diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2022-04-15 21:20:01 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2022-04-27 20:22:19 +0200 |
| commit | cd8c0e142daf9de9ce594e61b75509b0af7bfb26 (patch) | |
| tree | 7eb324208afbd0ffc895b75113a5ba1fc77fd294 | |
| parent | x86/aperfmperf: Make parts of the frequency invariance code unconditional (diff) | |
| download | linux-dev-cd8c0e142daf9de9ce594e61b75509b0af7bfb26.tar.xz linux-dev-cd8c0e142daf9de9ce594e61b75509b0af7bfb26.zip | |
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@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
| -rw-r--r-- | arch/x86/kernel/cpu/aperfmperf.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/aperfmperf.c b/arch/x86/kernel/cpu/aperfmperf.c index df528a4f6de3..963c0697a92b 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); } |