From: Olaf Hering <olaf@aepfle.de>
To: George Dunlap <george.dunlap@cloud.com>
Cc: Jan Beulich <jbeulich@suse.com>,
xen-devel@lists.xenproject.org, Juergen Gross <jgross@suse.com>,
George Dunlap <george.dunlap@citrix.com>
Subject: Re: xentrace buffer size, maxcpus and online cpus
Date: Fri, 16 Jun 2023 17:37:17 +0200 [thread overview]
Message-ID: <20230616173717.3f264151.olaf@aepfle.de> (raw)
In-Reply-To: <CA+zSX=Y6yrkA0RM0FAM7Cjv2f-UP8FvMUsoRXbMAxP+fNNC79g@mail.gmail.com>
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Fri, 16 Jun 2023 15:22:24 +0100 George Dunlap <george.dunlap@cloud.com>:
> 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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next prev parent reply other threads:[~2023-06-16 15:38 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-30 7:58 xentrace buffer size, maxcpus and online cpus Olaf Hering
2023-05-30 8:41 ` Jan Beulich
2023-05-30 20:06 ` Olaf Hering
2023-05-31 9:05 ` Jan Beulich
2023-06-16 11:47 ` Olaf Hering
2023-06-16 11:52 ` Jan Beulich
2023-06-16 14:22 ` George Dunlap
2023-06-16 15:37 ` Olaf Hering [this message]
2023-06-16 16:08 ` Andrew Cooper
2023-06-19 10:16 ` Olaf Hering
2023-06-19 11:14 ` Andrew Cooper
2023-06-19 10:13 ` Olaf Hering
2023-06-19 10:22 ` Jan Beulich
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