Re: [PATCH] x86_64: early memtest to find bad ram

[Jan Engelhardt]

On Mar 21 2008 13:03, Ingo Molnar wrote:
> * Yinghai Lu <yhlu.kernel.send@xxxxxxxxx> wrote:
>
> > do simple memtest after init_memory_mapping
> > use find_e820_area_size to find all ram range that is not reserved.
> > and do some simple bits test to find some bad ram.
> > if find some bad ram, use reserve_early to exclude that range.
>
> very nice patch! I always thought that this was the proper way to do
> memtest - and we could in fact also do something like this after SMP
> bringup, and hit the memory bus via multiple CPUs. [that will need a
> different enumeration though than e820 maps]

Perhaps this can even be used to provide on-the-fly badram
patch semantics?
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