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Commit | Line | Data |
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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 | select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC | |
8 | ---help--- | |
9 | Unmap pages from the kernel linear mapping after free_pages(). | |
10 | This results in a large slowdown, but helps to find certain types | |
11 | of memory corruption. | |
12 | ||
13 | For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC, | |
14 | fill the pages with poison patterns after free_pages() and verify | |
15 | the patterns before alloc_pages(). Additionally, | |
16 | this option cannot be enabled in combination with hibernation as | |
17 | that would result in incorrect warnings of memory corruption after | |
18 | a resume because free pages are not saved to the suspend image. | |
19 | ||
20 | config WANT_PAGE_DEBUG_FLAGS | |
21 | bool | |
22 | ||
23 | config PAGE_POISONING | |
24 | bool | |
25 | select WANT_PAGE_DEBUG_FLAGS | |
26 | ||
27 | config PAGE_GUARD | |
28 | bool | |
29 | select WANT_PAGE_DEBUG_FLAGS |