1config 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 corruption. 10 11config WANT_PAGE_DEBUG_FLAGS 12 bool 13 14config 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 corruption. 24 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