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x86/aperfmperf: Store aperf/mperf data for cpu frequency reads

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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@linutronix.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/20220415161206.817702355@linutronix.de
This commit is contained in:
Thomas Gleixner 2022-04-15 21:20:01 +02:00
parent bb6e89df90
commit cd8c0e142d
1 changed files with 13 additions and 1 deletions
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14
arch/x86/kernel/cpu/aperfmperf.c
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@ -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);
}