mirror of https://gitee.com/openkylin/linux.git
40 lines
1.4 KiB
Plaintext
40 lines
1.4 KiB
Plaintext
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
|
|
select PAGE_GUARD 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 WANT_PAGE_DEBUG_FLAGS
|
|
bool
|
|
|
|
config PAGE_POISONING
|
|
bool
|
|
select WANT_PAGE_DEBUG_FLAGS
|
|
|
|
config PAGE_GUARD
|
|
bool
|
|
select WANT_PAGE_DEBUG_FLAGS
|