Re: [Qemu-arm] [PATCH v9 21/25] target-arm: don't generate WFE/YIELD calls for MTTCG

[Peter Maydell]

On 1 February 2017 at 15:05, Alex Bennée <address@hidden> wrote:
> The WFE and YIELD instructions are really only hints and in TCG's case
> they were useful to move the scheduling on from one vCPU to the next. In
> the parallel context (MTTCG) this just causes an unnecessary cpu_exit
> and contention of the BQL.
>
> Signed-off-by: Alex Bennée <address@hidden>
> Reviewed-by: Richard Henderson <address@hidden>
> ---
>  target/arm/op_helper.c     |  7 +++++++
>  target/arm/translate-a64.c |  8 ++++++--
>  target/arm/translate.c     | 20 ++++++++++++++++----
>  3 files changed, 29 insertions(+), 6 deletions(-)

Reviewed-by: Peter Maydell <address@hidden>

though I'm not much of a fan of yet another global variable :-(

thanks
-- PMM