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This is a reminder that gitlab.arm.com will be offline on Feb 5th.

Maintenance Activity

We will upgrade the gitlab production ( gitlab.arm.com) to version 15.8.0 . This will require Gitlab master and all mirrors to be offline.

When From Feb 5th(2:00AM UK, 9:00AM CHINA) to (11:00AM UK, 6:00PM CHINA).

  • linux-arm
  • linux-power
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Issue created Mar 01, 2021 by Ghost User@ghost

Possible Bug on find_energy_efficient_cpu.

Hi guys!

I was studying your code about EAS on CFS and I saw something that made me thinking.

In your code in fair.c ::find_energy_efficient_cpu() at line 6293 there is this instruction:

base_energy_pd = compute_energy(p, -1, pd);

So in base_energy_pd there is the energy consumed by the core without p.

After this there is at line 6317

prev_delta = compute_energy(p, prev_cpu, pd);

That compute the energy with p on core prev_cpu.

My question is: Is safe do this operation without checking that OPP is the same? Could p on prev_cpu rising the OPP of the entire pd?

Thanks a lot!

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