[Bug 2065141] Re: AMD CPU type 0x70f40 (ext family 0xa) unknown

[Sebastien Bacher]

** Changed in: rr (Ubuntu Noble)
       Status: In Progress => Fix Committed

** Changed in: rr (Ubuntu)
       Status: In Progress => Fix Committed

** Changed in: rr (Ubuntu Mantic)
       Status: In Progress => Fix Committed

** Changed in: rr (Ubuntu Jammy)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/2065141

Title:
  AMD CPU type 0x70f40 (ext family 0xa) unknown

Status in rr package in Ubuntu:
  Fix Released
Status in rr source package in Jammy:
  Fix Committed
Status in rr source package in Mantic:
  Fix Committed
Status in rr source package in Noble:
  Fix Committed

Bug description:
  [ Impact ]

  Running rr in Phonenix AMD APU (Ryzen 7840U) as in latest generation
  of AMD ThinkPad fails with

  [FATAL ./src/PerfCounters_x86.h:121:compute_cpu_microarch()] AMD CPU
  type 0x70f40 (ext family 0xa) unknown

  It was fixed upstream via https://github.com/rr-debugger/rr/pull/3645
  (related issue https://github.com/rr-debugger/rr/issues/3715)

  [ Test case ]

  With a such CPU run:
   rr record true

  It should record the process execution as expected, in case it may
  mention that some further tuning is required for Zen CPUs:

    On Zen CPUs, rr will not work reliably unless you disable the hardware 
    SpecLockMap optimization.
    For instructions on how to do this, see
    https://github.com/rr-debugger/rr/wiki/Zen

  [ Regression Potential ]

  Not really known since it's just adding a case for the CPU family.

  In theory it may make other CPUs of the same family not work in the
  same way.

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