linux-kernel - [patch 06/10] x86/aperfmperf: Restructure arch_scale_freq

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Date:   Fri, 15 Apr 2022 21:19:57 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-pm@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>
Subject: [patch 06/10] x86/aperfmperf: Restructure arch_scale_freq_tick()

Preparation for sharing code with the CPU frequency portion of the
aperf/mperf code.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/cpu/aperfmperf.c |   36 +++++++++++++++++++++---------------
 1 file changed, 21 insertions(+), 15 deletions(-)

--- a/arch/x86/kernel/cpu/aperfmperf.c
+++ b/arch/x86/kernel/cpu/aperfmperf.c
@@ -477,22 +477,9 @@ static DECLARE_WORK(disable_freq_invaria
 
 DEFINE_PER_CPU(unsigned long, arch_freq_scale) = SCHED_CAPACITY_SCALE;
 
-void arch_scale_freq_tick(void)
+static void scale_freq_tick(u64 acnt, u64 mcnt)
 {
-	struct aperfmperf *s = this_cpu_ptr(&cpu_samples);
-	u64 aperf, mperf, acnt, mcnt, freq_scale;
-
-	if (!arch_scale_freq_invariant())
-		return;
-
-	rdmsrl(MSR_IA32_APERF, aperf);
-	rdmsrl(MSR_IA32_MPERF, mperf);
-
-	acnt = aperf - s->aperf;
-	mcnt = mperf - s->mperf;
-
-	s->aperf = aperf;
-	s->mperf = mperf;
+	u64 freq_scale;
 
 	if (check_shl_overflow(acnt, 2*SCHED_CAPACITY_SHIFT, &acnt))
 		goto error;
@@ -514,4 +501,23 @@ void arch_scale_freq_tick(void)
 	pr_warn("Scheduler frequency invariance went wobbly, disabling!\n");
 	schedule_work(&disable_freq_invariance_work);
 }
+
+void arch_scale_freq_tick(void)
+{
+	struct aperfmperf *s = this_cpu_ptr(&cpu_samples);
+	u64 acnt, mcnt, aperf, mperf;
+
+	if (!arch_scale_freq_invariant())
+		return;
+
+	rdmsrl(MSR_IA32_APERF, aperf);
+	rdmsrl(MSR_IA32_MPERF, mperf);
+	acnt = aperf - s->aperf;
+	mcnt = mperf - s->mperf;
+
+	s->aperf = aperf;
+	s->mperf = mperf;
+
+	scale_freq_tick(acnt, mcnt);
+}
 #endif /* CONFIG_X86_64 && CONFIG_SMP */