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Message-ID: <4664631.LvFx2qVVIh@rjwysocki.net>
Date: Wed, 09 Jul 2025 12:47:17 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: x86 Maintainers <x86@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org>,
Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>
Subject:
[PATCH v1] x86/sched: Print debug messages on hybrid asym capacity changes
From: Rafael J. Wysocki <rafael.j.wysocki@...el.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@...el.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");
}
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