svn commit: r210564 - in head/sys: amd64/conf conf i386/conf ia64/conf kern pc98/conf powerpc/conf sparc64/conf sun4v/conf sys

[Nathan Whitehorn]

On 07/28/10 17:36, Matthew D Fleming wrote:
> Author: mdf
> Date: Wed Jul 28 15:36:12 2010
> New Revision: 210564
> URL: http://svn.freebsd.org/changeset/base/210564
>
> Log:
>    Add MALLOC_DEBUG_MAXZONES debug malloc(9) option to use multiple uma
>    zones for each malloc bucket size.  The purpose is to isolate
>    different malloc types into hash classes, so that any buffer overruns
>    or use-after-free will usually only affect memory from malloc types in
>    that hash class.  This is purely a debugging tool; by varying the hash
>    function and tracking which hash class was corrupted, the intersection
>    of the hash classes from each instance will point to a single malloc
>    type that is being misused.  At this point inspection or memguard(9)
>    can be used to catch the offending code.
>
>    Add MALLOC_DEBUG_MAXZONES=8 to -current GENERIC configuration files.
>    The suggestion to have this on by default came from Kostik Belousov on
>    -arch.
>
>    This code is based on work by Ron Steinke at Isilon Systems.
>
>    Reviewed by:    -arch (mostly silence)
>    Reviewed by:    zml
>    Approved by:    zml (mentor)
>
>    

Could you also add this change to the powerpc64 GENERIC? It lives at 
sys/powerpc/conf/GENERIC64.
-Nathan