generic debug pagealloc

[~andy/linux] / mm / Kconfig.debug

diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
new file mode 100644 (file)
index 0000000..c8d62d4
--- /dev/null
+++ b/mm/Kconfig.debug
@@ -0,0 +1,17 @@
+config WANT_PAGE_DEBUG_FLAGS
+       bool
+
+config PAGE_POISONING
+       bool "Debug page memory allocations"
+       depends on DEBUG_KERNEL && !ARCH_SUPPORTS_DEBUG_PAGEALLOC
+       depends on !HIBERNATION
+       select DEBUG_PAGEALLOC
+       select WANT_PAGE_DEBUG_FLAGS
+       help
+          Fill the pages with poison patterns after free_pages() and verify
+          the patterns before alloc_pages(). This results in a large slowdown,
+          but helps to find certain types of memory corruptions.
+
+          This option cannot enalbe with hibernation. Otherwise, it will get
+          wrong messages for memory corruption because the free pages are not
+          saved to the suspend image.