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Linux/mm/Kconfig.debug

  1 config PAGE_EXTENSION
  2         bool "Extend memmap on extra space for more information on page"
  3         ---help---
  4           Extend memmap on extra space for more information on page. This
  5           could be used for debugging features that need to insert extra
  6           field for every page. This extension enables us to save memory
  7           by not allocating this extra memory according to boottime
  8           configuration.
  9 
 10 config DEBUG_PAGEALLOC
 11         bool "Debug page memory allocations"
 12         depends on DEBUG_KERNEL
 13         depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
 14         depends on !KMEMCHECK
 15         select PAGE_EXTENSION
 16         select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
 17         ---help---
 18           Unmap pages from the kernel linear mapping after free_pages().
 19           This results in a large slowdown, but helps to find certain types
 20           of memory corruption.
 21 
 22           For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC,
 23           fill the pages with poison patterns after free_pages() and verify
 24           the patterns before alloc_pages().  Additionally,
 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 
 29 config PAGE_POISONING
 30         bool

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