On Thursday 31 August 2006 12:07, Akinobu Mita wrote:
> This patch provides fault-injection capability for alloc_pages()
>
> boot option:
>
> fail_page_alloc=<probability>,<interval>,<times>,<space>
>
> <probability>
>
> specifies how often it should fail in percent.
>
> <interval>
>
> specifies the interval of failures.
>
> <times>
>
> specifies how many times failures may happen at most.
>
> <space>
>
> specifies the size of free space where memory can be allocated
> safely in pages.
>
> Example:
>
> fail_page_alloc=100,10,-1,0
>
> page allocation fails once per 10 times.
I still think this will need some better filters to be useful. At least
a optional uid filter perhaps (make sure to handle the interrupt case
correctly, interrupts don't belong to the uid) , and perhaps an option to only
fail GFP_ATOMIC.
With arbitary failing the system will just be unusable, right? Or would
you run some system you use this way? @)
Another possibility would be to look up __builtin_return_address(0) in
the module table and allow failing only for a specific module.
-andi
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