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

[Mike Travis]

H. Peter Anvin wrote:
> Mike Travis wrote:
>> Eric W. Biederman wrote:
>> ...
>>> Another alternative that almost fares better then a segment with
>>> a base of zero is a base of -32K or so.  Only trouble that would get us
>>> manually managing the per cpu area size again.
>>
>> One thing to remember is the eventual goal is implementing the cpu_alloc
>> functions which I think we've agreed has to be "growable".  This means
>> that
>> the addresses will need to be virtual to allow the same offsets for
>> all cpus.
>> The patchset I have uses 2Mb pages.  This "little" twist might figure
>> into the
>> implementation issues that are being discussed.
>>
> 
> No, since the *addresses* can be arbitrary.  The current issue is about
> *offsets.*
> 
>     -hpa

Ok, thanks for clearing that up.  I just didn't want us to drop the ball
trying to make that double play... ;-)

Cheers,
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/