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intel_pstate: remove unneeded sample buffers
Remove unneeded sample buffers, intel_pstate operates on the most recent sample only. This save some memory and make the code more readable. Signed-off-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -99,8 +99,7 @@ struct cpudata {
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u64 prev_aperf;
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u64 prev_mperf;
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unsigned long long prev_tsc;
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int sample_ptr;
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struct sample samples[SAMPLE_COUNT];
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struct sample sample;
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};
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static struct cpudata **all_cpu_data;
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@ -586,15 +585,14 @@ static inline void intel_pstate_sample(struct cpudata *cpu)
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mperf = mperf >> FRAC_BITS;
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tsc = tsc >> FRAC_BITS;
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cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT;
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cpu->samples[cpu->sample_ptr].aperf = aperf;
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cpu->samples[cpu->sample_ptr].mperf = mperf;
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cpu->samples[cpu->sample_ptr].tsc = tsc;
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cpu->samples[cpu->sample_ptr].aperf -= cpu->prev_aperf;
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cpu->samples[cpu->sample_ptr].mperf -= cpu->prev_mperf;
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cpu->samples[cpu->sample_ptr].tsc -= cpu->prev_tsc;
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cpu->sample.aperf = aperf;
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cpu->sample.mperf = mperf;
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cpu->sample.tsc = tsc;
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cpu->sample.aperf -= cpu->prev_aperf;
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cpu->sample.mperf -= cpu->prev_mperf;
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cpu->sample.tsc -= cpu->prev_tsc;
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intel_pstate_calc_busy(cpu, &cpu->samples[cpu->sample_ptr]);
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intel_pstate_calc_busy(cpu, &cpu->sample);
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cpu->prev_aperf = aperf;
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cpu->prev_mperf = mperf;
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@ -614,7 +612,7 @@ static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
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{
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int32_t core_busy, max_pstate, current_pstate;
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core_busy = cpu->samples[cpu->sample_ptr].core_pct_busy;
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core_busy = cpu->sample.core_pct_busy;
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max_pstate = int_tofp(cpu->pstate.max_pstate);
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current_pstate = int_tofp(cpu->pstate.current_pstate);
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core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
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@ -648,7 +646,7 @@ static void intel_pstate_timer_func(unsigned long __data)
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intel_pstate_sample(cpu);
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sample = &cpu->samples[cpu->sample_ptr];
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sample = &cpu->sample;
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intel_pstate_adjust_busy_pstate(cpu);
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@ -729,7 +727,7 @@ static unsigned int intel_pstate_get(unsigned int cpu_num)
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cpu = all_cpu_data[cpu_num];
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if (!cpu)
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return 0;
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sample = &cpu->samples[cpu->sample_ptr];
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sample = &cpu->sample;
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return sample->freq;
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}
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