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Re: [Qemu-devel] [PATCH v6 18/19] target-arm: don't generate WFE/YIELD c

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v6 18/19] target-arm: don't generate WFE/YIELD calls for MTTCG
Date: Thu, 10 Nov 2016 18:59:03 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 11/09/2016 03:57 PM, Alex Bennée 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>
 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: Richard Henderson <address@hidden>


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