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         ---help---
   8           Unmap pages from the kernel linear mapping after free_pages().
   9           This results in a large slowdown, but helps to find certain types
  10           of memory corruption.
  11
  12           For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC,
  13           fill the pages with poison patterns after free_pages() and verify
  14           the patterns before alloc_pages().  Additionally,
  15           this option cannot be enabled in combination with hibernation as
  16           that would result in incorrect warnings of memory corruption after
  17           a resume because free pages are not saved to the suspend image.
  18
  19 config WANT_PAGE_DEBUG_FLAGS
  20         bool
  21
  22 config PAGE_POISONING
  23         bool
  24         select WANT_PAGE_DEBUG_FLAGS