mm/Kconfig.debug

   1 config 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
  10 config WANT_PAGE_DEBUG_FLAGS
  11         bool
  12
  13 config 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.