mm/Kconfig.debug

   1 config 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
  20 config WANT_PAGE_DEBUG_FLAGS
  21         bool
  22
  23 config PAGE_POISONING
  24         bool
  25         select WANT_PAGE_DEBUG_FLAGS
  26
  27 config PAGE_GUARD
  28         bool
  29         select WANT_PAGE_DEBUG_FLAGS