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         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 corruptions.
  10
  11 config WANT_PAGE_DEBUG_FLAGS
  12         bool
  13
  14 config 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 corruptions.
  24
  25            This option cannot enalbe with hibernation. Otherwise, it will get
  26            wrong messages for memory corruption because the free pages are not
  27            saved to the suspend image.