Re: [RFC 00/15] x86_64: Optimize percpu accesses

[Mike Travis]

H. Peter Anvin wrote:
> Mike Travis wrote:
>>
>> Hmm, that might be the way to go.... At boot up time determine the
>> size of the system in terms of cpu count and memory available and
>> attempt to do the right thing, with startup options to override the
>> internal choices... ?
>>
>> (Surely a system that has a "gazillion ip tunnels" could modify it's
>> kernel start options... ;-)
>>
>> Unfortunately, we can't use a MODULE to support different options unless
>> we change how the kernel starts up (would need to mount the root fs
>> before starting secondary cpus.)
>>
> 
> Using a module doesn't make any sense anyway.  This is more what the
> kernel command line is for.
> 
>     -hpa


I was thinking that supporting virtual percpu addresses would take a fair
amount of code that, if living in a MODULE, wouldn't impact small systems.
But it seems to be not worth the effort... ;-)

Thanks,
Mike
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/