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Commit | Line | Data |
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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 |