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usr
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lib
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3.10.0-1062.9.1.el7.x86_64
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build
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mm
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Filename :
Kconfig.debug
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config PAGE_EXTENSION bool "Extend memmap on extra space for more information on page" select MEMCG ---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(). Depending on runtime enablement, this results in a small or 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. By default this option will have a small overhead, e.g. by not allowing the kernel mapping to be backed by large pages on some architectures. Even bigger overhead comes when the debugging is enabled by DEBUG_PAGEALLOC_ENABLE_DEFAULT or the debug_pagealloc command line parameter. config WANT_PAGE_DEBUG_FLAGS bool config DEBUG_PAGEALLOC_ENABLE_DEFAULT bool "Enable debug page memory allocations by default?" default n depends on DEBUG_PAGEALLOC ---help--- Enable debug page memory allocations by default? This value can be overridden by debug_pagealloc=off|on. config PAGE_POISONING bool select WANT_PAGE_DEBUG_FLAGS config PAGE_GUARD bool select WANT_PAGE_DEBUG_FLAGS