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4 Kmemleak provides a way of detecting possible kernel memory leaks in a
5 way similar to a `tracing garbage collector
8 reported via /sys/kernel/debug/kmemleak. A similar method is used by the
15 CONFIG_DEBUG_KMEMLEAK in "Kernel hacking" has to be enabled. A kernel
58     trigger a memory scan
86 information like size and stack trace, are stored in a rbtree.
94 block to a freeing function and therefore the block is considered a
103      a pointer to a white object is found, the object is added to the
115 block is not considered a leak. One example is __vmalloc().
124 /sys/kernel/debug/kmemleak output. By issuing a 'scan' after a 'clear'
128 To test a critical section on demand with a clean kmemleak do::
144 a large part of physical memory.
156 - ``kmemleak_alloc``		 - notify of a memory block allocation
157 - ``kmemleak_alloc_percpu``	 - notify of a percpu memory block allocation
158 - ``kmemleak_vmalloc``		 - notify of a vmalloc() memory allocation
159 - ``kmemleak_free``		 - notify of a memory block freeing
160 - ``kmemleak_free_part``	 - notify of a partial memory block freeing
161 - ``kmemleak_free_percpu``	 - notify of a percpu memory block freeing
163 - ``kmemleak_not_leak``	 - mark an object as not a leak
165 - ``kmemleak_scan_area``	 - add scan areas inside a memory block
166 - ``kmemleak_no_scan``	 - do not scan a memory block
167 - ``kmemleak_erase``		 - erase an old value in a pointer variable
171 The following functions take a physical address as the object pointer
172 and only perform the corresponding action if the address has a lowmem
198 the minimum age of an object to be reported as a memory leak.
210 address inside a block's address range. This may lead to an increased
211 number of false negatives. However, it is likely that a real memory leak
215 values. In a future version, kmemleak could only scan the pointer
222 macro or the pointer is stored in a location not scanned by kmemleak.
230 module, a module that deliberately leaks memory. Set CONFIG_SAMPLE_KMEMLEAK
232 enabled. Load the module and perform a scan with::
245             6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b  kkkkkkkkkkkkkkkk
246             6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5  kkkkkkkkkkkkkkk.