Re: [Qemu-devel] env in TLS

["Rafael Espíndola" <rafael.espindola@gmail.com>]

I have done some experiments in using TLS instead of LDT in the case
of  the code-copying optimization:

http://lists.gnu.org/archive/html/qemu-devel/2004-09/msg00206.html
http://lists.gnu.org/archive/html/qemu-devel/2004-09/msg00248.html

Hope that it is useful.

Rafael

On Mon, 11 Oct 2004 01:32:28 -0700 (PDT), Piotr Krysik
<piotrek_priv@yahoo.com> wrote:
> Hi!
> 
> Fabrice, how about moving env variable to TLS?
> 
> This could improve performance (based on
> http://lists.gnu.org/archive/html/qemu-devel/2004-09/msg00294.html
> 
> about 10% could be gained -- need to verify). Also
> additional register would be available for op.c
> (anyone to implement register renaming?).
> 
> The main problem with this approach is portability.
> AFAIK GCC <= 3.2 doesn't recognize __thread keyword.
> For x86 we could fall-back to the LDT method from
> qemu-fast. How about other platforms? In the worst
> case we could use global variable and forget about
> multi-processor qemu-softmmu and multi-thread in
> qemu-user for some platforms in the future.
> 
> Comments?
> 
> Piotrek
> 
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