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        depends on !KMEMCHECK
   6        ---help---
   7          Unmap pages from the kernel linear mapping after free_pages().
   8          This results in a large slowdown, but helps to find certain types
   9          of memory corruption.
  10
  11config WANT_PAGE_DEBUG_FLAGS
  12        bool
  13
  14config PAGE_POISONING
  15        bool "Debug page memory allocations"
  16        depends on DEBUG_KERNEL && !ARCH_SUPPORTS_DEBUG_PAGEALLOC
  17        depends on !HIBERNATION
  18        select DEBUG_PAGEALLOC
  19        select WANT_PAGE_DEBUG_FLAGS
  20        ---help---
  21           Fill the pages with poison patterns after free_pages() and verify
  22           the patterns before alloc_pages(). This results in a large slowdown,
  23           but helps to find certain types of memory corruption.
  24
  25           This option cannot be enabled in combination with hibernation as
  26           that would result in incorrect warnings of memory corruption after
  27           a resume because free pages are not saved to the suspend image.
  28