AMD Per-Core Energy Counter Support Slated For Linux 6.14
The past few months AMD Linux engineers have been working on per-core energy counter support under the Linux Runtime Average Power Limiting (RAPL) infrastructure. After going through the v7 patches, they are now ready for the mainline Linux kernel once Linux 6.14 rolls around with its merge window in late January / early February.
The AMD per-core energy counter patch series explains:
"Currently the energy-cores event in the power PMU aggregates energy consumption data at a package level. On the other hand the core energy RAPL counter in AMD CPUs has a core scope (which means the energy consumption is recorded separately for each core). Earlier efforts to add the core event in the power PMU had failed [1], due to the difference in the scope of these two events. Hence, there is a need for a new core scope PMU.
This patchset adds a new "power_core" PMU alongside the existing "power" PMU, which will be responsible for collecting the new "energy-core" event.
Tested the package level and core level PMU counters with workloads pinned to different CPUs."
As of this morning, the patches were picked up by the tip/tip.git's perf/core branch.
With the patches now queued as part of the TIP branch and with two months to go until the Linux 6.14 cycle, it looks like the per-core energy counter support is ready to roll with that next kernel cycle. Linux 6.14 is also going to be exciting for AMD customers with the AMDXDNA driver ready for inclusion in supporting the Ryzen AI NPU on the mainline Linux kernel.
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