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Re: [Qemu-arm] [PATCH v12 21/24] target-arm: don't generate WFE/YIELD ca
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From: |
Pranith Kumar |
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Subject: |
Re: [Qemu-arm] [PATCH v12 21/24] target-arm: don't generate WFE/YIELD calls for MTTCG |
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Date: |
Fri, 17 Feb 2017 12:17:51 -0500 |
On Mon, Feb 13, 2017 at 7:10 AM, 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.
>
I think something similar needs to be done for 'pause' on x86.
--
Pranith