linux/mm/Kconfig.debug at master · fabgithub/linux · GitHub

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config DEBUG_PAGEALLOC

bool "Debug page memory allocations"

depends on DEBUG_KERNEL

depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC

depends on !KMEMCHECK

select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC

select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC

---help---

Unmap pages from the kernel linear mapping after free_pages().

This results in a large slowdown, but helps to find certain types

of memory corruption.

For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC,

fill the pages with poison patterns after free_pages() and verify

the patterns before alloc_pages(). Additionally,

this option cannot be enabled in combination with hibernation as

that would result in incorrect warnings of memory corruption after

a resume because free pages are not saved to the suspend image.

config WANT_PAGE_DEBUG_FLAGS

bool

config PAGE_POISONING

bool

select WANT_PAGE_DEBUG_FLAGS

config PAGE_GUARD

bool

select WANT_PAGE_DEBUG_FLAGS