2 bool "Extend memmap on extra space for more information on page"
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
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
16 select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
17 select PAGE_GUARD if ARCH_SUPPORTS_DEBUG_PAGEALLOC
19 Unmap pages from the kernel linear mapping after free_pages().
20 This results in a large slowdown, but helps to find certain types
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.
30 config WANT_PAGE_DEBUG_FLAGS
35 select WANT_PAGE_DEBUG_FLAGS
39 select WANT_PAGE_DEBUG_FLAGS