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Message-ID: <165106776778.4207.11312672097188195289.tip-bot2@tip-bot2>
Date: Wed, 27 Apr 2022 13:56:07 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
"Peter Zijlstra (Intel)" <peterz@...radead.org>,
"Paul E. McKenney" <paulmck@...nel.org>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject: [tip: x86/cleanups] x86/aperfmperf: Store aperf/mperf data for cpu
frequency reads
The following commit has been merged into the x86/cleanups branch of tip:
Commit-ID: 3b1fc17f635164d74934f67d3bb46cdf877fb67f
Gitweb: https://git.kernel.org/tip/3b1fc17f635164d74934f67d3bb46cdf877fb67f
Author: Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Fri, 15 Apr 2022 21:20:01 +02:00
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 27 Apr 2022 15:51:08 +02:00
x86/aperfmperf: Store aperf/mperf data for cpu frequency reads
Now that the MSR readout is unconditional, store the results in the per CPU
data structure along with a jiffies timestamp for the CPU frequency readout
code.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Paul E. McKenney <paulmck@...nel.org>
Link: https://lore.kernel.org/r/20220415161206.817702355@linutronix.de
---
arch/x86/kernel/cpu/aperfmperf.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/aperfmperf.c b/arch/x86/kernel/cpu/aperfmperf.c
index df528a4..963c069 100644
--- a/arch/x86/kernel/cpu/aperfmperf.c
+++ b/arch/x86/kernel/cpu/aperfmperf.c
@@ -24,11 +24,17 @@
#include "cpu.h"
struct aperfmperf {
+ seqcount_t seq;
+ unsigned long last_update;
+ u64 acnt;
+ u64 mcnt;
u64 aperf;
u64 mperf;
};
-static DEFINE_PER_CPU_SHARED_ALIGNED(struct aperfmperf, cpu_samples);
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct aperfmperf, cpu_samples) = {
+ .seq = SEQCNT_ZERO(cpu_samples.seq)
+};
struct aperfmperf_sample {
unsigned int khz;
@@ -515,6 +521,12 @@ void arch_scale_freq_tick(void)
s->aperf = aperf;
s->mperf = mperf;
+ raw_write_seqcount_begin(&s->seq);
+ s->last_update = jiffies;
+ s->acnt = acnt;
+ s->mcnt = mcnt;
+ raw_write_seqcount_end(&s->seq);
+
scale_freq_tick(acnt, mcnt);
}
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