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Re: [PATCH] s390x: sigp: Fix sense running reporting

From: David Hildenbrand
Subject: Re: [PATCH] s390x: sigp: Fix sense running reporting
Date: Fri, 24 Jan 2020 14:15:26 +0100
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


David / dhildenb

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