From: David Hildenbrand <david@redhat.com>
To: Janosch Frank <frankja@linux.ibm.com>, Cornelia Huck <cohuck@redhat.com>
Cc: qemu-s390x@nongnu.org, borntraeger@de.ibm.com, thuth@redhat.com,
qemu-devel@nongnu.org
Subject: Re: [PATCH] s390x: sigp: Fix sense running reporting
Date: Fri, 24 Jan 2020 14:15:26 +0100 [thread overview]
Message-ID: <e815e3ef-3580-6eef-b198-cb11fdf57e1c@redhat.com> (raw)
In-Reply-To: <c8310441-5104-6446-2399-840a127c56fd@linux.ibm.com>
> 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
prev parent reply other threads:[~2020-01-24 13:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-24 10:01 [PATCH] s390x: sigp: Fix sense running reporting Janosch Frank
2020-01-24 10:05 ` Cornelia Huck
2020-01-24 12:03 ` David Hildenbrand
2020-01-24 13:00 ` Janosch Frank
2020-01-24 13:01 ` Janosch Frank
2020-01-24 13:15 ` David Hildenbrand [this message]
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