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1config 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
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10config DEBUG_PAGEALLOC
11 bool "Debug page memory allocations"
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12 depends on DEBUG_KERNEL
13 depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
7d46d9e6 14 depends on !KMEMCHECK
e30825f1 15 select PAGE_EXTENSION
7bc32f6f 16 select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
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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
22f8b458 20 of memory corruption.
ee3b4290 21
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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
6a11f75b 29config PAGE_POISONING
7bc32f6f 30 bool