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2012-01-10mm: more intensive memory corruption debuggingStanislaw Gruszka
With CONFIG_DEBUG_PAGEALLOC configured, the CPU will generate an exception on access (read,write) to an unallocated page, which permits us to catch code which corrupts memory. However the kernel is trying to maximise memory usage, hence there are usually few free pages in the system and buggy code usually corrupts some crucial data. This patch changes the buddy allocator to keep more free/protected pages and to interlace free/protected and allocated pages to increase the probability of catching corruption. When the kernel is compiled with CONFIG_DEBUG_PAGEALLOC, debug_guardpage_minorder defines the minimum order used by the page allocator to grant a request. The requested size will be returned with the remaining pages used as guard pages. The default value of debug_guardpage_minorder is zero: no change from current behaviour. [akpm@linux-foundation.org: tweak documentation, s/flg/flag/] Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-03-22mm: debug-pagealloc: fix kconfig dependency warningAkinobu Mita
Fix kconfig dependency warning to satisfy dependencies: warning: (PAGE_POISONING) selects DEBUG_PAGEALLOC which has unmet direct dependencies (DEBUG_KERNEL && ARCH_SUPPORTS_DEBUG_PAGEALLOC && (!HIBERNATION || !PPC && !SPARC) && !KMEMCHECK) Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-21trivial: improve help text for mm debug config optionsFrans Pop
Improve the help text for PAGE_POISONING. Also fix some typos and improve consistency within the file. Signed-of-by: Frans Pop <elendil@planet.nl> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-15kmemcheck: enable in the x86 KconfigVegard Nossum
let it rip! Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu> [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>
2009-04-02generic debug pagealloc: build fixAkinobu Mita
This fixes a build failure with generic debug pagealloc: mm/debug-pagealloc.c: In function 'set_page_poison': mm/debug-pagealloc.c:8: error: 'struct page' has no member named 'debug_flags' mm/debug-pagealloc.c: In function 'clear_page_poison': mm/debug-pagealloc.c:13: error: 'struct page' has no member named 'debug_flags' mm/debug-pagealloc.c: In function 'page_poison': mm/debug-pagealloc.c:18: error: 'struct page' has no member named 'debug_flags' mm/debug-pagealloc.c: At top level: mm/debug-pagealloc.c:120: error: redefinition of 'kernel_map_pages' include/linux/mm.h:1278: error: previous definition of 'kernel_map_pages' was here mm/debug-pagealloc.c: In function 'kernel_map_pages': mm/debug-pagealloc.c:122: error: 'debug_pagealloc_enabled' undeclared (first use in this function) by fixing - debug_flags should be in struct page - define DEBUG_PAGEALLOC config option for all architectures Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Reported-by: Alexander Beregalov <a.beregalov@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-01generic debug pageallocAkinobu Mita
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>
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## What is Vim? ##

Vim is a greatly improved version of the good old UNIX editor Vi.  Many new
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This editor is very useful for editing programs and other plain text files.
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Vim runs under MS-Windows (NT, 2000, XP, Vista, 7, 8, 10), Macintosh, VMS and
almost all flavours of UNIX.  Porting to other systems should not be very
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## Distribution ##

You can often use your favorite package manager to install Vim.  On Mac and
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There are separate distributions for Unix, PC, Amiga and some other systems.
This `README.md` file comes with the runtime archive.  It includes the
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an overview of currently available distributions.

Some popular places to get the latest Vim:
* Check out the git repository from [github](https://github.com/vim/vim).
* Get the source code as an [archive](https://github.com/vim/vim/releases).
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## Compiling ##

If you obtained a binary distribution you don't need to compile Vim.  If you
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## Installation ##

See one of these files for system-specific instructions.  Either in the
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	README_ami.txt		Amiga
	README_unix.txt		Unix
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There are other `README_*.txt` files, depending on the distribution you used.


## Documentation ##

The Vim tutor is a one hour training course for beginners.  Often it can be
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## Copying ##

Vim is Charityware.  You can use and copy it as much as you like, but you are
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Summary of the license: There are no restrictions on using or distributing an
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## Sponsoring ##

Fixing bugs and adding new features takes a lot of time and effort.  To show
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Since Bram is back to a paid job the money will now be used to help children
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For the most recent information about sponsoring look on the Vim web site:
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## Contributing ##

If you would like to help making Vim better, see the [CONTRIBUTING.md](https://github.com/vim/vim/blob/master/CONTRIBUTING.md) file.


## Information ##

The latest news about Vim can be found on the Vim home page:
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If you have problems, have a look at the Vim documentation or tips:
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If you still have problems or any other questions, use one of the mailing
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## Main author ##

Send any other comments, patches, flowers and suggestions to:
	Bram Moolenaar <Bram@vim.org>


This is `README.md` for version 8.1 of Vim: Vi IMproved.