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Commit fcb6a15c authored by Dirk Brandewie's avatar Dirk Brandewie Committed by Rafael J. Wysocki
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intel_pstate: Take core C0 time into account for core busy calculation 

Take non-idle time into account when calculating core busy time.
This ensures that intel_pstate will notice a decrease in load.

References: https://bugzilla.kernel.org/show_bug.cgi?id=66581


Cc: 3.10+ <stable@vger.kernel.org> # 3.10+
Signed-off-by: default avatarDirk Brandewie <dirk.j.brandewie@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 38dbfb59

drivers/cpufreq/intel_pstate.c

+17 −4
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ struct sample { 
	int32_t core_pct_busy;

	u64 aperf;

	u64 mperf;

	unsigned long long tsc;

	int freq;

};
@@ -96,6 +97,7 @@ struct cpudata { 


	u64	prev_aperf;

	u64	prev_mperf;

	unsigned long long prev_tsc;

	int	sample_ptr;

	struct sample samples[SAMPLE_COUNT];

};
@@ -548,30 +550,41 @@ static inline void intel_pstate_calc_busy(struct cpudata *cpu, 
					struct sample *sample)

{

	u64 core_pct;

	core_pct = div64_u64(int_tofp(sample->aperf * 100),

			     sample->mperf);

	sample->freq = fp_toint(cpu->pstate.max_pstate * core_pct * 1000);

	u64 c0_pct;



	sample->core_pct_busy = core_pct;

	core_pct = div64_u64(sample->aperf * 100, sample->mperf);



	c0_pct = div64_u64(sample->mperf * 100, sample->tsc);

	sample->freq = fp_toint(

		mul_fp(int_tofp(cpu->pstate.max_pstate),

			int_tofp(core_pct * 1000)));



	sample->core_pct_busy = mul_fp(int_tofp(core_pct),

				div_fp(int_tofp(c0_pct + 1), int_tofp(100)));

}



static inline void intel_pstate_sample(struct cpudata *cpu)

{

	u64 aperf, mperf;

	unsigned long long tsc;



	rdmsrl(MSR_IA32_APERF, aperf);

	rdmsrl(MSR_IA32_MPERF, mperf);

	tsc = native_read_tsc();



	cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT;

	cpu->samples[cpu->sample_ptr].aperf = aperf;

	cpu->samples[cpu->sample_ptr].mperf = mperf;

	cpu->samples[cpu->sample_ptr].tsc = tsc;

	cpu->samples[cpu->sample_ptr].aperf -= cpu->prev_aperf;

	cpu->samples[cpu->sample_ptr].mperf -= cpu->prev_mperf;

	cpu->samples[cpu->sample_ptr].tsc -= cpu->prev_tsc;



	intel_pstate_calc_busy(cpu, &cpu->samples[cpu->sample_ptr]);



	cpu->prev_aperf = aperf;

	cpu->prev_mperf = mperf;

	cpu->prev_tsc = tsc;

}



static inline void intel_pstate_set_sample_time(struct cpudata *cpu)