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| author | Akinobu Mita <akinobu.mita@gmail.com> | 2009-03-31 15:23:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-01 08:59:13 -0700 |
| commit | 6a11f75b6a17b5d9ac5025f8d048382fd1f47377 (patch) | |
| tree | a3415cd897823975b927f89a233d2703bf97ba2b /mm/Kconfig.debug | |
| parent | 610a77e04a8d9fe8764dc484e2182fa251ce1cc2 (diff) | |
| download | lwn-6a11f75b6a17b5d9ac5025f8d048382fd1f47377.tar.gz lwn-6a11f75b6a17b5d9ac5025f8d048382fd1f47377.zip | |
generic debug pagealloc
CONFIG_DEBUG_PAGEALLOC is now supported by x86, powerpc, sparc64, and
s390. This patch implements it for the rest of the architectures by
filling the pages with poison byte patterns after free_pages() and
verifying the poison patterns before alloc_pages().
This generic one cannot detect invalid page accesses immediately but
invalid read access may cause invalid dereference by poisoned memory and
invalid write access can be detected after a long delay.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/Kconfig.debug')
| -rw-r--r-- | mm/Kconfig.debug | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug new file mode 100644 index 000000000000..c8d62d49a44e --- /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. |