Re: [PATCH 3/4] Swapping

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Avi Kivity wrote:
>>>> I wonder if there's a more elegant way dealing with older 
>>>> userspaces.  For instance, is there any reason why we can allocate a 
>>>> userspace memory region on behalf of userspace.  That way swap would 
>>>> even work with older userspaces.
>>>>       
>>>>         
>>> if we can do that, yes swap will work on older userspace.
>>>     
>>>       
>> I think it's just a matter of calling do_mmap() with the appropriate 
>> parameters.  It looks likes there's some drivers call do_mmap() directly.
>>
>>   
>>     
>
> This will halve the maximum size of virtual machines on i386 since
> userspace will also mmap() the memory, and the virtual address space is
> restricted to 3GB.
>
>   

Upon further reflection, considering that this will only be generally
available in a kernel in six months (2.6.25) and that new userspace has
already been released, and that only i386 is affected, the
simplification may be worthwhile.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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