The Energy Aware Scheduler (EAS) estimates the energy consumption
of placing a task on different CPUs. The goal is to minimize this
energy consumption. Estimating the energy of different task placements
is increasingly complex with the size of the platform.

To avoid having a slow wake-up path, EAS is only enabled if this
complexity is low enough.

The current complexity limit was set in:

  b68a4c0d ("sched/topology: Disable EAS on inappropriate platforms")

... based on the first implementation of EAS, which was re-computing
the power of the whole platform for each task placement scenario, see:

  390031e4 ("sched/fair: Introduce an energy estimation helper function")

... but the complexity of EAS was reduced in:

  eb92692b ("sched/fair: Speed-up energy-aware wake-ups")

... and find_energy_efficient_cpu() (feec) algorithm was updated in:

  3e8c6c9a ("sched/fair: Remove task_util from effective utilization in feec()")

find_energy_efficient_cpu() (feec) is now doing:

	feec()
	\_ for_each_pd(pd) [0]
	  // get max_spare_cap_cpu and compute_prev_delta
	  \_ for_each_cpu(pd) [1]

	  \_ eenv_pd_busy_time(pd) [2]
		\_ for_each_cpu(pd)

	  // compute_energy(pd) without the task
	  \_ eenv_pd_max_util(pd, -1) [3.0]
	    \_ for_each_cpu(pd)
	  \_ em_cpu_energy(pd, -1)
	    \_ for_each_ps(pd)

	  // compute_energy(pd) with the task on prev_cpu
	  \_ eenv_pd_max_util(pd, prev_cpu) [3.1]
	    \_ for_each_cpu(pd)
	  \_ em_cpu_energy(pd, prev_cpu)
	    \_ for_each_ps(pd)

	  // compute_energy(pd) with the task on max_spare_cap_cpu
	  \_ eenv_pd_max_util(pd, max_spare_cap_cpu) [3.2]
	    \_ for_each_cpu(pd)
	  \_ em_cpu_energy(pd, max_spare_cap_cpu)
	    \_ for_each_ps(pd)

	[3.1] happens only once since prev_cpu is unique. With the same
	      definitions for nr_pd, nr_cpus and nr_ps, the complexity is of:

		nr_pd * (2 * [nr_cpus in pd] + 2 * ([nr_cpus in pd] + [nr_ps in pd]))
		+ ([nr_cpus in pd] + [nr_ps in pd])

		 [0]  * (     [1] + [2]      +       [3.0] + [3.2]                  )
		+ [3.1]

		= nr_pd * (4 * [nr_cpus in pd] + 2 * [nr_ps in pd])
		+ [nr_cpus in prev pd] + nr_ps

The complexity limit was set to 2048 in:

  b68a4c0d ("sched/topology: Disable EAS on inappropriate platforms")

... to make "EAS usable up to 16 CPUs with per-CPU DVFS and less than 8
performance states each". For the same platform, the complexity would
actually be of:

  16 * (4 + 2 * 7) + 1 + 7 = 296

Since the EAS complexity was greatly reduced since the limit was
introduced, bigger platforms can handle EAS.

For instance, a platform with 112 CPUs with 7 performance states
each would not reach it:

  112 * (4 + 2 * 7) + 1 + 7 = 2024

To reflect this improvement in the underlying EAS code, remove
the EAS complexity check.

Note that a limit on the number of CPUs still holds against
EM_MAX_NUM_CPUS to avoid overflows during the energy estimation.

[ mingo: Updates to the changelog. ]
Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Link: https://lore.kernel.org/r/20231009060037.170765-2-sshegde@linux.vnet.ibm.com