Root/mm/Kconfig.debug

1config DEBUG_PAGEALLOC
2    bool "Debug page memory allocations"
3    depends on DEBUG_KERNEL
4    depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
5    depends on !KMEMCHECK
6    select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
7    ---help---
8      Unmap pages from the kernel linear mapping after free_pages().
9      This results in a large slowdown, but helps to find certain types
10      of memory corruption.
11
12      For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC,
13      fill the pages with poison patterns after free_pages() and verify
14      the patterns before alloc_pages(). Additionally,
15      this option cannot be enabled in combination with hibernation as
16      that would result in incorrect warnings of memory corruption after
17      a resume because free pages are not saved to the suspend image.
18
19config WANT_PAGE_DEBUG_FLAGS
20    bool
21
22config PAGE_POISONING
23    bool
24    select WANT_PAGE_DEBUG_FLAGS
25

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