** Tags added: kernel-daily-bug
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Title:
perf c2c record is not working
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Thank you for following up Ody.
Last night I was going through the upstream perf code, and I think I
found the issue. I suspect it has to do with the commits from the LWN
article. I will try to verify today or possibly tomorrow, and update
with any progress.
In the meantime, you can try using
Hi Philip,
Thank you for your prompt response.
I'm experiencing the same error on Jammy with an `i5-12600K`.
I have two systems: one running Jammy with an `i5-12600K` and another on
Noble with an `i5-12600`.
On both setups, `perf c2c record` produces the same error.
Previously, the `i5-12600`
Hi Ody, thank you for taking the time to open this bug report.
I would like to clarify something, just so I understand the issue you
are seeing.
On your system, you get an error when you run "perf c2c record ls". The
error seems to be having to do with the system having no e-cores, and
just p-co
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Philip Cox (philcox)
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https://bugs.launchpad.net/bugs/2077153
Title:
perf c2c record is not working
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Update:
This seems to be related on the perf c2c support for Alder Lake hybrid cpu
architecture.
I tried the exact same installation on an older intel cpu and perf c2c works
there.
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ht
My cpu is 12th Gen Intel(R) Core(TM) i5-12600 has only 6 performance
cores (cpu_core) and 0 efficiency cores (cpu_atom)
I can see the ldlat event tho also for cpu_atom
$ cat /sys/devices/cpu_core/events/mem-loads
event=0xcd,umask=0x1,ldlat=3
$ cat /sys/devices/cpu_atom/events/mem-loads
event=0xd
