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    select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC
8    ---help---
9      Unmap pages from the kernel linear mapping after free_pages().
10      This results in a large slowdown, but helps to find certain types
11      of memory corruption.
12
13      For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC,
14      fill the pages with poison patterns after free_pages() and verify
15      the patterns before alloc_pages(). Additionally,
16      this option cannot be enabled in combination with hibernation as
17      that would result in incorrect warnings of memory corruption after
18      a resume because free pages are not saved to the suspend image.
19
20config WANT_PAGE_DEBUG_FLAGS
21    bool
22
23config PAGE_POISONING
24    bool
25    select WANT_PAGE_DEBUG_FLAGS
26
27config PAGE_GUARD
28    bool
29    select WANT_PAGE_DEBUG_FLAGS
30

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