Messages in this thread | | | Date | Sat, 25 Feb 2006 14:27:20 +0100 | From | "Jesper Juhl" <> | Subject | Re: New reliability technique |
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On 2/25/06, Jesper Juhl <jesper.juhl@gmail.com> wrote: > On 2/25/06, Victor Porton <porton@ex-code.com> wrote: > > A minute ago I invented a new reliability enhancing technique. > > > > In idle cycles (or periodically in expense of some performance) Linux can > > calculate MD5 or CRC sums of _unused_ (free) memory areas and compare these > > sums with previously calculated sums. > > > > Additionally it can be done for allocated memory, if it will be write > > protected before the first actual write. Moreover, all memory may be made > > write-protected if it is not written e.g. more than a second. (When it > > is written kernel would unlock it and allow to write, by a techniqie like > > to how swap works.) If write-protected memory appears to be modified by > > a check sum, this likewise indicates a bug. > > > > If a sum is inequal, it would notice a bug in kernel or in hardware. > > > > I suggest to add "Check free memory control sums" in config. > > > > Implement it then and send a patch. >
But, doesn't slab poisoning and the like already cover this ground somewhat?
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