uninitialized memory.
Only available on x86 so far, but will help to improve architecture independent code anyway.
See Documentation/kmemcheck.txt for details.
Dynamic checker for memory leaks
This feature is available for all architectures.
See Documentation/kmemleak.txt for details.
Both have a significant overhead. Only use them in development!