blob: 957d3da53dddcd53b72da82e39f77d951db57a66 [file] [log] [blame]
Joonsoo Kimeefa864b2014-12-12 16:55:46 -08001config 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
Akinobu Mitaee3b4292009-04-02 16:56:30 -070010config DEBUG_PAGEALLOC
11 bool "Debug page memory allocations"
Akinobu Mita7bc32f62011-03-22 16:32:46 -070012 depends on DEBUG_KERNEL
13 depends on !HIBERNATION || ARCH_SUPPORTS_DEBUG_PAGEALLOC && !PPC && !SPARC
Vegard Nossum7d46d9e2008-04-04 00:51:41 +020014 depends on !KMEMCHECK
Joonsoo Kime30825f2014-12-12 16:55:49 -080015 select PAGE_EXTENSION
Akinobu Mita7bc32f62011-03-22 16:32:46 -070016 select PAGE_POISONING if !ARCH_SUPPORTS_DEBUG_PAGEALLOC
Akinobu Mitaee3b4292009-04-02 16:56:30 -070017 ---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
Frans Pop22f8b452009-07-24 05:31:17 +020020 of memory corruption.
Akinobu Mitaee3b4292009-04-02 16:56:30 -070021
Akinobu Mita7bc32f62011-03-22 16:32:46 -070022 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
Akinobu Mita6a11f752009-03-31 15:23:17 -070029config PAGE_POISONING
Akinobu Mita7bc32f62011-03-22 16:32:46 -070030 bool