Commit | Line | Data |
---|---|---|
eefa864b JK |
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 | ||
ee3b4290 AM |
10 | config DEBUG_PAGEALLOC |
11 | bool "Debug page memory allocations" | |
7bc32f6f AM |
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 |
c0a32fc5 | 17 | select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC |
ee3b4290 AM |
18 | ---help--- |
19 | Unmap pages from the kernel linear mapping after free_pages(). | |
20 | This results in a large slowdown, but helps to find certain types | |
22f8b458 | 21 | of memory corruption. |
ee3b4290 | 22 | |
7bc32f6f AM |
23 | For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC, |
24 | fill the pages with poison patterns after free_pages() and verify | |
25 | the patterns before alloc_pages(). Additionally, | |
26 | this option cannot be enabled in combination with hibernation as | |
27 | that would result in incorrect warnings of memory corruption after | |
28 | a resume because free pages are not saved to the suspend image. | |
29 | ||
6a11f75b AM |
30 | config WANT_PAGE_DEBUG_FLAGS |
31 | bool | |
32 | ||
33 | config PAGE_POISONING | |
7bc32f6f | 34 | bool |
6a11f75b | 35 | select WANT_PAGE_DEBUG_FLAGS |
c0a32fc5 SG |
36 | |
37 | config PAGE_GUARD | |
38 | bool | |
39 | select WANT_PAGE_DEBUG_FLAGS |