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Re: [Qemu-devel] [PATCH 0/2] Implement YIELD to yield in ARM and Thumb t
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] [PATCH 0/2] Implement YIELD to yield in ARM and Thumb translators |
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Date: |
Fri, 26 Jun 2015 15:28:37 +0100 |
On 26 June 2015 at 15:25, Paolo Bonzini <address@hidden> wrote:
>
>
> On 26/06/2015 16:04, Peter Maydell wrote:
>> Ping?
>
> Oh, YIELD was what I was thinking of in the thread about IPIs, not WFE
> (which would require SEV on the other core)...
Linux doesn't in practice put YIELD insns into its busy loops,
so this series is more of a completeness thing than an actual
attempt to solve the problem in the other thread.
I think the right fix for the other thread's problems is that
we should not allow any TCG CPU to run for an unbounded period
of time -- we should always switch to another CPU after some
period of time if the CPU hasn't ended up coming back out to
the top-level loop of its own accord. That's definitely post-2.4
material though.
-- PMM