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Re: xentrace buffer size, maxcpus and online cpus
- To: George Dunlap <george.dunlap@xxxxxxxxx>
- From: Olaf Hering <olaf@xxxxxxxxx>
- Date: Fri, 16 Jun 2023 17:37:17 +0200
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Juergen Gross <jgross@xxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>
- Delivery-date: Fri, 16 Jun 2023 15:37:48 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Fri, 16 Jun 2023 15:22:24 +0100 George Dunlap <george.dunlap@xxxxxxxxx>:
> I agree; the clear implication is that with smt=0, you might have
> num_online_cpus() return 4, but cpuids that look like {1, 3, 5, 7}; so you
> need the trace buffer array to be of size 8.
I see. Apparently some remapping is required to map a cpuid to an index
into the trace buffer metadata.
Olaf
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