Re: [Qemu-devel] [PATCH v4 06/14] qemu-thread: add simple test-and-set spinlock

[Richard Henderson]

On 04/29/2016 05:33 PM, Emilio G. Cota wrote:
> From: Guillaume Delbergue <address@hidden>
>
> Signed-off-by: Guillaume Delbergue <address@hidden>
> [Rewritten. - Paolo]
> Signed-off-by: Paolo Bonzini <address@hidden>
> [Emilio's additions: use atomic_test_and_set instead of atomic_xchg;
>  call cpu_relax() while spinning; optimize for uncontended locks by
>  acquiring the lock with TAS instead of TATAS.]
> Signed-off-by: Emilio G. Cota <address@hidden>
> ---
>  include/qemu/thread.h | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)


Reviewed-by: Richard Henderson <address@hidden>


r~