| config PAGE_EXTENSION | |
| bool "Extend memmap on extra space for more information on page" | |
| ---help--- | |
| Extend memmap on extra space for more information on page. This | |
| could be used for debugging features that need to insert extra | |
| field for every page. This extension enables us to save memory | |
| by not allocating this extra memory according to boottime | |
| configuration. | |
| config DEBUG_PAGEALLOC | |
| bool "Debug page memory allocations" | |
| depends on DEBUG_KERNEL | |
| depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC | |
| depends on !KMEMCHECK | |
| select PAGE_EXTENSION | |
| select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC | |
| ---help--- | |
| Unmap pages from the kernel linear mapping after free_pages(). | |
| This results in a large slowdown, but helps to find certain types | |
| of memory corruption. | |
| For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC, | |
| fill the pages with poison patterns after free_pages() and verify | |
| the patterns before alloc_pages(). Additionally, | |
| this option cannot be enabled in combination with hibernation as | |
| that would result in incorrect warnings of memory corruption after | |
| a resume because free pages are not saved to the suspend image. | |
| config PAGE_POISONING | |
| bool |