LXR linux/mm/Kconfig.debug

   1config DEBUG_PAGEALLOC
   2        bool "Debug page memory allocations"
   3        depends on DEBUG_KERNEL && ARCH_SUPPORTS_DEBUG_PAGEALLOC
   4        depends on !HIBERNATION || !PPC && !SPARC
   5        ---help---
   6          Unmap pages from the kernel linear mapping after free_pages().
   7          This results in a large slowdown, but helps to find certain types
   8          of memory corruptions.
   9
  10config WANT_PAGE_DEBUG_FLAGS
  11        bool
  12
  13config PAGE_POISONING
  14        bool "Debug page memory allocations"
  15        depends on DEBUG_KERNEL && !ARCH_SUPPORTS_DEBUG_PAGEALLOC
  16        depends on !HIBERNATION
  17        select DEBUG_PAGEALLOC
  18        select WANT_PAGE_DEBUG_FLAGS
  19        help
  20           Fill the pages with poison patterns after free_pages() and verify
  21           the patterns before alloc_pages(). This results in a large slowdown,
  22           but helps to find certain types of memory corruptions.
  23
  24           This option cannot enalbe with hibernation. Otherwise, it will get
  25           wrong messages for memory corruption because the free pages are not
  26           saved to the suspend image.
  27