Re: [Qemu-devel] [PATCH v2 0/6] Reduce lock contention on TCG hot-path

[Emilio G. Cota]

On Tue, Jul 05, 2016 at 17:18:10 +0100, Alex Bennée wrote:
> Well this is the first re-spin of the series posted last week. I've
> added a bunch of additional patches to be more aggressive with
> avoiding bouncing locks but to be honest the numbers don't seem to
> make it worth it.

How many threads are you using? With just a few threads I wouldn't
expect a measurable difference.

> I think the first 3 patches are ready to take if the TCG maintainers
> want to:
> 
>     tcg: Ensure safe tb_jmp_cache lookup out of 'tb_lock'
>     tcg: set up tb->page_addr before insertion
>     tcg: cpu-exec: remove tb_lock from the hot-path

I think it would be simpler to use tb_lock_recursive and
tb_lock_reset, as pointed out in v1 of this series.

Thanks,

                Emilio