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Re: [PATCH] s390x: sigp: Fix sense running reporting
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From: |
David Hildenbrand |
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Subject: |
Re: [PATCH] s390x: sigp: Fix sense running reporting |
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Date: |
Fri, 24 Jan 2020 14:15:26 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.3.1 |
> No idea.
> How many people use smp with tcg?
>
The kernel uses it (pcpu_running()) to decide whether
- To send an emergency call or an external call (external calls are
faster when the CPU is already running - e.g., SIE HW assist)
- In arch_vcpu_is_preempted(), for an heuristic
So nothing actually breaks (as I explained, only used for performance
optimizations)
--
Thanks,
David / dhildenb