[PATCH v1] x86/sched: Print debug messages on hybrid asym capacity changes

["Rafael J. Wysocki" <rjw@rjwysocki.net>]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Subject: [PATCH v1] x86/sched: Print debug messages on hybrid asym capacity changes

Make arch_set_cpu_capacity() print a debug message including the
capacity and maximum frequency ratio used in scale-invariant utilization
computations for a given CPU and in capacity-aware scheduling (CAS) or
energy-aware scheduling (EAS).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 arch/x86/kernel/cpu/aperfmperf.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/x86/kernel/cpu/aperfmperf.c
+++ b/arch/x86/kernel/cpu/aperfmperf.c
@@ -416,6 +416,10 @@
 			   div_u64(cap << SCHED_CAPACITY_SHIFT, max_cap));
 		WRITE_ONCE(per_cpu_ptr(arch_cpu_scale, cpu)->freq_ratio,
 			   div_u64(cap_freq << SCHED_CAPACITY_SHIFT, base_freq));
+
+		pr_debug("CPU%d: capacity = %lu, freq_ratio = %lu\n", cpu,
+			 per_cpu_ptr(arch_cpu_scale, cpu)->capacity,
+			 per_cpu_ptr(arch_cpu_scale, cpu)->freq_ratio);
 	} else {
 		WARN_ONCE(1, "Hybrid CPU capacity scaling not enabled");
 	}